JP2006052749A - Valve gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve gear having high sealing performance even for fluid containing foreign matter. <P>SOLUTION: In this valve gear 1 having a valve box 2 provided with a valve box port 2c being a fluid passage and a valve element 3 for opening and closing the valve box port 2c by vertical travel through a valve stem 4 by operating a handle 5, an auxiliary valve seat 8 provided in the valve box 2 is energized to the valve element 3 by a spring 9 to let the valve element 3, the auxiliary valve seat 8, and a valve seat 7 contact closely. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a valve device that opens and closes a fluid passage. For example, the present invention relates to a valve device that is preferably provided in a passage of a high-pressure fluid containing powder.

  The valve device mainly has a valve box that forms the outer shape of the device, and a valve body that is provided in the valve box and partitions the fluid passage, and the upstream valve seat and the downstream valve seat provided in the valve box are respectively The flow of fluid is blocked by closely contacting the valve body. In a state where the flow of the fluid is blocked, the upstream side from the valve body, the space in the valve box, and the downstream side from the valve body are partitioned. Further, the fluid passage is opened by moving the valve body to the open storage space in the valve box by operating the handle or the like.

  Therefore, as the performance of the valve device, the sealing performance between the valve body and the valve seat when the fluid passage is shut off is important, and various sealing structures and methods have been proposed in the past (see Patent Documents 1 and 2 below). reference.). In particular, depending on the location where the valve device is applied, the fluid may contain foreign substances such as powder, or it may be a fluid containing a radioactive substance, and the leak tolerance is set to be extremely low. In some cases, high sealing performance may be required.

JP 2001-235040 A Japanese Patent Laid-Open No. 5-141548

  In other words, in a fluid containing foreign matter, sealing performance deteriorates when foreign matter enters the sealing surface, so frequent maintenance is required, or leakage occurs due to the presence of a small amount of foreign matter on the sealing surface. There is a problem that the set allowable leak amount cannot be stably maintained. In addition, the cost for frequently solving such problems also increases. Furthermore, when the fluid to be handled is radioactive contaminants, the influence of the leak on the environment is naturally large.

  The present invention has been made in view of the above situation, and it is an object of the present invention to provide a valve device having high sealing performance against a fluid containing foreign matter, as well as when applied to a normal fluid. .

The valve device according to the present invention that solves the above problems is as follows.
A valve box provided with a fluid passage;
A valve body that is provided to block the fluid passage and opens and closes the fluid passage;
A valve seat that is provided in the valve box and seals a gap between the valve body and the fluid passage;
The valve body and the valve seat are in close contact with each other by an urging force from at least one of the valve body or the valve seat.

  By bringing the valve body and the valve seat into close contact with each other by an urging force, foreign matter can be prevented from entering the sealing surface, and the valve device has high sealing performance. In addition, foreign matter is prevented from entering the sealing surface, and the frequency of maintenance of the valve device is reduced. In particular, the valve device is effective when the fluid to be handled is radioactive contaminants.

In the above valve device,
The valve seat is urged by an elastic member and is in close contact with the valve body.

  By applying a structure having a biasing force to the valve seat, high sealing performance is ensured with a simple structure.

In the above valve device,
The valve device is characterized in that a seal member is provided in a gap between the valve seat and the valve box for moving.

  By sealing the gap, a storage portion provided in the valve box for opening and closing the valve body is isolated from the fluid passage. And it suppresses that the fluid which flows through a fluid passage leaks outside via a storage part.

In the above valve device,
The seal member is a labyrinth seal.

  The seal member is more effectively sealed as a labyrinth seal.

In the above valve device,
The valve seat that is energized and is in close contact with the valve body is a valve seat that seals a gap between the fluid passage on the relatively low pressure side and the valve body in the fluid passage that is blocked and divided by the valve body. There is a valve device.

  The structure that urges the valve seat to the valve body requires a clearance for the valve seat to move toward the valve body. If a large fluid pressure is applied to this clearance, the fluid will flow to the outside of the valve device. Since there is a risk of leakage, a valve seat having this function is applied to a relatively low pressure side to eliminate this risk.

In the above valve device,
The valve body is a valve device that is urged toward the valve seat and is in close contact with the valve seat by increasing a width in a fluid flow direction.

  The close contact between the valve body and the valve seat is improved to provide a valve device having high sealing performance.

In the above valve device,
The valve body is formed by combining divided valve bodies having inclined surfaces so that the inclined surfaces are in contact with each other, and the divided valve body and the other valve body are relatively slid on the inclined surface. By doing so, the valve device is characterized in that the width in the fluid flow direction changes.

