JP2024109465A - Valve gear, assembly method of the same, and disassembly method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve gear which has high sealability and can be disassembled and assembled easily without using a special jig at a low price.

SOLUTION: A valve gear 1 includes: a valve box 2; a valve chamber 20 formed in the valve box 2; a valve body 10 housed in the valve chamber 20; a first fluid passage 3 communicating with the valve chamber 20; a second fluid passage 4 communicating with the valve chamber 20; a valve seat 30 provided at a communication port 22 communicating with the second fluid passage 4; a shaft part 11 protruding from the valve body 10; a support part 5 which supports the shaft part 11 and may be attached to or detached from the valve box 2 and the valve body 10; and a pressing part 6 which presses the support part 5 in a direction such that the valve body 10 moves close to the valve seat 30. The shaft part 11 has a first shaft 11A and a second shaft 11B protruding from the valve body 10. The support part 5 has a first support part 50 and a second support part 55. The pressing part 6 has a first pressing part 60 and a second pressing part 65 which press the first support part 50 and the second support part 55 in the direction such that the valve body 10 moves close to the valve seat 30.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a valve device, a method for assembling the valve device, and a method for disassembling the valve device.

Conventionally, various valve devices such as ball valves have been used to open and close fluid flow paths for various gases and liquids (also referred to as fluids). There are various types of valve devices, such as top-entry type, side-entry type, and bottom-entry type, and these are used depending on the application. Here, the top-entry type ball valve (for example, Patent Documents 1 and 2) is said to be capable of performing maintenance inside the valve box by removing the upper bonnet without removing the ball valve from the piping connected to the ball valve. In addition, since the top-entry type ball valve does not have a division part in the piping direction of the valve box, it is said to be superior to the side-entry type ball valve in terms of external leakage of fluid. Specifically, it is said that the side-entry type ball valve is concerned that the fluid may leak to the outside from the division part of the valve box due to the stress generated in the piping when the fluid flows through the fluid flow path. Furthermore, the side-entry type ball valve needs to be removed from the piping during maintenance, which is a problem that maintenance requires a lot of effort. Therefore, the top-entry type ball valve is mainly used in applications where external leakage of fluid is a problem or where maintenance at the installation site is required.

In ball valves such as those described above, the ball installed in the valve box may be removed during maintenance. In such cases, it is necessary to release the contact between the ball (including the sealing surface) and the valve seat. For this reason, the invention described in Patent Document 1 inserts a cylindrical insert between the ball and the valve seat during maintenance to push the valve seat forward and backward. In addition, the invention described in Patent Document 2 inserts an adjustment screw with a tapered portion at its tip from outside the valve box during maintenance, and the tapered portion retracts the seat ring retainer. As a result, the invention described in Patent Document 2 allows the ball to be removed from the valve box together with the seat ring.

Japanese Unexamined Patent Publication No. 63-266277 Publication number 4-32529

However, the invention described in Patent Document 1 requires a jig such as an insert piece during maintenance, and it is possible that the preparation of the insert piece may be forgotten or that the insert piece must be managed during maintenance. This raises concerns that the maintenance work may become cumbersome and that the cost of preparing the insert piece may increase. In addition, the invention described in Patent Document 2 requires that a screw hole for screwing in the adjustment screw be provided in the valve body, which raises concerns that fluid may leak to the outside from around the screw hole. Therefore, the invention described in Patent Document 2 requires that a separate seal be provided around the screw hole.

The present invention aims to provide a valve device that has high sealing properties and can be easily disassembled and assembled without special tools, as well as a method for assembling the valve device and a method for disassembling the valve device at low cost.

(1) The valve device of the present invention, which is provided to solve the above-mentioned problems, is characterized by having a valve box, a valve chamber formed inside the valve box, a valve disc accommodated inside the valve chamber, a first fluid flow path communicating with the valve chamber, a second fluid flow path communicating with the valve chamber, a valve seat provided at a communication port between the valve chamber and the second fluid flow path, a shaft portion provided to protrude from the valve disc, a support portion that supports the shaft portion and is detachable from the valve box and the valve disc, and a pressing portion that presses the valve disc against the support portion in a direction approaching the valve seat.

The valve device described above has a pressing portion that presses the support portion in a direction in which the valve element approaches the valve seat, so that the valve element can be pressed against the valve seat. As a result, the valve device described above can obtain stable sealing performance even when the fluid flowing between the first fluid flow path and the second fluid flow path is in a low pressure state. In addition, in the valve device described above, when the pressure on the pressing portion side (upstream side) increases, the fluid pressure of the fluid presses the valve element toward the valve seat, so that the sealing performance is further improved. In addition, in the valve device described above, the valve element and the support portion can be easily removed from the valve chamber by releasing the pressing by the pressing portion. Specifically, the valve element is pressed against the valve seat by the pressing of the pressing portion, so that the state in which the valve element is pressed against the valve seat is released by releasing the pressing of the pressing portion, and a gap can be formed between the valve element and the valve seat. As a result, the valve element and the support portion can be easily removed from the valve box. On the other hand, when assembling the valve device, the valve element and the support portion can be easily assembled by incorporating the valve element and the support portion into the valve chamber while releasing the pressing of the pressing portion.

The pressing force exerted by the pressing portion can be changed as appropriate depending on the application of the valve device and the type of valve device. The pressing portion can utilize various mechanisms (e.g., elastic bodies such as spring members) that can press the support portion in a direction in which the valve body approaches the valve seat. The support portion can preferably utilize a bearing (e.g., a sliding bearing, a ball bearing, or a roller bearing) that is detachable from the valve body. The valve device can be used for a rotary valve such as a ball valve.

In addition, the above-mentioned valve device is configured so that the support portion is pressed in the direction in which the valve body approaches the valve seat, so the valve seat can be configured to be provided only on the second fluid flow path side (downstream side) of the valve body. This makes it possible to eliminate the need for a seal (seat) provided on the upstream side of the valve body, simplifying the configuration and reducing costs.

(2) The valve device of the present invention described above may be characterized in that the support portion is a bearing that rotatably supports the shaft portion, the valve body is ball-shaped, and can open and close the communication port by rotating while in contact with the valve seat.

The above-mentioned valve device has a support portion configured as a bearing, so maintenance can be performed easily and inexpensively. Here, various types of bearings can be used, such as a plain bearing, a ball bearing, or a roller bearing. In addition, the above-mentioned valve device is formed as a so-called ball valve, in which the valve body is ball-shaped, so maintenance can be performed easily and inexpensively.

(3) In the valve device of the present invention described above, the shaft portion includes a first shaft provided so as to protrude from the valve body, and a second shaft provided so as to protrude from the valve body on an opposite side to the first shaft;
the support portion has a first support portion supporting the first shaft and a second support portion supporting the second shaft, and the pressing portion has a first pressing portion pressing the first support portion in a direction in which the valve body approaches the valve seat, and a second pressing portion pressing the second support portion in a direction in which the valve body approaches the valve seat.

