JP3160208B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device having a double-seat plug.

[0002]

2. Description of the Related Art A valve device shown in FIG. 4 is conventionally known as a valve device having a so-called double-seat plug. Here, FIG. 4 is a vertical sectional view showing a conventional valve device. In the figure, reference numeral 31 denotes a main body having conduits 32 and 33 whose opening and closing are to be controlled, and 31b denotes a stem insertion hole 34a and a conduit 3 to be described later.
3 is a bypass hole that communicates with No. 3. Reference numeral 34 denotes an upper cover fixed to the upper portion of the main body 31 by stud bolts 35 and hexagon nuts 36; 34a, a stem insertion hole for inserting a stem 40 to be described later; 37a, 37b connecting the pipe 32 and the pipe 33. It is a communication hole. 38a and 38b are provided in the communication holes 37a and 37b with or without the gasket 39 interposed therebetween.
And a seat ring formed so as to be able to abut.

A stem 40 is connected to a driving device (not shown) such as a pneumatic type or a motor type, and moves a plug 43 described later up and down or horizontally. Has been inserted through.

The upper portion 43 is integrally joined to the stem 40 so as to be movable up and down.
38b is a plug formed to be engageable with the communication hole 3b.
By opening and closing 7a and 37b, pipeline 32 and pipeline 33 are opened.
And can be communicated freely.

[0005] Reference numeral 45 denotes a shaft-like plug guide portion provided integrally with the bottom of the plug 43, which is formed so as to be insertable into a guide hole 50a provided in the lower lid 50 and slides with respect to the guide hole 50a. It is formed freely. The depth of the guide hole 50a is set so that the plug 43 does not come off in consideration of the stroke length when the plug 43 moves up and down. The lower lid 50 is fixed to the main body 31 with stud bolts 52 and hexagon nuts 53.
Also, 50b is a pipe 3 for transferring the fluid accumulated in the guide hole 50a.
3 is a bypass hole for discharging to 3.

Next, the operation will be described. The stem 40 has a stroke set in advance by a driving device (not shown).
Moves up and down, whereby the plug 43 moves up and down. In this case, the plug guide portion 45 is held by the guide hole 50a, and the movement in the horizontal direction is restricted. Plug 4
When the plug 3 is engaged with the seat rings 38a and 38b, the conduits 32 and 33 are not communicated. When the plug 43 is not engaged with the seat rings 38a and 38b, the conduits 32 and 33 are communicated. Will be done. When the plug guide 45 is damaged due to vibration, corrosion, or the like and needs to be replaced, the lower lid 50 is removed and the entire plug 43 integrated with the plug guide 45 is replaced.

[0007]

Since the conventional valve device is configured as described above, the lower lid 50 must be provided with a guide hole 50a having a predetermined depth, and the thickness of the lower lid 50 increases. Since the amount of protrusion of the bottom of the main body 31 increases, there is a problem that a lower working space cannot be sufficiently secured after the valve device is installed, and the lower lid 50 cannot be removed.

Further, since the plug guide portion 45 is formed integrally with the plug 43, if the plug guide portion 45 is damaged due to vibration or corrosion, or needs to be replaced for maintenance or the like, the plug need not be replaced. 43 had to be exchanged together, which was uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to secure a sufficient work space below even after the valve device is installed, and to provide only the plug guide portion at the time of maintenance or the like. An object of the present invention is to obtain a valve device which can be easily replaced and has excellent cost performance. Another object of the present invention is to provide a valve device in which a plug can operate smoothly.

[0010]

The valve device according to the invention SUMMARY OF THE INVENTION The first aspect, a body having a conduit to be opened and closed control, the
A plug disposed in the main body and having a guide hole, a stem for moving the plug forward and backward, and a plug guide formed to be engageable with the guide hole of the plug and detachably provided near a bottom of the main body. Provided , wherein said
The main body has a plug guide mounting hole at the bottom thereof, and
The lug guide has a smaller diameter than the plug guide mounting hole
Larger diameter than the formed tip and the plug guide mounting hole
And a part formed in the plug guide.
With the tip part inserted into the plug guide mounting hole,
By attaching the plug guide to the outside of the main body
It is provided so as to be detachable in the lateral direction .

According to a second aspect of the present invention, there is provided a valve device which removes fluid accumulated in a space formed by the plug guide and the guide hole when the plug guide and the guide hole engage .
The bypass hole for discharging to the outside of the space, in which provided on the plug guide or the plug.