  With this structure, the width of the valve body is changed and the valve body is biased to the valve seat without causing a gap that causes fluid leakage in the valve body itself.

In the above valve device,
One of the divided valve bodies is biased by an elastic member so that the width of the valve body in the fluid flow direction is increased.

  By always energizing one valve body with respect to the other divided valve body so that the width of the valve body is widened, the valve body is always kept in close contact with the opening and closing movement of the valve body. .

In the above valve device,
When the valve device is closed or opened, the one of the divided valve bodies is further urged by a fixing member fixed to the valve box so that the width of the valve body in the fluid flow direction is further increased. It is the valve apparatus characterized by being performed.

  When the valve device is closed or opened, the resistance to pressure at the time of fluid flow or pressure at the time of fluid shut-off is increased by further improving the sealing performance.

In the above valve device,
A valve device comprising a pressurizing means for pressurizing at least one of a storage portion provided in the valve box and a storage portion for opening and closing the valve body. is there.

  The storage part may have a gap that leads to the outside of the valve device. By placing the storage part in a high pressure state, fluid leakage that cannot be prevented by the sealing performance between the valve body and the valve seat. Suppress.

In the above valve device,
The said pressurization means is a valve apparatus characterized by pressurizing the pressure of the said accommodating part more than the pressure of the said fluid passage.

  By making the pressure in the storage portion equal to or higher than the pressure in the fluid passage, fluid leakage is further suppressed.

In the above valve device,
The valve device is characterized in that foreign matter removing means for preventing the inclusion of foreign matter contained in the fluid flowing through the fluid passage is provided on a surface where the valve body and the valve seat are in close contact with each other.

  As the valve body opens and closes, foreign matter contained in the fluid may enter the sealing surface between the valve body and the valve seat. This foreign matter removing means eliminates this risk and maintains high sealing performance.

In the above valve device,
The foreign matter removing means is a valve device provided in at least one of the valve body or the valve seat.

  The manufacturing cost of the valve device can be reduced by selecting the necessary part and providing the foreign substance removing means.

In the above valve device,
The foreign matter removing means is a valve device that is a groove provided in the valve body or the valve seat.

  By providing the groove on the contact surface, the foreign matter that has entered the contact surface is scraped off by the convex portions forming the groove, and the sealing property of the contact surface is maintained.

In the above valve device,
The groove is a valve device that is recessed downward in the vertical direction.

  Since foreign matter tends to accumulate in the groove recessed vertically upward, if the foreign material accumulates too much in the groove, there is a risk that the sealing performance will be adversely affected, but the groove recessed downward in the vertical direction. To eliminate this fear.

In the above valve device,
The valve body has an opening that is integral with the fluid passage when the valve device is opened,
The valve seat is a valve device that seals the opening portion stored in the storage portion when the valve device is closed.

  Even if the opening is housed in the housing, the opening is exposed to the housing and the fluid inside the opening or foreign matter adhering to the inner wall may leak into the housing. By sealing the opening, the storage portion is always isolated from the fluid passage such as the opening through which the fluid flows.

According to the valve device according to the present invention,
A valve box provided with a fluid passage;
A valve body that is provided to block the fluid passage and opens and closes the fluid passage;
A valve seat that is provided in the valve box and seals a gap between the valve body and the fluid passage;
Since the valve body and the valve seat are in close contact with each other by an urging force from at least one of the valve body or the valve seat,
It is possible to suppress the entry of foreign matter into the sealing surface and to provide a valve device having high sealing performance. In addition, it is possible to reduce the frequency of maintenance of the valve device by suppressing the entry of foreign matter into the seal surface. In particular, when the fluid to be handled is radioactive contaminants, an effective valve device can be obtained.

In the above valve device,
Since the valve seat is urged by an elastic member and is in close contact with the valve body,
High sealing performance can be secured with a simple structure.

In the above valve device,
Since the seal member is provided in the gap with the valve box for the valve seat to be urged and moved,
A storage portion provided in the valve box and for opening and closing the valve body can be isolated from the fluid passage. And it can suppress that the fluid which flows through a fluid passage leaks outside via a storage part.

In the above valve device,
Since the seal member is a labyrinth seal,
Further, it can be effectively sealed.

In the above valve device,
The valve seat that is energized and is in close contact with the valve body is a valve seat that seals a gap between the fluid passage on the relatively low pressure side and the valve body in the fluid passage that is blocked and divided by the valve body. Because there was something
It is possible to eliminate the possibility of fluid leaking outside the valve device through a clearance for the valve seat to move toward the valve body.

In the above valve device,
Since the valve body is urged toward the valve seat due to an increase in the width in the fluid flow direction, the valve body is in close contact with the valve seat.
It is possible to improve the adhesion between the valve body and the valve seat and to obtain a valve device having high sealing performance.