In the above-mentioned valve device, the valve body is rotatably supported by a first shaft and a second shaft that protrudes from the valve body on the opposite side to the first shaft, so that the valve body can be stably rotated. Furthermore, in the above-mentioned valve device, the first support portion and the second support portion are pressed in a direction in which the valve body approaches the valve seat by the first pressing portion and the second pressing portion, respectively, so that sealing performance is improved even when the fluid is at low pressure. Furthermore, the above-mentioned valve device does not require a sealing sheet on the first fluid flow path side (upstream side) of the valve body, so a cost reduction effect can be expected.

(4) The valve device of the present invention described above may be characterized in that it comprises a second shaft side chamfer formed in a tapered or rounded shape on the tip side of the second shaft, and a second support part side chamfer formed in a tapered or rounded shape around the upper end opening of the second support part, and when the second shaft is fitted into the second support part, the second shaft side chamfer comes into contact with the second support part side chamfer to press the second support part in a direction away from the valve seat against the pressing force of the second pressing part.

By configuring the valve device as described above, the force applied when the second shaft is attached to the second support part can be converted into a force in a direction that moves the second support part away from the valve seat. In other words, the valve device described above can avoid interference between the valve body and the valve seat when the second shaft is attached to the second support part. This reduces the resistance when the second shaft is attached to the second support part, making it easier to install the valve body in the valve chamber.

(5) In the valve device of the present invention described above, the first pressing portion has at least one first hole portion formed on the first fluid flow path side of the first support portion and at least one first spring member housed in the first hole portion, the second pressing portion has at least one second hole portion formed on the first fluid flow path side of the second support portion and at least one second spring member housed in the second hole portion, and a wall portion is provided around the communication port from the valve chamber to the first fluid flow path so as to face the opening ends of the first hole portion and the second hole portion, and one end side of the first spring member and the second spring member is configured to be able to abut against the wall portion.

The valve device described above can press the first support portion and the second support portion by the biasing force of the first spring member and the second spring member. In other words, the valve body is pressed against the valve seat by the biasing force of the first spring member and the second spring member. Therefore, the valve device described above can obtain stable sealing performance even when the fluid pressure of the fluid is low. In addition, the valve device described above can eliminate the seat on the upstream side of the valve body, and the first pressing portion and the second pressing portion can be simply configured, thereby reducing costs. In addition, the valve device described above can be easily disassembled and assembled by releasing the biasing force of the first spring member and the second spring member.

(6) In the valve device of the present invention described above, the first pressing portion may have an insertion hole portion that communicates with the bottom of the first hole portion and is formed with an opening in a direction intersecting the first hole portion, and a spherical member that is housed on the insertion hole portion side of the first hole portion and has a spherical surface facing the insertion hole portion side, and the insertion hole portion has at least a part of the spherical surface of the spherical member protruding into the interior and an insertion member can be inserted, and when the insertion member is inserted into the insertion hole portion, the insertion member and the spherical surface come into contact with each other, and the first spring member is compressed via the spherical member.

In the above-mentioned valve device, the insertion member can be inserted into the insertion hole to bring the insertion member into contact with the spherical surface of the spherical member. In addition, the abutment of the insertion member and the spherical member compresses the first spring member. In other words, when the insertion member is not inserted into the insertion hole, the pressing force of the first spring member is released, and when the insertion member is inserted into the insertion hole, the first spring member is pressed against the opposing wall and compressed, generating a pressing force. Therefore, in the above-mentioned valve device, the first support part can be attached to the first shaft with the pressing force of the first spring member released, and the pressing force of the first spring member can be applied after the valve body is incorporated into the valve chamber. In this way, the above-mentioned valve device can release the pressing force of the first support part when removing the valve body from the valve chamber or incorporating the valve body into the valve chamber, making maintenance work easy. On the other hand, after the valve body is incorporated into the valve chamber, the pressing force of the first support part can be applied, thereby improving the sealing performance of the valve device. Here, the insertion member can be of various types, such as a pin or rod-shaped member that can abut against the spherical surface of the spherical member. It is preferable that the insertion member be capable of maintaining and switching between an abutting state and a non-abutting state with the spherical member.

(7) The valve device of the present invention described above may be characterized in that the insertion member has a tapered or rounded insertion tip.

By configuring the valve device as described above, the force acting in the insertion direction of the insertion member can be converted into a force acting in the compression direction of the first spring member. Therefore, the valve device described above can reliably compress the first spring member. This reliably reduces the load acting on the first support portion during assembly, making assembly even easier.

(8) The valve device of the present invention described above may be characterized in that a thread groove is formed in the insertion hole portion, and the insertion member is formed as a screw and is screwed into the insertion hole portion as it is screwed into the thread groove.

The above-mentioned valve device, by being configured in this way, can easily switch between an abutting state and a non-abutting state between the insertion member and the spherical member. Furthermore, the above-mentioned valve device can incorporate the valve body into the valve chamber while maintaining a state in which the load on the first support portion is reduced. This makes it even easier to assemble the above-mentioned valve device.

(9) The valve device of the present invention described above may be characterized in that the spherical member is formed in a bullet shape.

By configuring the valve device as described above, the first spring member can be compressed along the axial direction (compression direction) of the first spring member. This allows the valve device described above to suppress deformation and damage to the first spring member.

(10) The valve device of the present invention described above may be characterized as being either a top entry type, a bottom entry type, or a side entry type.

The above-mentioned valve device can be preferably used for top entry, bottom entry, or side entry types.

(11) The valve device of the present invention described above may be characterized in that the first spring members and the second spring members are each provided in multiples and are arranged symmetrically in the vertical direction and the horizontal direction.

By configuring the valve device as described above, the biasing force of the first spring member and the second spring member can be made uniform in the vertical and horizontal directions. As a result, the valve device described above can press the valve body evenly against the valve seat, improving sealing performance.

(12) In the valve device of the present invention described above, the shaft portion is formed separately from the valve rod and has a shaft side connection portion for connecting to the valve rod at one end, the valve rod has a valve rod side connection portion facing the shaft side connection portion at one end, a concave portion is formed in one of the shaft side connection portion and the valve rod side connection portion, and a convex portion that can engage with the concave portion is formed in the other of the shaft side connection portion and the valve rod side connection portion, the shaft portion and the valve rod can rotate together by engaging the concave portion and the convex portion with each other, and the concave portion is formed so that the valve body can move in a direction along the first fluid flow path and the second fluid flow path when the first fluid flow path and the second fluid flow path are closed by the valve body.

In the valve device described above, the shaft portion is formed separately from the valve rod, so that the shaft portion can be separated from the valve rod during maintenance. This makes maintenance easy. In addition, in the valve device described above, a concave portion is formed in either the shaft side connection portion or the valve rod side connection portion, and the concave portion is formed so that the valve body can move in a direction along the first fluid flow path and the second fluid flow path when the first fluid flow path and the second fluid flow path are closed. In other words, the movement of the valve body in a direction along the first fluid flow path and the second fluid flow path is not restricted. Therefore, when the support portion is pressed by the pressing portion or when the pressure of the fluid is applied to the valve body, the surface pressure of the valve body against the valve seat can be increased. This allows the valve device described above to have improved sealing properties.