According to a third aspect of the present invention, at least one of the engagement surfaces of the plug guide and the guide hole is provided with a lubricant.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a vertical sectional view showing a valve device according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a main body having conduits 2 and 3 whose opening and closing are to be controlled, and 1a denotes a screw hole at the bottom of the main body 1. A plug guide mounting hole provided as a plug guide 15 is formed by screwing a plug guide 15 described later. 1b is a stem insertion hole 4a to be described later.
And a bypass hole that communicates with the pipeline 3. Reference numeral 4 denotes an upper cover fixed to an upper portion of the main body 1 by a stud bolt 5 and a hexagon nut 6, and a gasket (not shown) is provided between the upper cover 4 and the main body 1. Reference numeral 4a denotes a stem insertion hole for inserting a stem 10 to be described later, and reference numerals 7a and 7b denote communication holes for connecting the pipe 2 and the pipe 3. Reference numerals 8a and 8b denote seat rings provided in the communication holes 7a and 7b via the gasket 9, and formed so as to be able to abut a plug 13 described later.

Reference numeral 10 denotes a stem which is connected to a driving device such as a diaphragm motor (not shown), and which vertically moves or horizontally moves a plug 13 which will be described later. Has been inserted.

The upper part 13 is integrally joined to the stem 10 so as to be movable up and down, and the seat rings 8a, 8
b is a plug formed to be engageable with the communication holes 7a,
By opening and closing 7b, the pipeline 2 and the pipeline 3 can be freely communicated.

Reference numeral 14 denotes a guide hole provided at the bottom of the plug 13 and a part of a later-described plug guide 15 provided in the main body 1 is inserted and slidably formed. Therefore, the depth of the guide hole 14 is set so that the plug 13 does not come off in consideration of the stroke length when the plug 13 moves up and down, and the inner diameter of the guide hole 14 takes into account the fitting with the plug guide 15. Is set.

Reference numeral 15 denotes a shaft-shaped plug guide having a male screw portion 15a which can be screwed into the plug guide mounting hole 1a of the main body 1 and a guide portion 15b formed so as to be engageable with the guide hole 14 of the plug 13. . The bottom of the male screw portion 15a is formed in a shape such that a tool such as a spanner can be used, for example, a hexagonal shape. This plug guide 1
5 can be made of a corrosion-resistant material or a heat-resistant material corresponding to the properties of the fluid, or a high-strength material capable of coping with vibrations caused by the fluid. The threaded portion is provided with a predetermined sealing according to the prior art so as to prevent fluid leakage.

Next, the operation will be described. The stem 10 has a stroke set in advance by a driving device (not shown).
Moves up and down, whereby the plug 13 moves up and down. In this case, when the plug 13 is engaged with the seat rings 8a and 8b, the pipeline 2 and the pipeline 3 are not communicated. When the plug 13 is not engaged with the seat rings 8a and 8b, the pipeline 2 and the pipeline are not connected. Road 3 will be in communication. The guide portion 15b of the plug guide 15 is inserted into the guide hole 14 of the plug 13, and the plug 13 slides with respect to the plug guide 15, so that the operation in the horizontal direction is restricted. Therefore, the engagement between the plug 13 and the seat rings 8a, 8b is appropriately performed, and the fluid leakage when the plug 13 is closed is effectively prevented. When the plug guide 15 is damaged due to vibration or corrosion and needs to be replaced, or when replacement is required due to maintenance or the like, the male screw portion 1 of the plug guide 15 is required.
By screwing or loosening 5a, only the plug guide 15 needs to be replaced.

As described above, according to the first embodiment, the provision of the plug guide 15 allows the plug 13 and the seat rings 8a and 8b to be properly engaged with each other, and the plug 13 is closed. In addition to effectively preventing fluid leakage,
When the plug guide 15 is damaged due to vibration or corrosion and needs to be replaced, or when replacement is required due to maintenance or the like, the male screw portion 15a of the plug guide 15 is screwed or loosened to remove only the plug guide 15. The effect that the valve device which can be easily replaced and which is excellent in cost performance can be provided is obtained.

Further, the adoption of the plug guide 15 which can be directly fixed to the main body 1 eliminates the necessity of the lower cover 50 which has been required in the prior art.
The amount of protrusion of the bottom portion is reduced, and the effect of reducing the size of the entire device can be obtained.

Furthermore, since the amount of protrusion of the bottom of the main body 1 is reduced, a sufficient working space below the valve device can be secured after the valve device is installed, so that the maintenance work of the plug guide 15 and the like can be easily performed.