In the above valve device,
The valve body is formed by combining divided valve bodies having inclined surfaces so that the inclined surfaces are in contact with each other, and the divided valve body and the other valve body are relatively slid on the inclined surface. As a result, the width in the fluid flow direction will change.
The valve body can be urged toward the valve seat by changing the width of the valve body without causing a gap that causes fluid leakage in the valve body itself.

In the above valve device,
Since the one divided valve body is biased by the elastic member so that the width of the valve body in the fluid flow direction is increased,
Even when the valve body is opened and closed, it can be kept in close contact with the valve seat.

In the above valve device,
When the valve device is closed or opened, the one of the divided valve bodies is further urged by a fixing member fixed to the valve box so that the width of the valve body in the fluid flow direction is further increased. Because it was decided that
When the valve device is closed or opened, it is possible to increase resistance to pressure at the time of fluid flow or pressure at the time of fluid shut-off by increasing the sealing performance.

In the above valve device,
Since it has a pressurizing means for pressurizing at least one of the storage part provided in the valve box and the storage part for opening and closing the valve body or the storage part for moving closed,
The storage part may have a gap that leads to the outside of the valve device. By placing the storage part in a high pressure state, fluid leakage that cannot be prevented by the sealing performance between the valve body and the valve seat. Can be suppressed.

In the above valve device,
Since the pressurizing means pressurizes the pressure of the storage portion to be higher than the pressure of the fluid passage,
Furthermore, fluid leakage can be suppressed.

In the above valve device,
Since the surface where the valve body and the valve seat are in close contact with each other is provided with foreign matter removing means for preventing the inclusion of foreign matter contained in the fluid flowing through the fluid passage,
As the valve body opens and closes, foreign matter contained in the fluid may enter the sealing surface between the valve body and the valve seat. This foreign matter removing means can eliminate this possibility and maintain high sealing performance.

In the above valve device,
Since the foreign matter removing means is provided on at least one of the valve body or the valve seat,
The manufacturing cost of the valve device can be reduced by selecting the necessary part and providing the foreign substance removing means.

In the above valve device,
Since the foreign matter removing means is a groove provided in the valve body or the valve seat,
By providing the groove on the close contact surface, foreign matters that have entered the close contact surface can be scraped off by the convex portions forming the groove, and the sealing performance of the close contact surface can be maintained.

In the above valve device,
Since the groove is a groove recessed downward in the vertical direction,
Since foreign matter tends to accumulate in the groove recessed vertically upward, if the foreign material accumulates too much in the groove, the sealing performance may be adversely affected, but the groove is recessed downward in the vertical direction. This can eliminate this fear.

In the above valve device,
The valve body has an opening that is integral with the fluid passage when the valve device is opened,
Since the valve seat seals the opening stored in the storage when the valve device is closed,
Even if the opening is housed in the housing, the opening is exposed to the housing and the fluid inside the opening or foreign matter adhering to the inner wall may leak into the housing. By sealing the opening, the storage portion can always be isolated from the fluid passage such as the opening through which the fluid flows.

<First Embodiment>
FIG. 1 is a schematic cross-sectional structure diagram of the valve device according to the first embodiment. Hereinafter, although the valve apparatus which concerns on this embodiment is demonstrated, unless there is particular notice, the up-down direction used for description shall mean the up-down in drawing.

  As shown in the figure, the valve device 1 according to the present embodiment includes a valve body 3 that includes an opening portion 3a and a closing portion 3b and opens and closes a fluid passage, a closed valve body storage portion 2a, and an open valve body storage. A valve box 2 composed of a portion 2b and a valve box port 2c; a valve body 4 connected to the valve body 3 and allowing the valve body 3 to move up and down; And a handle 5 to be rotated.

  The fluid passage communicates with a valve box port 2c provided through the valve box 2, and fluid flows through the valve box port 2c. The valve element 3 connected to the valve stem 4 moves up and down by rotating the handle 5 and rotating the sleeve axially. In order to seal the inside of the valve box 2, a packing 6 is provided at the neck portion of the valve box 2 to seal a gap between the valve rod 4 and the valve rod 4.

  When the valve body 3 moves downward, the closed portion 3b, which is the lower part of the valve body 3, is housed in the open valve body housing section 2b provided below the valve box 2, and above the valve body 3 The opening 3 a provided in the part is integrated with the valve box port 2 c, and the valve box port 2 c functions as a fluid passage in the valve box 2. As a result, the valve device 1 is opened as shown in FIG.