(13) The contact surface of the insertion member with the spherical member is formed in a tapered or rounded shape, and the amount of compression of the first spring member can be adjusted by adjusting the insertion depth of the insertion member into the insertion hole.

The above-mentioned valve device, with such a configuration, can adjust the compression amount of the first spring member and the second spring member evenly, and can equalize the vertical and horizontal pressing forces. This allows the valve body to be evenly pressed against the valve seat, improving sealing performance. In addition, the inclination of the first and second axes can be corrected, and the axis portion can be positioned in the same straight line as the valve rod, making assembly easier.

(14) The method of assembling the valve device of the present invention, which is provided to solve the above-mentioned problems, is the method of assembling the valve device described above, characterized in that it sequentially performs the following steps: a second support part arrangement step of arranging the second support part at the tip side of the second shaft in the insertion direction of the valve chamber; a second support part attachment step of inserting the second shaft into the second support part to separate the second support part from the valve seat and attach the second support part to the second shaft while avoiding interference between the valve body and the valve seat; a first support part attachment step of attaching the first support part to the first shaft of the valve body while releasing the pressing force of the first pressing part; and a first pressing part pressing force application step of applying a pressing force of the first pressing part.

In the above-mentioned method of assembling the valve device, the second support part can be separated from the valve seat by inserting the second shaft into the second support part, so that the second support part can be attached to the second shaft while releasing the contact between the valve body and the valve seat. Furthermore, in the first support part attachment step, the first support part can be attached to the first shaft with the pressing force of the first pressing part released, so that the first support part can be smoothly incorporated into the valve chamber. Furthermore, after the valve body is incorporated into the valve chamber, a pressing force is applied by the first pressing part in the first pressing part pressing force application step, so that the sealing performance of the valve device is improved.

(15) The method for disassembling the valve device of the present invention, which is provided to solve the above-mentioned problems, is a method for disassembling the valve device described above, characterized in that it sequentially performs a first pressing portion pressing force releasing step of releasing the pressing force of the first pressing portion, a first support portion removing step of removing the first shaft of the valve body from the first support portion while the pressing force of the first pressing portion is released, a second shaft removing step of removing the second shaft from the second support portion while moving the second support portion away from the valve seat, and a second support portion removing step of removing the second support portion from inside the valve chamber.

The above-mentioned method of disassembling the valve device allows the first shaft to be removed from the first support part with the pressing force of the first pressing part released through the first pressing part pressing force release step, making it easy to remove the first support part. Furthermore, with the above-mentioned valve device, with the first pressing part removed, the second shaft can be removed from the second support part and the second support part can be taken out of the valve chamber. Therefore, the above-mentioned method of disassembling the valve device allows the valve device to be easily disassembled, making maintenance easy to perform.

The present invention provides a valve device and a method for assembling the valve device at low cost that has high sealing properties and can be easily disassembled and assembled without special tools.

1 is a side cross-sectional view of a valve device according to an embodiment of the present invention; 2 is a cross-sectional view taken along the line AA in FIG. 1. FIG. 2 is a plan view of the state in which the bonnet of FIG. 1 is removed. 5A to 5C are explanatory diagrams of a method of assembling a valve device according to one embodiment of the present invention. 5(d) and (e) are explanatory diagrams continuing from FIG. 4. 10 is a partially enlarged view showing a modified example of the first pressing portion constituting the valve device of the present invention. FIG.

The valve device 1 according to one embodiment of the present invention will be described in detail below with reference to Figures 1 to 5. Note that these figures are schematic diagrams and are not necessarily drawn to scale. Note that similar components in the figures are given similar reference numerals. In this embodiment, a floating top-entry ball valve is used as the valve device 1. In the following, the right side of Figure 1 may be referred to as the upstream side of the fluid flow direction (also simply referred to as the upstream side), and the left side of Figure 1 may be referred to as the downstream side of the fluid flow direction (also simply referred to as the downstream side).

As shown in FIG. 1, the valve device 1 (also referred to as ball valve 1) includes a valve box 2, a valve body 10, a valve chamber 20, a first fluid flow path 3, a second fluid flow path 4, and a valve seat 30. In addition to the above, the valve device 1 includes an axis portion 11, a support portion 5, a pressing portion 6, and the like. In this embodiment, the axis portion 11 is divided into a first axis 11A and a second axis 11B via the valve body 10, and the support portion 5 is divided into a first support portion 50 and a second support portion 55 via the valve body 10. In this embodiment, the pressing portion 6 is also divided into a first pressing portion 60 and a second pressing portion 65 corresponding to the first support portion 50 and the second support portion 55.

The valve box 2 has a valve chamber 20, a first fluid flow path 3, a second fluid flow path 4, etc. formed inside. A bonnet 40 equipped with a valve stem 7 is removably attached to the top of the valve box 2. The bonnet 40 and the valve stem 7 will be described in detail later.

As shown in Figures 1 to 3, the valve chamber 20 is a space formed near the center of the valve box 2, and an opening 25 is formed on the upper side. The opening 25 is formed to a size that allows the valve body 10 to be removed, and can be accessed by removing the bonnet 40 from the valve box 2. In other words, maintenance work can be performed on the valve device 1 without removing it from the piping (not shown) connected to the valve device 1. The valve chamber 20 also accommodates the valve body 10 (ball 10 in this embodiment). In addition to the valve body 10, the valve chamber 20 also accommodates a first support portion 50 and a second support portion 55, as well as a first pressing portion 60 and a second pressing portion 65, which will be described later.

As shown in FIG. 1, the first fluid flow path 3 is located upstream of the valve chamber 20 (right side of FIG. 1) and is formed to extend horizontally. The first fluid flow path 3 allows various fluids such as liquids and gases to flow through. The first fluid flow path 3 also communicates with the valve chamber 20 via a communication port 21 on the upstream side. Therefore, the fluid that has flowed into the first fluid flow path 3 can flow into the valve chamber 20. The first fluid flow path 3 is formed to have approximately the same diameter as the valve body flow path 17 of the valve body 10 described later. In addition, a wall portion 23 is erected on the outer periphery of the communication port 21.

The second fluid flow path 4 is located downstream of the valve chamber 20 (left side in FIG. 1) and is formed to extend horizontally. The second fluid flow path 4 allows various fluids such as liquids and gases to flow through. The second fluid flow path 4 also communicates with the valve chamber 20 via a communication port 22 on the downstream side. Therefore, the fluid that has flowed into the valve chamber 20 can be discharged from the second fluid flow path 4. The second fluid flow path 4 is formed to have approximately the same diameter as the valve body flow path 17 described later.

A valve seat 30 is provided at the communication port 22 between the valve chamber 20 and the second fluid flow path 4. Specifically, the valve seat 30 is formed on the outer periphery of the communication port 22 and can abut against the seal surface 18 provided on the outer periphery of the valve body 10.