Embodiment 2 FIG. FIG. 2 is a vertical sectional view showing a valve device according to a second embodiment of the present invention. In the figure, reference numeral 18 denotes an integral seat ring formed so as to be able to abut on the plug 13 and has a through hole 18a. I have. Reference numeral 20 denotes a shaft-shaped plug guide formed so as to be able to engage with the guide hole 14 of the plug 13, and is fitted through a gasket 22 into a plug guide mounting hole 21 provided in the main body 1. Reference numeral 20a denotes a bypass hole having openings on the upper surface of the plug guide 20 and on the side surface of the plug guide 20 that is not inserted into the guide hole 14 of the plug 13. That is, when the plug 13 descends, the bypass hole 20a discharges the fluid remaining in the space formed by the upper surface of the plug guide 20 and the guide hole 14 to the outside of the space, thereby providing a pressure resistance at the time of descending. The purpose of this is to eliminate the fluid that is to be used and to make the lowering operation of the plug 13 smooth. Reference numeral 23 denotes a lower lid fixed to the bottom of the main body 1 with a hexagonal bolt 24 for pressing and fixing the plug guide 20.

Next, the operation will be described. The stem 10 has a stroke set in advance by a driving device (not shown).
Moves up and down, whereby the plug 13 moves up and down. In this case, when the plug 13 is engaged with the integral seat ring 18, the conduit 2 and the conduit 3 are not in communication, and when the plug 13 is not engaged with the integral seat ring 18, the conduit 2 and the conduit 3 are not connected. Road 3 will be in communication. Also, a part of the plug guide 20 is inserted into the guide hole 14 of the plug 13, and the plug 13 slides with respect to the plug guide 20, so that the operation in the horizontal direction is restricted. Accordingly, the engagement between the plug 13 and the integral seat ring 18 is appropriately performed, and the fluid leakage when the plug 13 is closed is effectively prevented. Further, when the plug 13 descends, the fluid that accumulates in the space formed by the upper surface of the plug guide 20 and the guide hole 14 is discharged out of the space through the bypass hole 20a, and the pressure resistance and the pressure resistance at the time of descending are reduced. Fluid is eliminated.

As described above, according to the second embodiment, the provision of the plug guide 20 allows the plug 13
And the integral seat ring 18 is properly engaged to effectively prevent fluid leakage when the plug 13 is closed. In addition, when the plug guide 20 is damaged due to vibration, corrosion, or the like and needs to be replaced, In the case where replacement is required due to maintenance or the like, by removing the lower cover 23, only the plug guide 20 can be easily replaced, thereby providing an effect that a valve device excellent in cost performance can be provided.

Further, the guide hole 5 is formed in the lower lid 50 as in the prior art.
Since there is no need to provide Oa, the lower lid 23 having a small thickness can be employed, and the amount of protrusion of the bottom of the main body 1 is reduced, so that the effect of reducing the size of the entire apparatus is obtained.

Furthermore, since the amount of protrusion of the bottom of the main body 1 is reduced, a sufficient working space below the valve device can be secured after the valve device is installed, so that the maintenance work of the plug guide 20 and the like can be easily performed.

The plug guide 20 has a bypass hole 20.
When the plug 13 descends, the fluid accumulated in the space formed by the upper surface of the plug guide 20 and the guide hole 14 can be discharged from the bypass hole 20a to the outside when the plug 13 descends. Since the fluid serving as the resistance can be easily removed, the effect of smoothly lowering the plug 13 can be obtained.

In the second embodiment, the plug guide 20 and the lower lid 23 are described as being formed separately, but the plug guide 20 and the lower lid 23 are joined together by welding or the like. Alternatively, a part of the plug guide 20 may be formed in a shape like the lower lid 23 so that the lower lid 23
It may be configured as one member having both functions.

Embodiment 3 FIG. 3 is a vertical sectional view showing a valve device according to Embodiment 3 of the present invention. In the figure, reference numeral 25 denotes an axial plug guide formed so as to be able to engage with a guide hole 14 of a plug 13. Is inserted through a gasket 22 into a plug guide mounting hole 21 provided in the connector. Reference numeral 26 denotes a bypass hole provided in the plug 13 to allow communication between the inside and the outside of the guide hole 14 of the plug 13. That is, this bypass hole 26
When the plug 13 descends, the fluid that is accumulated in the space formed by the upper surface of the plug guide 25 and the guide hole 14 is discharged out of the space, thereby excluding the fluid that becomes a pressure resistance at the time of descending. , For smoothly lowering the plug 13. That is, in the second embodiment, the bypass hole for removing the fluid is provided in the plug guide 20, whereas the third embodiment is different in that the bypass hole is provided in the plug 13. Other configurations are the same as those in the second embodiment, and thus the same portions are denoted by the same reference characters and description thereof will be omitted.

Next, the operation will be described. The operation of moving the plug 13 up and down and effectively preventing fluid leakage when the plug 13 is closed are the same as in the second embodiment. The difference is that when the plug 13 descends, the fluid that accumulates in the space formed by the upper surface of the plug guide 25 and the guide hole 14 is discharged out of the space through the bypass hole 26 and the pressure at the time of descending is reduced. The point is that the fluid acting as a resistance is eliminated.