  When the valve body 3 moves upward, the opening 3a provided in the upper part of the valve body 3 is housed in the closed valve body housing part 2a provided in the valve box 2 and the valve body 3 The closed portion 3b which is a lower portion of the valve block the valve box port 2c at the center and prevent the flow of fluid in the fluid passage. As a result, the valve device 1 is closed.

  In order to shut off the valve box port 2c through which the fluid flows, the closed valve body storage part 2a and the open valve body storage part 2b, and in particular the closed valve body storage part 2a, the valve body 3 and the valve in the valve box 2 A valve seat 7 is provided on the upstream side in the fluid flow direction and an auxiliary valve seat 8 is provided on the downstream side on the surface close to the box port 2c.

  When these valve seats are in close contact with the valve body 3, the valve box port 2c and the valve body storage portions 2a and 2b are shut off. Here, in particular, the closed valve body storage portion 2a and the valve box port 2c are blocked by the space when the closed valve body storage portion 2a communicates with the outside of the valve device 1, and the closed valve body storage portion 2a. This is because the fluid may leak further to the outside.

  Further, the auxiliary valve seat 8 is pressed against the valve body 3 by a spring 9 which is an elastic member, so that the auxiliary valve seat 8 is strongly adhered. As a result, when the valve device 1 is opened and closed, the valve body 3 is always sealed by the valve seat 7 and the auxiliary valve seat 8 without being separated, and the valve body housing of the fluid flowing through the valve box port 2c is closed. Leakage to the part 2a can be prevented.

  The auxiliary valve seat 8 provided with the spring 9 is provided on the downstream side in the fluid flow direction with respect to the valve seat 7, but basically either the upstream side or the downstream side in the flow direction. May be provided. However, when the valve device 1 is closed, it is preferable to provide the valve seat 7 in a direction where pressure is more applied by the fluid flowing in the fluid passage and provide the auxiliary valve seat 8 in a direction where relatively no pressure is applied.

  This is because the structure in which the auxiliary valve seat 8 is biased to the valve body 3 by the spring 9 needs to provide a clearance for the auxiliary valve seat 8 to move toward the valve body 3, and the pressure of the fluid is in this clearance. This is because a large amount of fluid may leak to the outside of the valve device 1 through the closed valve body storage portion 2a.

  For example, when the valve device 1 is provided in a fluid passage constantly supplied with fluid, when the valve is closed, a large pressure is exerted by the fluid on the upstream side in the fluid flow direction. Therefore, the auxiliary valve having the spring 9 is provided. The seat 8 is preferably provided on the downstream side as shown in FIG. However, even if the fluid passage is always supplied with fluid, after closing the valve, it communicates with the device using the pressurization provided on the downstream side in the fluid flow direction. When a large pressure is applied, the auxiliary valve seat 8 is provided on the upstream side.

  Further, the valve device 1 can be applied not to a fluid but to a passage of a solid substance such as powder. Also in this case, the valve seat 7 is provided in the direction where pressure is applied more on the upstream side and the downstream side of the passage, and the auxiliary valve seat 8 is provided in the direction where relatively no pressure is applied. For example, when a pressurizing device such as a supercritical extraction tower is provided on the downstream side, the auxiliary valve seat 8 is provided on the upstream side.

  The valve box 2 is provided with an air introduction hole 10 which is a hole communicating with the closed valve body storage portion 2a, and an air source 11 is connected to the air introduction hole 10 so that the air is closed. 2a is supplied (pressure means).

  As described above, the structure in which the auxiliary valve seat 8 is biased to the valve body 3 by the spring 9 needs to provide a clearance for the auxiliary valve seat 8 to move toward the valve body 3. By supplying air to the valve body housing portion 2a at the time of closing and setting the pressure of the valve body housing portion 2a at the time of closing to be equal to or higher than the pressure in the valve box port 2c, It is possible to eliminate the risk of leakage.

  The fluid introduced into the closed valve body storage portion 2a is not particularly limited as long as it is a fluid capable of pressurizing the closed valve body storage portion 2a. Although air, nitrogen gas, etc. can be considered, the fluid which flows out into the valve box port 2c and flows through the port and the fluid which does not adversely affect the reaction device installed on the downstream side of the valve device 1 are desirable.

  FIG. 2 is an enlarged view of a portion A in FIG. Around the auxiliary valve seat 8, there is a gap for providing the spring 9, and a gap for moving when the auxiliary valve seat 8 is energized. The valve box port 2c and the closed valve body storage portion 2a are Spatial connection.

  Here, as shown in FIG. 2, by installing a labyrinth seal 12 that seals the gap with the auxiliary valve seat 8 in the valve box 2, the function of the auxiliary valve seat 8 is maintained and the valve box port 2c flows. The fluid can be prevented from leaking outside through the gap. The labyrinth seal may be provided on the auxiliary valve seat 8.