In this embodiment, the valve body 10 is formed with a ball-shaped outer shape (see Figures 2 and 3). The valve body 10 has a cylindrical valve body flow path 17 formed in the center. The valve body 10 is provided with a first axis 11A that protrudes in a direction intersecting the valve body flow path 17, and a second axis 11B that protrudes from the valve body 10 on the opposite side to the first axis 11A. The first axis 11A and the second axis 11B are rotatably supported by a first support portion 50 and a second support portion 55, respectively, which will be described later. Therefore, the valve body 10 can rotate about the first axis 11A and the second axis 11B.

The valve body flow path 17 can be brought into communication with the first fluid flow path 3 and the second fluid flow path 4 (also referred to as an open state) by rotating the valve body 10 so that it faces in a direction along the first fluid flow path 3 and the second fluid flow path 4. In addition, the valve body flow path 17 can be brought into a non-communicating state with the first fluid flow path 3 and the second fluid flow path 4 (also referred to as a closed state) by rotating the valve body 10 90 degrees from the communicating state. In other words, the valve body 10 can open and close the communication port 22 by rotating while in contact with the valve seat 30.

The valve body 10 also has an annular sealing surface 18 on its outer circumferential surface on the second fluid flow path 4 side (downstream side). The sealing surface 18 abuts against the valve seat 30 to prevent fluid from leaking between the valve chamber 20 and the second fluid flow path 4.

The bonnet 40 has a through hole 41 formed in the vertical direction in the center. The bonnet 40 is detachably attached to the valve box 2 by fastening a number of bolts 42 provided on the outer periphery of the through hole 41 to the valve box 2. The bonnet 40 closes the opening 25 in the valve chamber 20. A gasket 43 is provided at the boundary between the bonnet 40 and the valve box 2 to provide a tight seal.

The lower end of the through hole 41 communicates with the opening 25 of the valve box 2. The valve rod 7 is rotatably inserted through the through hole 41 via a bearing 44. The space between the valve rod 7 and the through hole 41 is sealed by a packing 45 or the like to prevent the fluid from leaking to the outside.

The upper end of the valve rod 7 protrudes from the through hole 41, and is connected to an appropriate drive motor or handle (not shown). Therefore, the valve rod 7 can be rotated by a drive motor or the like. The valve rod 7 also has a valve rod side connection part 70 at its lower end for connecting to the first shaft 11A.

The valve rod side connection part 70 is provided so as to face the shaft side connection part 12 (concave part 12) of the first shaft 11A described later. The valve rod side connection part 70 is provided with a convex part (hereinafter also referred to as convex part 70) that can engage with the concave part 12 (also referred to as shaft side connection part 12) of the first shaft 11A. The valve rod side connection part 70 connects the valve rod 7 and the first shaft 11A by engaging the convex part 70 with the concave part 12. Therefore, by rotating the valve rod 7, the first shaft 11A rotates integrally with the valve rod 7, and the valve body 10 rotates integrally with the first shaft 11A.

The first shaft 11A is provided on the upper end side of the valve body 10 and stands on the valve body 10 so as to protrude upward. The first shaft 11A has an axis side connection part 12 at one end side (upper end side) for connecting to the valve rod 7 described later. In addition, the lower end side (valve body 10 side) of the first shaft 11A is rotatably supported by the first support part 50 described later.

The shaft side connection part 12 has a concave portion (hereinafter also referred to as the concave portion 12) formed in a concave shape. The concave portion 12 is capable of engaging with the convex portion 70 of the valve rod 7 described later. Therefore, the first shaft 11A is connected to the valve rod 7 by the concave portion 12 engaging with the convex portion 70. Although details will be described later, the concave portion 12 is formed so that the valve body 10 can move in a direction along the first fluid flow path 3 and the second fluid flow path 4 when the first fluid flow path 3 and the second fluid flow path 4 are closed by the valve body 10.

The second shaft 11B is provided on the lower end side of the valve body 10 and is erected on the valve body 10 so as to protrude downward. The second shaft 11B is rotatably supported by the second support portion 55 described later. In this embodiment, the valve body 10 is supported rotatably above and below the valve body 10 by the first shaft 11A and the second shaft 11B, so that the valve body 10 can be stably rotated. The second shaft 11B has a second shaft chamfered portion 15 formed on the tip side. The second shaft chamfered portion 15 is formed in a tapered or rounded shape at the corner on the tip side of the second shaft 11B. The second shaft chamfered portion 15 can be formed, for example, by chamfering the tip of the second shaft 11B. The second shaft chamfered portion 15 is capable of abutting with the second support portion chamfered portion 56 of the second support portion 55 when the second support portion 55 is fitted to the second shaft 11B.

The first support portion 50 is detachable from the valve body 10. In this embodiment, the first support portion 50 is a bearing such as a plain bearing, a ball bearing, or a roller bearing. The first support portion 50 is fitted onto the outer periphery of the first shaft 11A. A first pressing portion 60, which will be described later, is provided on the first fluid flow path 3 side (upstream side) of the first support portion 50. The first support portion 50 is supported in contact with the wall portion 23 at the upper part of the valve chamber 20 by applying a pressing force from the first pressing portion 60. As a result, the first shaft 11A is rotatably supported by the first support portion 50. The portion where the first support portion 50 and the first shaft 11A slide may be appropriately hardened by plating, spraying, or overlaying, or coated with DLC, fluororesin, or the like. This is expected to suppress wear and galling of the first support portion 50 and the first shaft 11A.

The second support portion 55 is detachable from the valve chamber 20 (valve box 2) and the valve body 10. In this embodiment, the second support portion 55 is a bearing such as a plain bearing, a ball bearing, or a roller bearing. The second support portion 55 is fitted onto the outer periphery of the second shaft 11B. In addition, a second support portion chamfer 56 formed in a tapered or rounded shape is provided around the upper end opening of the second support portion 55.

When the second shaft 11B is fitted into the second support portion 55, the second shaft side chamfer 15 comes into contact with the second support portion side chamfer 56, thereby pressing the second support portion 55 in a direction away from the valve seat 30 against the pressing force of the second pressing portion 65 described below.

The valve device 1 described above can therefore convert the force exerted when the second shaft 11B is attached to the second support portion 55 into a force acting in a direction that moves the second support portion 55 away from the valve seat 30. In other words, the valve device 1 described above can avoid interference between the valve body 10 and the valve seat 30 when the second shaft 11B is attached to the second support portion 55. This allows the valve device 1 described above to reduce resistance when the second shaft 11B is attached to the second support portion 55, making it easier to install the valve body 10 in the valve chamber 20.

In addition, a second pressing portion 65, which will be described later, is provided on the first fluid flow path 3 side (upstream side) of the second support portion 55. The second support portion 55 is supported in contact with the wall portion 23 by applying a pressing force from the second pressing portion 65. This allows the second shaft 11B to be rotatably supported by the second support portion 55. The portion where the second support portion 55 and the second shaft 11B make sliding contact may be appropriately hardened by plating or spraying, or coated with DLC, fluororesin, or the like. This is expected to have the effect of suppressing wear and galling of the second support portion 55 and the second shaft 11B.