As described above, according to the third embodiment, the same effect as that of the second embodiment can be obtained by providing the plug guide 25, and the bypass hole 26 is provided in the plug 13. Thereby, when the plug 13 descends, the fluid that accumulates in the space defined by the upper surface of the plug guide 25 and the guide hole 14 can be discharged out of the space from the bypass hole 26, and the fluid that acts as a pressure resistance when descending Can be easily eliminated, and the effect of smoothly lowering the plug 13 can be obtained.

Embodiment 4 FIG. The fourth embodiment is different from the first to third embodiments in that the surface (engagement surface) of the guide portion 15b of the plug guide 15 and the surface of the insertion portion of the plug guide 20 and the plug guide 25 into the guide hole 14 (the engagement surface). (A mating surface) or an engaging surface of the guide hole 14 is provided with a lubricant (not shown) for reducing friction during sliding. That is, for example, a lubricant such as PTFE is applied to the above-mentioned portion. In addition,
The lubricant may be applied to both the plug guide 15 and the guide hole 14.

Next, the operation will be described. The operation is the same as in the above-described first to third embodiments. The difference is that the lubricant applied to the plug guides 15, 20, 25 reduces friction with the guide holes 14, and the sliding of the plug 13 is further improved. It is a point to be smooth.

As described above, according to the fourth embodiment, the plug guides 15 and
By applying a lubricating agent such as Teflon to 20, 25, the same effects as in the first to third embodiments can be obtained, and the plug guides 15, 20, 25 and the guide holes 14 can be obtained.
And the sliding of the plug 13 can be further smoothed, so that the effect of effectively preventing damage due to friction of the plug guides 15, 20, 25 and the guide hole 14 can be obtained.

[0035]

As described above, according to the first aspect of the present invention, the main body having the conduit to be opened / closed, the main body having the guide hole , and the stem are connected. a plug was <br/> is, is formed to be engageable with the guide hole of the plug and a plug guide provided detachably near the bottom of the body, the body is taken plug guide in the bottom
Has a hole with a smaller diameter than this plug guide mounting hole
With a larger diameter than the tip part and the plug guide mounting hole
Said tip portion of a plug guide having a formed portion
With the plug inserted in the plug guide mounting hole
By moving the plug guide outwardly of the body
Since it is configured to removably provided to the maintainer
When leaving the plug inside the main unit when
Easy to remove only the id from the bottom of the body outward
And the thickness of the lower lid is reduced to allow
This has the effect of securing a working space .

According to the second aspect of the present invention, when the plug guide engages with the guide hole, a bypass for discharging a fluid accumulated in the space formed by the plug guide and the guide hole to the outside of the space. Since the hole is provided in the plug guide or the plug, it is possible to easily remove the fluid that becomes the pressure resistance when the plug is lowered, and to obtain a valve device that can smoothly lower the plug.

According to the third aspect of the invention, since the lubricating material is provided on at least one of the engagement surfaces of the plug guide and the guide hole, friction between the plug guide and the guide hole is reduced, and the plug slides. Therefore, there is an effect that a valve device capable of effectively preventing damage due to friction of the plug guide and the guide hole can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a valve device according to Embodiment 1 of the present invention.

FIG. 2 is a vertical sectional view showing a valve device according to Embodiment 2 of the present invention.

FIG. 3 is a vertical sectional view showing a valve device according to Embodiment 3 of the present invention.

FIG. 4 is a vertical sectional view showing a conventional valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2, 3 Pipeline 10 Stem 13 Plug 14 Guide hole 15, 20, 25 Plug guide 20a, 26 Bypass hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 1/00 F16K 31/00

Claims (3)

(57) [Claims] 1. A main body having a conduit to be opened and closed, and
A guide arranged in the main body to control opening and closing of the pipeline.
A plug having a through hole, and a plug connected to the plug.
Can be engaged with the stem that moves forward and backward and the guide hole of the plug
Formed so as to be detachable near the bottom of the main body.
Device with fixed plug guideAnd The main body has a plug guide mounting hole at its bottom.
And The plug guide is smaller than the plug guide mounting hole.
From the tip part formed in the diameter and the plug guide mounting hole
Also has a portion formed with a large diameter, Insert the tip of the plug guide into the plug guide mounting hole
By attaching the plug
Providing an id so as to be detachable outwardly of the main body
A valve device characterized by the above-mentioned. 2. A plug guide and the guide hole and the bypass <br/> scan holes for discharging the fluid accumulated in the space outside the space formed by the said plug guide and the guide hole when is engaged , said plug guide or valve device according to claim 1, characterized in that provided in the plug. 3. The valve device according to claim 1, wherein a lubricating material is provided on at least one engagement surface of the plug guide or the guide hole.