  In this embodiment, the auxiliary valve seat 8 can be urged and brought into close contact with the valve body 3 or the labyrinth seal 12 can be provided to prevent foreign matter from entering the sealing surface. It can be set as the valve apparatus which has sealing performance. In addition, the frequency of maintenance of the apparatus can be reduced. In particular, when the fluid to be handled is a radioactive contaminant or the like, an effective valve device is obtained.

  As for the valve seat, both the upstream and downstream valve seats may be urged by an elastic member so as to be in close contact with the valve body. Examples of the elastic member include a coil spring. Moreover, as a sealing member, a gland packing etc. other than a labyrinth seal is mentioned.

<Second Embodiment>
FIG. 3 is a schematic cross-sectional structure diagram of the valve device according to the second embodiment. 4 is a cross-sectional view taken along arrow IV-IV in FIG. Hereinafter, although the valve apparatus which concerns on this embodiment is demonstrated, unless there is particular notice, the up-down direction used for description shall mean the up-down direction in drawing, and the left-right direction shall mean the left-right in drawing.

  As shown in these drawings, the valve device 21 according to the present embodiment includes a valve body 23 that opens and closes a fluid passage, a valve body holding ring 34 that houses the valve body 23, and a lower portion that is sealed by a flange 33, and is closed. A valve rod 22 that is connected to the valve body 22 including the hour valve body storage portion 22a, the opened valve body storage portion 22b, and the valve box port 22c, and the valve body holding ring 34, and allows the valve body 23 to move up and down. 24 and a handle 25 connected to the valve stem 24 and rotating the valve stem 24.

  The fluid passage communicates with a valve box port 22c provided through the valve box 22, and fluid flows through the valve box port 22c. The valve body holding ring 34 connected to the valve stem 24 moves up and down together with the valve stem 24 by rotating the handle 25 and the sleeve 43. Along with this, the valve body 23 housed in the valve body holding ring 34 also moves up and down together.

  Further, in order to seal the inside of the valve box 22, a gland packing 26 a and a dust packing 26 b are provided at the neck portion of the valve box 22 to seal a gap between the valve rod 24 and the valve rod 24.

  When the valve body 23 moves downward, the opening 23a provided in the lower part of the valve body 23 is housed in the closed valve body housing section 22a provided in the valve box 22 and the valve body 23. A blocking portion 23b that is an upper portion of the valve block the valve box port 22c at the center to prevent the flow of fluid in the fluid passage. As a result, the valve device 21 is closed as shown in FIG.

  When the valve body 23 moves upward, the closing portion 23b, which is the upper part of the valve body 23, is stored in the open-time valve body storage portion 22b provided above the valve box 22, and below the valve body 23. An opening 23 a provided in the portion is integrated with the valve box port 22 c, and the valve box port 2 c functions as a fluid passage in the valve box 22. As a result, the valve device 21 is opened.

  In order to shut off the valve box port 22c through which the fluid flows, the closed valve body storage part 22a and the open valve body storage part 22b, and in particular, the open valve body storage part 22b, the valve body 23 and the valve in the valve box 22 On the surface close to the box port 22c, a valve seat 27a is provided on the downstream side in the fluid flow direction, and a valve seat 27b is provided on the upstream side.

  When the valve seats 27a and 27b are in close contact with the valve body 23, the valve box port 22c and the valve body storage portions 22a and 22b are shut off. Here, in particular, the open valve body storage portion 22b and the valve box port 22c are blocked by the open valve body storage portion 22b, which is a space communicating with the outside of the valve device 21, and the open valve body storage portion 22b. This is because the fluid may leak further to the outside.

  Since the closed valve body storage portion 22a is a space whose lower portion is sealed by the flange 33, it is necessary to be more concerned about leakage to the outside than the open valve body storage portion 22b having a sliding structure such as packing. There is no space.

  The valve body 23 includes an opening 23a at the lower portion and a closing portion 23b at the upper portion, and is composed of a divided valve body 23c and a divided valve body 23d that are divided into left and right on the divided inclined surface 23e. The divided inclined surface 23e is a surface inclined at a predetermined angle from the rod axis of the valve rod 24.

  That is, the divided valve bodies 23c and 23d are both wedge-shaped, and the divided valve body 23c has a wedge shape in which the width along the fluid passage direction (the width on the left and right in the drawing) decreases as it goes downward. On the other hand, the shape of the divided valve body 23d is a wedge shape whose width decreases as it goes upward.