The first pressing portion 60 presses against the first support portion 50 in a direction in which the valve body 10 approaches the valve seat 30. In this embodiment, the first pressing portion 60 is formed integrally with the first support portion 50. The first pressing portion 60 is provided on the first fluid flow path 3 side (upstream side) of the first support portion 50. The first pressing portion 60 also has two first holes 61, 61 formed on the first fluid flow path 3 side of the first support portion 50, and first spring members 62, 62 housed in the first holes 61, 61.

The first holes 61, 61 are formed symmetrically with respect to the valve body 10 as shown in Figs. 2 and 3. The first holes 61, 61 are formed in a direction along the first fluid flow path 3 and the second fluid flow path 4 as shown in Fig. 1. The first holes 61, 61 are opened so that their opening ends face the wall portion 23 formed around the upstream communication port 21. The first holes 61, 61 are formed in a shape (in this embodiment, a circular hole) that can accommodate the first spring members 62, 62. Since the first holes 61, 61 and the first spring members 62, 62 are arranged symmetrically, the following will describe the first holes 61 and the first spring members 62 on one side, and will not describe the other side.

The first spring member 62 is formed, for example, of a coil spring, and is housed in the first hole portion 61. The first spring member 62 is formed to a length that fits within the first hole portion 61 in an uncompressed state. The first spring member 62 protrudes from the first hole portion 61 and abuts against the wall portion 23 by inserting an insertion member 68 (described later) into the insertion hole portion 63. As a result, the first support portion 50 is urged (pressed) by the first spring member 62 in a direction in which the valve body 10 approaches the valve seat 30.

The first pressing portion 60 also has an insertion hole portion 63 that communicates with the bottom of the first hole portion 61 and is formed with an opening in a direction intersecting the first hole portion 61, and a spherical member 64 (a sphere in this embodiment) that is housed on the insertion hole portion 63 side (downstream side) of the first hole portion 61 and has a spherical surface facing the insertion hole portion 63 side.

The insertion hole 63 has at least a portion of the spherical surface of the spherical member 64 protruding into it, and is capable of receiving the insertion member 68. In this embodiment, the insertion hole 63 is formed as a screw hole. In other words, the insertion hole 63 has a screw groove formed therein.

The spherical member 64 is, for example, a metal sphere. The spherical member 64 is accommodated on the bottom side (downstream side) of the first hole portion 61. Furthermore, a first spring member 62 is accommodated on the upstream side of the spherical member 64 in the first hole portion 61 so as to abut against the spherical member 64. The spherical member 64 can be pressed from the bottom side to urge the first spring member 62 toward the opening end side (upstream side) of the first hole portion 61.

In this embodiment, the insertion member 68 is formed as a screw and can be screwed into the thread groove of the insertion hole portion 63. In this embodiment, the insertion tip side of the insertion member 68 is formed in a tapered shape. The insertion member 68 can be screwed into the inside of the insertion hole portion 63 by screwing it into the thread groove of the insertion hole portion 63. In addition, the insertion member 68 and the spherical surface of the spherical member 64 come into contact with each other as the insertion member 68 is inserted (threaded) into the insertion hole portion 63. In addition, as the insertion member 68 is inserted, the first spring member 62 is compressed via the spherical member 64. As a result, one end side of the first spring member 62 comes into contact with the wall portion 23 on the first fluid flow path 3 side (upstream side), and the first support portion 50 is pressed by the first spring member 62. In addition, the first shaft 11A is supported rotatably by the first support portion 50.

In this way, the above-mentioned valve device 1 can make the insertion member 68 and the spherical surface of the spherical member 64 come into contact with each other by inserting the insertion member 68 into the insertion hole portion 63. In addition, the abutment of the insertion member 68 and the spherical member 64 compresses the first spring member 62. In other words, when the insertion member 68 is not inserted into the insertion hole portion 63, the pressing force of the first spring member 62 is released, and when the insertion member 68 is inserted into the insertion hole portion 63, the first spring member 62 is pressed against the opposing wall portion 23 and compressed, generating a pressing force. Therefore, in the above-mentioned valve device 1, the first support portion 50 can be attached to the first shaft 11A with the pressing force of the first spring member 62 released, and the pressing force of the first spring member 62 can be applied after the valve body 10 is assembled into the valve chamber 20.

In addition, by forming a threaded groove in the insertion hole 63 and screwing the insertion member 68 into the insertion hole 63, the above-mentioned valve device 1 can easily switch between an abutting state and a non-abutting state between the insertion member 68 and the spherical member 64. In addition, the above-mentioned valve device 1 can incorporate the valve body 10 into the valve chamber 20 while maintaining a state in which the load on the first support portion 50 is reduced. This makes it even easier to assemble the above-mentioned valve device 1.

In addition, the above-described valve device 1 can easily perform maintenance work because the pressing force of the first support part 50 can be released when removing the valve body 10 from the valve chamber 20 or when installing the valve body 10 in the valve chamber 20. On the other hand, after installing the valve body 10 in the valve chamber 20, the pressing force of the first support part 50 can be applied, so the sealing performance of the valve device 1 can be improved.

As described above, the insertion member 68 is tapered at the insertion tip side. Therefore, the insertion member 68 can convert the force applied in the insertion direction into a force in the compression direction of the first spring member 62. Therefore, the above-mentioned valve device 1 can reliably compress the first spring member 62 by inserting the insertion member 68 into the insertion hole portion 63. As a result, the above-mentioned valve device 1 can reliably reduce the load applied to the first support portion 50 during assembly, making assembly even easier.

The second pressing portion 65 presses against the second support portion 55 in the direction in which the valve body 10 approaches the valve seat 30. In this embodiment, the second pressing portion 65 is formed integrally with the second support portion 55. The second pressing portion 65 is provided on the first fluid flow path 3 side (upstream side) of the second support portion 55. As shown in Figures 2 and 3, the second pressing portion 65 has two second holes 66, 66 formed on the first fluid flow path 3 side of the second support portion 55, and second spring members 67, 67 housed in the second holes 66, 66.

As shown in FIG. 2, the second holes 66, 66 are formed so as to be symmetrical with respect to the valve body 10, and are formed so as to be symmetrical with respect to the first holes 61, 61. Also, as shown in FIG. 1, the second holes 66, 66 are formed in a direction along the first fluid flow path 3 and the second fluid flow path 4. The second holes 66, 66 are open so that their opening ends face the wall portion 23 formed around the upstream communication port 21. Also, the second holes 66, 66 are formed in a shape (in this embodiment, a circular hole) that can accommodate the second spring members 67, 67. Note that the second holes 66, 66 and the second spring members 67, 67 are arranged symmetrically, so the following will describe the second holes 66 and the second spring members 67 on one side, and will omit a description of the other side.

The second spring member 67 is formed of, for example, a coil spring, and is housed in the second hole portion 66. A portion of the second spring member 67 protrudes from the second hole portion 66 in a non-compressed state. Therefore, the second spring member 67 can abut against the wall portion 23 when the valve body 10 is housed in the valve chamber 20. As a result, the second support portion 55 is urged (pressed) by the second spring member 67 in a direction in which the valve body 10 approaches the valve seat 30.

