JPH064475U - Swing type check valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the waterproofness by improving the adhesion of the valve body packing to the valve seat in a swing check valve. [Structure] In a swing type check valve 10 in which a packing 17 provided in a packing mounting portion 16 of a valve body 12 can be brought into contact with and separated from a valve seat 14, the valve body 12 has a valve seat 1 in a valve housing 11.
4. A through hole 18 that communicates with the packing mounting portion 16 from the valve body rear surface facing the flow path 13A downstream of 4 to the packing mounting portion 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a swing check valve.

[0002]

[Prior art]

 The swing check valve includes a valve box having a flow passage, and a valve body that is swingably supported in the valve box and that opens and closes the flow passage by contacting and separating from a valve seat provided around the flow passage of the valve box. The packing provided on the packing mounting portion of the valve body can be brought into and out of contact with the valve seat. As a result, in the swing type check valve, the check valve of the hydraulic pressure generated in the flow passage on the downstream side of the valve seat in the valve box presses the valve body packing, and Water is being stopped in the side flow path.

[0003]

[Problems to be solved by the device]

 However, if there are small irregularities on the surface of the valve body where the packing is attached, the surface of the packing, or the surface of the valve seat, the packing is not evenly pressed against the valve seat, resulting in poor sealing between the packing and the valve seat. However, the water stopping property is reduced.

In particular, when a synthetic resin such as PTFE is used as the packing material in order to secure the liquid resistance of the packing against a chemical solution, etc., the packing has a high hardness and the deformability of the packing to follow the valve seat is low. Therefore, the above-mentioned decrease in water blocking property becomes remarkable.

An object of the present invention is to improve the water stopping property by improving the adhesion of the valve body packing to the valve seat in the swing type check valve.

[0006]

[Means for Solving the Problems]

 The present invention according to claim 1 is a valve box having a flow path, and a valve seat supported swingably in the valve box and opened and closed by contacting with and separating from a valve seat provided around the flow path of the valve box. In a swing check valve in which the packing provided in the packing mounting portion of the valve body can be brought into and out of contact with the valve seat, the valve body is located downstream of the valve seat in the valve box. The through hole is provided so as to communicate from the valve body rear surface facing the side flow passage to the packing mounting portion.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, an annular continuous groove is provided at a position corresponding to the valve seat in the packing mounting portion of the valve body. It was done like this.

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, a ring-shaped continuous ridge portion is provided at a portion of the packing which contacts the valve seat. It is a thing.

According to a fourth aspect of the present invention, in the present invention according to the third aspect, the through hole provided in the valve body and the ridge portion provided in the packing are arranged so as to correspond to each other. It was done.

[0010]

[Action]

 According to the present invention as set forth in claim 1, the following effects are obtained. The valve body is provided with a through hole that communicates with the packing mounting portion from the valve body back surface that faces the flow path downstream of the valve seat in the valve box. Therefore, the check pressure generated in the flow passage on the downstream side of the valve seat in the valve box directly acts on the back surface of the packing through the through hole. Therefore, it is not affected by the unevenness of the surface of the packing mounting portion of the valve body. Further, since the check pressure directly acts on the packing, the packing can be positively deformed following the valve seat and pressed against the valve seat. Therefore, even if there are small irregularities on the surface of the valve body on which the packing is attached, the surface of the packing, or the surface of the valve seat, the adhesion of the valve body packing to the valve seat can be improved, and the waterproof performance can be improved. .

According to the present invention as set forth in claim 2, there is the following action. An annular continuous groove was provided at a position corresponding to the valve seat in the packing mounting portion of the valve body. Therefore, the check pressure generated in the flow passage on the downstream side of the valve seat in the valve box passes through the through-hole, fills the annular groove, and directly acts on the entire circumference of the back surface at the position corresponding to the valve seat of the packing. . Therefore, in the above, the check pressure acting on the packing can be equalized over the entire circumference of the packing, and the adhesion of the packing to the valve seat can be improved.

According to the present invention as set forth in claim 3, there is the following action. A ring-shaped continuous ridge is provided at the portion of the packing that contacts the valve seat. Therefore, it is possible to reduce the contact area between the packing and the valve seat, and to obtain a large surface pressure between the packing and the valve seat even under the action of a relatively small check pressure, and to improve the water blocking performance. Wear.

According to the present invention as set forth in claim 4, there is the following action. The through hole of the valve body and the ridge of the packing are arranged correspondingly. Therefore, the packing part on which the check pressure acts through the through hole becomes the ridge, and the check pressure is effectively used to increase the surface pressure between the packing and the valve seat, thereby improving the waterproofness. Can be improved.

[0014]

【Example】

 1 is a schematic diagram showing a first embodiment of the present invention, FIG. 2 is a schematic diagram showing a second embodiment of the present invention, and FIG. 3 is a schematic diagram showing a third embodiment of the present invention.

First Embodiment (See FIG. 1) The swing check valve 10 has a valve box 11 and a valve body 12. The valve box 11 is provided with a flow passage 13 and a valve seat 14 is provided around the flow passage 13.

The valve body 12 is swingably supported in the valve box 11 via a support shaft 15, and contacts and separates from the valve seat 14 to open and close the flow path 13.

At this time, in the swing check valve 10, the packing 17 provided on the annular packing mounting portion 16 of the valve body 12 can be brought into contact with and separated from the valve seat 14. As the packing 17, a synthetic resin such as PTFE having high liquid resistance to a chemical liquid or the like can be used.