  The valve body 23 has a structure in which the inclined surface of the divided valve body 23c and the inclined surface of the divided valve body 23d are in contact with each other. For example, the divided valve body 23c is fixed and the divided valve body 23d is moved up and down. In this case, the width of the valve body 23 along the fluid passage direction changes. That is, when the divided valve body 23d is moved upward with respect to the divided valve body 23c, the width along the fluid passage direction of the valve body 23 increases, and when the divided valve body 23d is moved downward, the valve body 23 The width becomes smaller.

  FIG. 5 is an enlarged view of the valve body portion in FIG. 3. FIG. 5 shows a state in which the valve device 21 is applied to a fluid passage extending in the vertical direction, and the valve box port 22c is shown as a vertical port so as to be along the vertical direction. Therefore, in the relationship between FIG. 5 and FIGS. 3 and 4, the upward and downward directions in FIGS. 3 and 4 correspond to the right and left directions in FIG. 5, respectively.

  As shown in detail in the drawing, the length of the split valve body 23d along the axial direction of the valve stem 24 is smaller than that of the split valve body 23c. Therefore, when the valve body 23 is housed in the valve body holding ring 34, the outer periphery of the divided valve body 23c (the outer periphery of the valve body 23 is shown over the entire circumference in FIG. 4) is the valve body holding ring. 34 is in contact with the inner periphery of the valve body retaining ring 34. Similarly, the outer periphery of the split valve body 23d is in contact with the inner periphery of the valve body retaining ring 34. The split valve element 23d is held in the holding ring 34 so that it cannot move in the axial direction of the valve stem 24.

  As shown in FIG. 5, a hole communicating with the inside of the ring is provided on the left side (downward in FIGS. 3 and 4) of the valve body holding ring 34 on the divided valve body 23d side. A spring receiver 36 is fixed outside the ring of the hole, and a spring 35, which is an elastic member, is supported by the spring receiver 36 on the left side (downward in FIGS. 3 and 4) and is fitted in the hole. As a result, the divided valve body 23d that is housed in the valve body retaining ring 34 and is movable is always biased rightward (upward in FIGS. 3 and 4) in the ring. Examples of the elastic member include a spring.

  As described above, the valve body 23 is formed into two wedge-shaped split valve bodies 23c and 23d, the split valve body 23c is fixed in the valve body holding ring 34, and the split valve body 23d is always moved rightward by the spring 35. By energizing, the width of the valve body 23 along the fluid passage direction (the width in the left-right direction in the drawing) can be increased, and the valve body 23 can always be in close contact with the valve seats 27a and 27b.

  As a result, when the valve device 21 is opened and closed, the valve body 23 and the valve seats 27a and 27b are always sealed without being separated, and the fluid flowing through the valve box port 22c is moved to the opened valve body storage portion 22b. Can prevent leakage.

  Further, a rod-like stopper 37 (fixing member) extending in the axial direction of the valve rod 24 is fixed to the flange 33. When the valve body retaining ring 34 moves to the left, the stopper 37 is inserted into the spring receiver 36 and the spring 35. When the spring receiver 36 hits the flange 33 and the valve element holding ring 34 has completely moved to the left, the stopper 37 protrudes into the ring of the valve element holding ring 34 by a predetermined amount.

  In particular, when the valve device 21 is closed, the valve body 23 and the valve seats 27a and 27b need to be brought into close contact with each other to improve the sealing performance and prevent fluid leakage. In the present embodiment, the split valve body 23d is pushed rightward by the stopper 37 in the valve body retaining ring 34, so that the width along the fluid passage direction of the valve body 23 is further increased, and the urging force by the spring 35 is increased. As described above, the valve body 23 can be brought into close contact with the valve seats 27a and 27b with a stronger force.

  Further, when the valve is closed, a valve body side foreign matter scraping projection 38a including two grooves as foreign matter removing means is provided at a contact portion of the divided valve body 23c with the valve seat 27a. The shape of the valve element side foreign matter scraping protrusion 38a is the same as the cross-sectional shape of the valve seat 27a formed so as to surround the outer periphery of the valve box port 22c. For example, when the shape of the valve seat 27a is a ring shape, a ring-shaped groove is formed.

  Further, when the valve is opened, a valve element side foreign matter scraping projection 38a including two grooves is also provided at a contact portion of the divided valve element 23c with the valve seat 27a. The groove shape is as described above, in other words, a shape along the outer periphery of the opening 23a. For example, when the shape of the opening 23a is a circle (see FIG. 4), a ring-shaped groove is formed.