As described above, the first spring members 62, 62 and the second spring members 67, 67 are arranged symmetrically in the vertical and horizontal directions. Therefore, the valve device 1 described above can equalize the biasing forces of the first spring members 62, 62 and the second spring members 67, 67 in the vertical and horizontal directions. As a result, the valve device 1 described above can evenly press the valve body 10 against the valve seat 30, improving sealing performance. Note that the respective pressing forces of the first spring members 62, 62 and the second spring members 67, 67 can be appropriately changed depending on the valve device 1, but it is desirable to set them to be equal from the viewpoint of evenly pressing the valve body 10 against the valve seat 30.

In this way, the valve device 1 described above can press the first support portion 50 and the second support portion 55 by the biasing force of the first spring members 62, 62 and the second spring members 67, 67. In other words, the valve body 10 is pressed against the valve seat 30 by the biasing force of the first spring members 62, 62 and the second spring members 67, 67. Therefore, the valve device 1 described above can obtain stable sealing even when the fluid pressure of the fluid is low. In addition, the valve device 1 described above can eliminate the seat on the upstream side of the valve body 10, and the first pressing portion 60 and the second pressing portion 65 can be simply configured, thereby reducing costs. In addition, the valve device 1 described above can be easily disassembled and assembled by releasing the biasing force of the first spring member 62 and the second spring member 67.

As described above, the valve device 1 has the shaft portion 11 (first shaft 11A) formed separately from the valve rod 7, so that the shaft portion 11 can be separated from the valve rod 7 during maintenance. This makes maintenance easy. In addition, the valve device 1 described above has a concave portion 12 formed in the shaft side connection portion 12, and the concave portion 12 is formed so that the valve body 10 can move in a direction along the first fluid flow path 3 and the second fluid flow path 4 when the first fluid flow path 3 and the second fluid flow path 4 are closed. In other words, the movement of the valve body in a direction along the first fluid flow path and the second fluid flow path is not restricted. Therefore, when the support portion 5 is pressed by the pressing portion 6 or when the pressure of the fluid is applied to the valve body 10, the surface pressure of the valve body 10 against the valve seat can be increased. As a result, the valve device 1 described above can improve the sealing performance.

The above is the configuration of the valve device 1 according to one embodiment of the present invention. Next, we will explain the effects of the valve device 1 of the present invention.

The valve device 1 described above has a pressing portion 6 (first pressing portion 60 and second pressing portion 65) that presses against the support portion 5 (first support portion 50 and second support portion 55) in the direction in which the valve body 10 approaches the valve seat 30, so that the valve body 10 can be pressed against the valve seat 30. As a result, the valve device 1 described above can obtain stable sealing performance even when the fluid flowing between the first fluid flow path 3 and the second fluid flow path 4 is in a low-pressure state. In addition, the valve device 1 described above has a further improved sealing performance because the valve body 10 is pressed toward the valve seat 30 by the fluid pressure of the fluid. In addition, when disassembling the valve device 1 described above, the valve body 10 and the support portion 5 can be easily removed from the valve chamber 20 by releasing the pressure from the pressing portion 6. Specifically, the valve body 10 is pressed against the valve seat 30 by the pressure of the pressing portion 6, so that by releasing the pressure of the pressing portion 6, the valve body 10 is released from the valve seat 30, and a gap is formed between the valve body 10 and the valve seat 30. This allows the valve body 10 and the support portion 5 to be easily removed from the valve chamber 20. On the other hand, when assembling the valve device 1, the valve body 10 and the support portion 5 can be easily assembled by inserting them into the valve chamber 20 while releasing the pressure of the pressing portion 6.

In addition, the above-mentioned valve device 1 is configured such that the support portion 5 is pressed in a direction in which the valve body 10 approaches the valve seat 30, so that the valve seat 30 can be configured to be provided only on the second fluid flow path 4 side (downstream side) of the valve body 10. As a result, the above-mentioned valve device 1 can eliminate the need for a seal (seal surface 18) provided on the upstream side of the valve body 10, simplifying the configuration and reducing costs.

The above-mentioned valve device 1 can be easily and inexpensively maintained by configuring the support portion 5 as a bearing that can be attached and detached from the valve body 10 and the valve box 2 (valve chamber 20). The above-mentioned valve device 1 can be easily and inexpensively maintained by forming the valve body 10 as a ball-shaped so-called ball valve 1.

The above is the configuration and effects of the valve device 1 according to one embodiment of the present invention. Next, the assembly method for one embodiment of the valve device 1 of the present invention will be described with reference to Figures 4 and 5.

As shown in FIG. 4(a), first, the second spring members 67, 67 are accommodated in the second holes 66, 66 of the second support portion 55. Next, with the second spring members 67, 67 accommodated, the second support portion 55 is positioned at the tip side of the valve body 10 in the valve chamber 20 in the insertion direction of the second shaft 11B (second support portion placement process).

As shown in FIG. 4(b), when the second shaft 11B is inserted (fitted) into the second support portion 55, the second shaft chamfer 15 abuts against the second support portion chamfer 56 while the second shaft 11B is fitted into the second support portion 55, so that the second support portion 55 is pressed against the wall portion 23 on the first fluid flow path 3 side (upstream side) against the pressing force of the second pressing portion 65. In other words, the vertical force is converted into a horizontal force.

At that time, the second support part 55 is attached to the second shaft 11B as shown in FIG. 4(c) in a state where the second support part 55 is separated from the valve seat 30 to avoid interference between the valve body 10 and the valve seat 30 (the second support part 55 is moved toward the upstream side) (second support part attachment process).

Next, as shown in FIG. 5(d), the pressing force of the first pressing portion 60 is released. That is, the first spring member 62 and the spherical member 64 are housed in the first hole portion 61, and the insertion member 68 is not inserted in the insertion hole portion 63. In this state, the first support portion 50 is attached to the first shaft 11A of the valve body 10 (first support portion attachment process).

5(e), the insert member 68 is inserted (screwed) into the insertion hole 63, and the first pressing part 60 applies a pressing force (first pressing part pressing force application process). As a result, the first spring member 62 is compressed and abuts against the wall 23, and the first support part 50 is pressed in a direction in which the valve body 10 approaches the valve seat 30. When the first pressing part pressing force application process is completed, the valve body 10 is subjected to uniform pressing forces in the vertical and horizontal directions by the first pressing part 60 and the second pressing part 65. After this, although not shown in the figure, the bonnet 40 is assembled on the valve box 2, and the assembly of the valve device 1 is completed. When the valve device 1 is to be disassembled for maintenance work, the steps of the above assembly are performed in reverse. For example, the following steps are performed to disassemble the valve device 1.

The disassembly method of the valve device 1 described above may be characterized by sequentially executing a first pressing part pressing force release step of releasing the pressing force of the first pressing part 60, a first support part removal step of removing the first shaft 11A of the valve body 10 from the first support part 50 while the pressing force of the first pressing part 60 is released, a second shaft removal step of removing the second shaft 11B from the second support part 55 while moving the second support part 55 away from the valve seat 30, and a second support part removal step of removing the second support part 55 from inside the valve chamber 20.