However, the valve body 12 is provided with a through hole 18 that communicates with the packing mounting portion 16 from the back surface of the valve body facing the downstream passage 13 A from the valve seat 14 in the valve box 11. The through holes 18 are provided at a plurality of positions in the circumferential direction of the valve body 12 at regular intervals.

Next, the operation of the first embodiment will be described. The valve body 12 includes a through hole 18 that communicates with the packing mounting portion 16 from the back surface of the valve body facing the flow passage 13A on the downstream side of the valve seat 14 in the valve box 11. Therefore, the check pressure generated in the flow passage 13A on the downstream side of the valve seat 14 in the valve box 11 directly acts on the back surface of the packing 17 through the through hole 18. Therefore, it is not affected by the unevenness of the surface of the packing mounting portion 16 of the valve body 12. Further, since the check pressure directly acts on the packing 17, the packing 17 can be positively deformed following the valve seat 14 and pressed against the valve seat 14. Therefore, even if there are small irregularities on the surface of the packing mounting portion 16 of the valve body 12, the surface of the packing 17, or the surface of the valve seat 14, the adhesion of the packing 17 to the valve seat 14 is improved, and the waterproof property is improved. can do.

(Second Embodiment) (See FIG. 2) The second embodiment differs from the first embodiment in that a ring shape is formed at a position corresponding to the valve seat 14 in the packing mounting portion 16 of the valve body 12. This is because a continuous groove 21 is provided. The cross-sectional shape of the groove 21 may be a semicircle, a triangle, a quadrangle, or the like.

The operation of the second embodiment will be described below. An annular groove 21 is provided in the packing mounting portion 16 of the valve body 12 at a position corresponding to the valve seat 14. Therefore, the check pressure generated in the flow path 13A on the downstream side of the valve seat 14 in the valve box 11 passes through the through-hole 18 and is filled in the annular groove 21 so that the check pressure is directly applied to the valve seat 14 of the packing 17. It works on the entire circumference of the back. Therefore, the non-return pressure acting on the packing 17 in the above can be equalized over the entire circumference of the packing 17, and the adhesion of the packing 17 to the valve seat 14 can be improved.

It should be noted that a plurality of grooves 21 may be provided as long as they are provided within a range that does not deviate from the surface of the valve seat 14.

(Third Embodiment) (See FIG. 3) In the third embodiment, in addition to the first embodiment and the second embodiment, an annular continuous ridge portion is provided on a portion of the packing 17 which is in contact with the valve seat 14 31 is provided. The cross-sectional shape of the protrusion 31 may be a semi-circle, a triangle, a quadrangle, or the like.

The operation of the third embodiment will be described below. An annular continuous ridge portion 31 is provided at a portion of the packing 17 that contacts the valve seat 14. Therefore, the contact area between the packing 17 and the valve seat 14 can be reduced, and a large surface pressure can be obtained between the packing 17 and the valve seat 14 even under a relatively small check pressure action, thereby improving the water blocking performance. be able to.

It should be noted that the above-mentioned protrusion 31 must have a perfect annular shape, but it may be scratched due to the inclusion of foreign matter during use, resulting in an incomplete annular shape, which may impair the waterproofness. For this reason, a plurality of ridges 31 may be provided.

Fourth Embodiment The fourth embodiment is different from the third embodiment in that the through hole 18, the annular groove 21 provided in the valve body 12 and the ridge portion 31 provided in the packing 17 are arranged correspondingly. It was made to be done.

The operation of the fourth embodiment will be described below. The through hole 18 and the annular groove 21 included in the valve body 12 and the ridge portion 31 included in the packing 17 are arranged correspondingly. Therefore, the packing portion on which the check pressure acts through the through hole 18 and the annular groove 21 is used as the ridge portion 31, and the check pressure is effectively utilized so that the packing 17 and the valve seat 14 can be effectively separated from each other. It is possible to increase the surface pressure between them and improve the waterproofness.

[0028]

[Effect of device]

 As described above, according to the present invention, in the swing-type check valve, the adhesion of the valve body packing to the valve seat can be improved, and the water blocking performance can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of the present invention.

FIG. 2 is a schematic view showing a second embodiment of the present invention.

FIG. 3 is a schematic view showing a third embodiment of the present invention.

[Explanation of symbols]

 10 Swing-type check valve 11 Valve box 12 Valve body 13 Flow path 14 Valve seat 16 Packing attachment part 17 Packing 18 Through hole 21 Annular groove 31 Projection part

Claims (4)

[Scope of utility model registration request] 1. A valve box having a flow path, and a valve body swingably supported in the valve box and contacting and separating a valve seat provided around the flow path of the valve box to open and close the flow path. In the swing type check valve in which the packing provided in the packing mounting portion of the valve body can be brought into and out of contact with the valve seat, the valve body facing the flow passage downstream of the valve seat in the valve box. A swing type check valve comprising a through hole that communicates from the back surface to the packing mounting portion. 2. The swing type check valve according to claim 1, wherein an annular continuous groove is provided at a position corresponding to the valve seat in the packing mounting portion of the valve body. 3. The swing type check valve according to claim 1, wherein an annular continuous protrusion is provided at a portion of the packing which is in contact with the valve seat. 4. The swing check valve according to claim 3, wherein the through hole provided in the valve body and the ridge portion provided in the packing are arranged corresponding to each other.