  On the other hand, a valve seat side foreign matter scraping projection 38b including two grooves is also provided at a portion of the valve seat 27b that contacts the divided valve body 23d. The shape of the valve seat side foreign material scraping protrusion 38b is the same as the cross-sectional shape of the valve seat 27b formed so as to surround the outer periphery of the valve box port 22c. For example, when the shape of the valve seat 27b is a ring shape, a ring-shaped groove is formed.

  When the valve device 21 is applied to a fluid passage of a fluid containing foreign matter such as powder, foreign matter adheres to the inner surface of the valve box port 22c, the inner surface of the opening 23a, the wall surface of the closing portion 23b, etc. When the valve body 23 is moved while being in close contact with 27a, 27b, there is a possibility that the adhered foreign matter may enter the contact surface between the valve seats 27a, 27b and the valve body 23.

  Therefore, by providing foreign matter scraping protrusions 38a and 38b on the close contact surface, the foreign matter that has entered the close contact surface is scraped off by the three convex portions forming the foreign matter scraping protrusion, thereby maintaining the sealing performance of the close contact surface. Can do.

  The foreign matter scraping protrusion may be provided on the valve body 23 or on the valve seats 27a and 27b. However, for example, as shown in FIG. 5, when the valve device 21 is installed in a fluid passage in which the fluid flow direction is vertically downward, the valve body side foreign matter scraping protrusion 38a and the valve seat side foreign matter scraping protrusion 38b are used. In addition, it is preferable that a foreign matter scraping projection is provided on the valve seat 27b side on the upstream side in the fluid flow direction, and a foreign matter scraping projection is provided on the divided valve body 23c side on the downstream side.

  This is because if a foreign substance scraping protrusion is provided on the divided valve body 23d side on the upstream side in the fluid flow direction, or a foreign substance scraping protrusion is provided on the valve seat 27a side on the downstream side, This is because foreign matter tends to accumulate, and if foreign matter accumulates too much in the groove, the sealing performance may be adversely affected. Accordingly, it is preferable that the groove is recessed vertically downward.

  Moreover, it is preferable to provide a foreign matter removing means such as a groove on the contact surface between the divided valve body 23d and the valve seat 27b on the valve seat 27b side. This is because the divided valve body 23c is fixed in the valve body holding ring 34, whereas the divided valve body 23d is movable left and right in the valve body holding ring 34. Since the contact portion of the body 23d with the valve seat 27b may slightly change, if a foreign matter removing means such as a groove is provided in the divided valve body 23d, the positioning of the means and the valve seat 27b may not be successful. It is.

  As in the first embodiment, the fluid is opened by supplying air to the open valve body storage portion 22b and setting the pressure of the open valve body storage portion 22b to be equal to or higher than the pressure in the valve box port 22c. The possibility of leaking to the outside of the valve device 21 through the hour valve body storage portion 22b can be further eliminated.

  In the present embodiment, the valve body 23 is configured to be capable of changing the width, and the valve body 23 is urged and brought into close contact with the valve seats 27a and 27b, or foreign matter scraping protrusions 38a and 38b are provided on the contact surfaces. Therefore, it is possible to prevent foreign matter from entering the seal surface, and as a result, a valve device having high sealing performance can be obtained. In addition, the frequency of maintenance of the apparatus can be reduced. In particular, when the fluid to be handled is a radioactive contaminant or the like, an effective valve device is obtained.

<Third Embodiment>
FIG. 6 is a schematic sectional view of a valve device according to the third embodiment. The valve device according to the present embodiment is a modification of the valve device according to the second embodiment, and members having the same functions are denoted by the same reference numerals and the same description is omitted. Hereinafter, although the valve apparatus which concerns on this embodiment is demonstrated, unless there is particular notice, the up-down direction used for description shall mean the up-down in drawing.

  As shown in FIG. 6, in the valve device 41 according to the present embodiment, even when the valve seats 42 a and 42 b are enlarged and the valve body 23 moves downward, the opening 23 a remains in the valve seat 42 a. , 42b.

  In the second embodiment, as shown in FIG. 3, when the valve body 23 moves downward, the opening 23 a is exposed to the closed valve body storage portion 22 a, and the fluid and the inner wall of the opening 23 a are exposed. There was a possibility that adhered foreign matter or the like may leak into the valve body storage portion 22a when closed.

  In the third embodiment, even when the valve body 23 moves downward, the opening 23a is closed by the valve seats 42a and 42b, and the closed valve body storage section 22a and the open valve body storage are stored. The part 22b can always be isolated from the opening 23a through which the fluid flows and the valve box port 22c.