The above is a description of the assembly and disassembly method according to one embodiment of the valve device 1 of the present invention. Next, the effects of the assembly and disassembly method of the valve device 1 described above will be explained.

In the above-described assembly method of the valve device 1, the second support part 55 can be separated from the valve seat 30 by inserting the second shaft 11B into the second support part 55, so that the second support part 55 can be attached to the second shaft 11B while removing interference between the valve body 10 and the valve seat 30. In addition, in the first support part attachment process, the first support part 50 can be attached to the first shaft 11A with the pressing force of the first pressing part 60 released, so that the first support part 50 can be smoothly assembled into the valve chamber 20. In addition, after the valve body 10 is assembled into the valve chamber 20, the first pressing part 60 applies a pressing force in the first pressing part pressing force application process, improving the sealing performance of the valve device 1.

The above-described method of disassembling the valve device 1 allows the first shaft 11A to be removed from the first support part 50 with the pressing force of the first pressing part 60 released through the first pressing part pressing force release process, so that the first support part 50 can be easily removed from the valve chamber 20. Furthermore, with the above-described valve device 1, the second shaft 11B can be removed from the second support part 55 and the second support part 55 can be removed from the valve chamber 20 with the first pressing part 60 removed. Therefore, the above-described method of disassembling the valve device 1 allows the valve device 1 to be easily disassembled, and maintenance can be easily performed.

The above is the configuration and effects of the valve device 1, the method of assembling the valve device 1, and the method of disassembling the valve device 1 according to one embodiment of the present invention, but the valve device 1, the method of assembling the valve device 1, and the method of disassembling the valve device 1 of the present invention are not limited to the above embodiment and can be modified in various ways.

In this embodiment, the valve device 1 is exemplified as a top-entry type, but the present invention is not limited to this and can be used for various types of valve devices 1. For example, the valve device 1 may be configured as a bottom-entry type or a side-entry type. If the valve device 1 is a bottom-entry type, it can be used by being turned upside down from the top-entry type described above. If the valve device 1 is a side-entry type, it can be made accessible from the side of the valve body 10. In addition, each component of the valve device 1, such as the valve box 2, valve body 10, valve chamber 20, first fluid flow path 3, and second fluid flow path 4, can be formed in various shapes and sizes. In addition, the valve device 1 of the present invention is not limited to a ball valve 1 and can be used for various rotary type valve devices.

In this embodiment, the support part 5 (bearing) and the pressing part 6 are integrally formed, but the support part 5 and the pressing part 6 may be formed separately. This improves maintainability. In addition, in this embodiment, the valve seat 30 is integrally formed with the valve box 2, but the valve seat 30 may be configured to be detachable from the valve box 2 so as to be replaceable. In addition, in this embodiment, the pressing part 6 is formed of a spring member, but is not limited to this, and the pressing part 6 can use various mechanisms that can press the support part 5 in the direction in which the valve body 10 approaches the valve seat 30. In addition, the support part 5 can use various bearings such as a sliding bearing, a ball bearing, or a roller bearing that can be detached from the valve body 10.

In addition, in this embodiment, the shaft portion 11 is divided into the first shaft 11A and the second shaft 11B, but the shaft portion 11 does not have to be divided. For example, the valve device 1 may be formed of only the first shaft 11A. In such a case, the support portion 5 and the pressing portion 6 may also be formed as a single unit corresponding to the first shaft 11A.

In addition, in this embodiment, the first pressing portion 60 and the second pressing portion 65 exert a pressing force by the biasing force of the first spring member 62 and the second spring member 67, but the first pressing portion 60 and the second pressing portion 65 are not limited to this and pressing means of various mechanisms can be used. In addition, various means can be used as the pressing force release means in the first pressing portion 60. In addition, it is desirable to arrange the pressing force release means in the first pressing portion 60 so that it is located at the starting end side of the installation of the valve body 10 into the valve chamber 20 (in this embodiment, the first pressing portion 60 located on the upper side of the valve chamber 20) so that it can be released when the valve body 10 is installed in the valve chamber 20.

In this embodiment, the insertion tip side of the insertion member 68 is tapered, but the insertion member 68 can be formed in various shapes. For example, the insertion tip side of the insertion member 68 does not have to be tapered. In addition, the insertion member 68 can be formed as a screw, or various other members such as a pin or rod-shaped member that can abut against the spherical surface of the spherical member 64. It is preferable that the insertion member 68 be capable of maintaining and switching between an abutting state and a non-abutting state with the spherical member 64.

In addition, in this embodiment, the spherical member 64 is formed as a sphere, but as shown in FIG. 6, the spherical member 64 may be formed in a bullet shape. With this configuration, the valve device 1 described above can compress the first spring member 62 along the axial direction (compression direction) of the first spring member 62. As a result, the valve device 1 described above can suppress deformation and damage of the first spring member 62.

In addition, in this embodiment, the tip side of the insertion member 68 is formed in a cylindrical shape, but the tip of the insertion member 68 may be formed in a tapered or rounded shape, for example. With this configuration, the above-mentioned valve device 1 can adjust the compression amount of the first spring member 62 by adjusting the insertion depth of the insertion member 68 into the insertion hole portion 63. As a result, the above-mentioned valve device 1 can evenly adjust the compression amount of the first spring member 62 and the second spring member 67, and can equalize the vertical and horizontal pressing forces. Therefore, the valve body 10 can be evenly pressed against the valve seat 30, improving sealing performance. In addition, the inclination of the first axis 11A and the second axis 11B can be corrected, and the axis portion 11 can be arranged in the same straight line as the valve rod 7, making assembly easier.

In addition, in this embodiment, the pair of first spring members 62, 62 and the pair of second spring members 67, 67 are arranged symmetrically in the left-right direction and the top-bottom direction, respectively, but the present invention is not limited to this, and the first spring members 62 and the second spring members 67 can be arranged in various combinations and arrangements. Furthermore, the first spring members 62 and the second spring members 67 can be of various numbers, such as a single member or a multiple member of two or more members.

In addition, in this embodiment, the valve stem side connection portion 70 has a convex portion 70, and the shaft side connection portion 12 has a concave portion 12, but the convex portion 70 and the concave portion 12 may be provided in reverse. In addition, in this embodiment, the concave portion 12 is formed so that the valve body 10 can move in a direction along the first fluid flow path 3 and the second fluid flow path 4 when the first fluid flow path 3 and the second fluid flow path 4 are closed by the valve body 10, but the present invention is not limited to this. For example, the concave portion 12 may not move in a direction along the first fluid flow path 3 and the second fluid flow path 4 when the first fluid flow path 3 and the second fluid flow path 4 are closed by the valve body 10. Note that, from the viewpoint of improving sealing performance, it is desirable that the concave portion 12 moves in a direction along the first fluid flow path 3 and the second fluid flow path 4 when the first fluid flow path 3 and the second fluid flow path 4 are closed by the valve body 10. Furthermore, the connection between the valve stem 7 and the shaft portion 11 can be made by various means other than the convex portion 70 and the concave portion 12.

In addition, in this embodiment, the second support portion 55 is formed with a second support portion side chamfer 56, and the second shaft side chamfer 15 is formed on the tip side of the second shaft 11B, but the second support portion side chamfer 56 and the second shaft side chamfer 15 may be provided as necessary.

The above are various embodiments and modifications of the valve device and the method of assembling the valve device according to the present invention, but the present invention is not limited to the above-mentioned embodiments and modifications, and it will be easily understood by those skilled in the art that other embodiments are possible within the scope of the teachings and spirit of the present invention without departing from the scope of the claims.

The valve device, valve device assembly method, and valve device disassembly method of the present invention can be used for fluid flow paths (pipes) at high temperatures, normal temperatures, low temperatures (including cryogenic temperatures), etc. In addition, the valve device and valve device assembly method of the present invention can be used for various types of valve devices, such as top entry type, bottom entry type, and side entry type.

1: Valve device (ball valve)
2: Valve body 3: First fluid flow path 4: Second fluid flow path 5: Support portion 6: Pressing portion 7: Valve stem 10: Valve body 11: Shaft portion 11A: First shaft 11B: Second shaft 12: Shaft side connection portion (concave portion)
[0033] 15: Second shaft side chamfered portion 20: Valve chamber 21: Communication port 23: Wall portion 30: Valve seat 50: First support portion 55: Second support portion 56: Second support portion side chamfered portion 60: First pressing portion 61: First hole portion 62: First spring member 63: Insertion hole portion 64: Spherical member 65: Second pressing portion 66: Second hole portion 67: Second spring member 68: Insertion member 70: Valve stem side connection portion (convex portion)

Claims (15)

A valve box and
A valve chamber formed inside the valve body;
a valve body accommodated inside the valve chamber;
a first fluid flow passage communicating with the valve chamber;
a second fluid flow passage communicating with the valve chamber;
a valve seat provided at a communication port between the valve chamber and the second fluid flow path;
A shaft portion provided so as to protrude from the valve body;
A support portion that supports the shaft portion and is detachable from the valve body and the valve body;
a pressing portion that presses the valve body against the support portion in a direction in which the valve body approaches the valve seat;
The valve device according to claim 1, The support portion is a bearing that rotatably supports the shaft portion,
2. The valve device according to claim 1, wherein the valve element is ball-shaped and is capable of opening and closing the communication port by rotating in a state where the valve element is in contact with the valve seat. The shaft portion is
A first shaft provided so as to protrude from the valve body;
a second shaft provided to protrude from the valve body toward an opposite side to the first shaft;
and
The support portion is
A first support portion that supports the first shaft;
A second support portion that supports the second shaft;
and
The pressing portion is
a first pressing portion that presses the first support portion in a direction in which the valve body approaches the valve seat;
a second pressing portion that presses the second support portion in a direction in which the valve body approaches the valve seat;
3. The valve device according to claim 1 or 2, comprising: a second shaft chamfer portion formed in a tapered or rounded shape on a tip side of the second shaft;
a second support portion chamfered portion formed in a tapered or rounded shape around an upper end opening of the second support portion;
Equipped with
4. The valve device according to claim 3, wherein when the second shaft is fitted into the second support portion, the second shaft side chamfered portion abuts against the second support portion side chamfered portion, thereby pressing the second support portion in a direction away from the valve seat against the pressing force of the second pressing portion. The first pressing portion is
At least one first hole portion formed on the first fluid flow path side of the first support portion;
At least one first spring member received in the first hole;
having
The second pressing portion is
At least one second hole portion formed on the second support portion on the first fluid flow path side;
At least one second spring member received in the second hole;
having
a wall portion is provided around a communication port from the valve chamber to the first fluid flow path so as to face each of the opening ends of the first hole portion and the second hole portion,
The valve device according to claim 3 , wherein one end sides of the first spring member and the second spring member are configured to be able to abut against the wall portion. The first pressing portion is
an insertion hole portion that communicates with a bottom portion of the first hole portion and is formed to open in a direction intersecting the first hole portion;
a spherical member that is accommodated in the first hole portion on the side of the insertion hole portion and has a spherical surface facing the insertion hole portion;
It has
the insertion hole portion has at least a part of the spherical surface of the spherical member protruding therein and an insertion member can be inserted therein;
The valve device according to claim 5 , characterized in that, as the insertion member is inserted into the insertion hole portion, the insertion member and the spherical surface come into contact with each other and the first spring member is compressed via the spherical member. The valve device according to claim 6, characterized in that the insertion member has a tapered insertion tip. A screw groove is formed in the insertion hole,
7. The valve device according to claim 6, wherein the insertion member is formed as a screw and is screwed into the insertion hole as the insertion member is screwed into the screw groove. The valve device according to claim 6, characterized in that the spherical member is formed in a bullet shape. The valve device according to claim 1 or 2 is a top entry type, a bottom entry type, or a side entry type. The valve device according to claim 5, characterized in that the first spring member and the second spring member are provided in multiple numbers and are arranged symmetrically in the vertical direction and the horizontal direction. The shaft portion is formed separately from the valve rod, and has a shaft side connection portion for connecting to the valve rod on one end side,
The valve rod has a valve rod side connection portion at one end opposite to the shaft side connection portion,
A concave portion is formed in one of the shaft side connection portion and the valve stem side connection portion, and a convex portion engageable with the concave portion is formed in the other of the shaft side connection portion and the valve stem side connection portion,
The shaft portion and the valve rod can rotate together by engaging the concave portion and the convex portion with each other,
3. The valve device according to claim 1, wherein the recess is formed such that, when the first fluid flow path and the second fluid flow path are closed by the valve body, the valve body is movable in a direction along the first fluid flow path and the second fluid flow path. The contact surface of the insertion member with the spherical member is formed into a tapered or rounded shape,
The valve device according to claim 6 , wherein an amount of compression of the first spring member is adjustable by adjusting an insertion depth of the insertion member into the insertion hole. A method for assembling the valve device according to claim 3, comprising the steps of:
a second support portion disposing step of disposing the second support portion on a tip side of the second shaft in an insertion direction inside the valve chamber;
a second support portion mounting step of inserting the second shaft into the second support portion to separate the second support portion from the valve seat and mount the second support portion on the second shaft while avoiding interference between the valve body and the valve seat;
a first support portion mounting step of mounting the first support portion on the first shaft of the valve body in a state in which the pressing force of the first pressing portion is released;
a first pressing portion pressing force applying step of applying a pressing force by the first pressing portion;
a valve assembly assembly for assembling a valve device according to the present invention; A method for disassembling a valve device according to claim 3, comprising the steps of:
a first pressing portion pressing force releasing step of releasing the pressing force of the first pressing portion;
a first support portion removing step of removing the first shaft of the valve body from the first support portion in a state where the pressing force of the first pressing portion is released;
a second shaft removing step of removing the second shaft from the second support portion while separating the second support portion from the valve seat;
a second support part removing step of removing the second support part from inside the valve chamber;
The valve device disassembly method according to the present invention is characterized in that

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