  In the second and third embodiments, the opening 23a is provided in the lower part of the valve body 23 and the upper part is the closing part 23b. Conversely, the opening is provided in the upper part and the lower part is closed. It is good also as a part (a valve body accommodating part at the time of closing is formed above a valve box, and a valve body accommodating part at the time of opening is formed below). In this case, when closed, the opening is exposed to the closed valve body housing portion that may lead to the outside of the valve device, and there is a risk of fluid leakage, but the packings 26a and 26b have high sealing properties. Etc. In addition, since the effect of the further adhesion by the stopper 37 is produced when opened, it is suitable when it is desired to improve the sealing performance of the fluid passage when opened.

1 is a schematic sectional view of a valve device according to a first embodiment. It is an enlarged view of the A section in FIG. It is a schematic sectional structure figure of the valve device concerning a 2nd embodiment. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 3. It is an enlarged view of the valve body part in FIG. It is a schematic sectional drawing of the valve apparatus which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve apparatus 2 Valve box 2a Closed valve body accommodating part 2b Opened valve element accommodating part 2c Valve box port 3 Valve body 3a Opening part 3b Closed part 4 Valve rod 5 Handle 6 Packing 7 Valve seat 8 Auxiliary valve seat 9 Spring 10 Air introduction hole 11 Air source 12 Labyrinth seal 21 Valve device 22 Valve box 22a Closed valve element storage part 22b Open valve element storage part 22c Valve box port 23 Valve element 23a Opening part 23b Closure part 23c Split valve element 23d Split valve element 23e Divided inclined surface 24 Valve rod 25 Handle 26a Gland packing 26b Dust packing 27a Valve seat 27b Valve seat 33 Flange 34 Valve body retaining ring 35 Spring 36 Spring receiving 37 Stopper 38a Valve body side foreign material scraping projection 38b Valve seat side foreign material scraping projection 41 Valve device 42a Valve seat 42b Valve seat 43 Sleeve

Claims (16)

A valve box provided with a fluid passage;
A valve body that is provided to block the fluid passage and opens and closes the fluid passage;
A valve seat that is provided in the valve box and seals a gap between the valve body and the fluid passage;
The valve device and the valve seat are in close contact by an urging force from at least one of the valve body or the valve seat. The valve device according to claim 1,
The valve device, wherein the valve seat is urged by an elastic member and is in close contact with the valve body. The valve device according to claim 2,
A valve device characterized in that a seal member is provided in a gap with the valve box for the valve seat to be urged and moved. The valve device according to claim 3,
The valve device, wherein the seal member is a labyrinth seal. The valve device according to any one of claims 2 to 4,
The valve seat that is energized and is in close contact with the valve body is a valve seat that seals a gap between the fluid passage on the relatively low pressure side and the valve body in the fluid passage that is blocked and divided by the valve body. A valve device characterized by being. The valve device according to claim 1,
The valve device is characterized in that when the width in the fluid flow direction increases, the valve body is urged toward the valve seat and is in close contact with the valve seat. The valve device according to claim 6,
The valve body is formed by combining divided valve bodies having inclined surfaces so that the inclined surfaces are in contact with each other, and the divided valve body and the other valve body are relatively slid on the inclined surface. By doing so, the width | variety of the fluid flow direction changes, The valve apparatus characterized by the above-mentioned. The valve device according to claim 7,
One of the divided valve bodies is biased by an elastic member so that the width of the valve body in the fluid flow direction is increased. The valve device according to claim 7 or 8,
When the valve device is closed or opened, the one of the divided valve bodies is further urged by a fixing member fixed to the valve box so that the width of the valve body in the fluid flow direction is further increased. A valve device. The valve device according to any one of claims 1 to 9,
A valve device comprising pressurizing means for pressurizing at least one of a storage portion provided in the valve box and a storage portion for opening and closing the valve body. The valve device according to claim 10, wherein
The said pressurizing means pressurizes the pressure of the said accommodating part more than the pressure of the said fluid passage, The valve apparatus characterized by the above-mentioned. The valve device according to any one of claims 1 to 11,
A valve device characterized in that a foreign substance removing means for preventing the inclusion of a foreign substance contained in the fluid flowing through the fluid passage is provided on a surface where the valve body and the valve seat are in close contact with each other. The valve device according to claim 12,
The valve device, wherein the foreign matter removing means is provided on at least one of the valve body or the valve seat. The valve device according to claim 13,
The valve device, wherein the foreign matter removing means is a groove provided in the valve body or the valve seat. The valve device according to claim 14,
The said groove | channel is a groove | channel dented toward the downward direction of a perpendicular direction, The valve apparatus characterized by the above-mentioned. The valve device according to any one of claims 1 to 15,
The valve body has an opening that is integral with the fluid passage when the valve device is opened,
The valve device, wherein the valve seat seals the opening accommodated in the accommodating portion when the valve device is closed.

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