JPH0554874U - Resin valve body for butterfly valve - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a resin valve element for a butterfly valve having a valve element supporting strength capable of substantially replacing a metal valve element by compensating for the lack of material strength. A resin valve body integrally molded with a resin material such as PPS, wherein one valve shaft having a hexagonal cross section has a valve shaft hole 4 bored radially from both ends of a boss portion 3. 6 is formed in a through hole having a hexagonal cross section.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a resin valve body for a butterfly valve.

[0002]

[Prior Art]

 At present, the valve element for butterfly valves satisfies certain valve element strength and pressure resistance, except for the case where resin (FRP or vinyl chloride) is used for special purposes where chemical resistance is required. Metallic materials (stainless steel and brass) are commonly used.

5 to 8 show an example of a metal valve body incorporated in a butterfly valve that is generally applicable to flow rate control of a pipe flow path.

In this metal valve body 11, annular ribs 12, 12 are provided on both sides of a peripheral edge portion which is in sliding contact with a seat ring on the inner periphery of a valve body (valve box) not shown, and boss portions 13A provided at both upper and lower end portions, Valve shaft holes 14A, 14B are bored from 13B in the radial direction passing through the center of the valve body, and when mounting the valve body, as shown in FIG. 8, the valve shafts 16A, 16B are provided in the respective valve shaft holes 14A, 14B. Is attached and supported by a valve body (not shown) on the outer periphery so as to be swingable around an axis.

[0005]

[Problems to be solved by the device]

 However, the current metal valve discs have the following problems in terms of manufacturing and weight.

That is, this type of metal valve body is manufactured through a process of precision casting and a process of machining, but since the process is complicated and the number of steps is large, the productivity is inevitably low. The first problem is that physical costs are also relatively high. A second problem is that a metal valve body has a large specific gravity and a large valve body weight, which causes inconvenience in transportation of butterfly valves and work during installation in high places.

Therefore, it is conceivable to use a resin material that is easy to mold and has a small specific gravity as the valve element for the butterfly valve. However, if the resin material is resinized with the current valve element support structure as described above, the material strength is increased. However, it is not possible to secure the support strength of the valve body that can withstand use in general butterfly valve applications.

In order to cope with the above-mentioned problems of the present invention, the present invention is for a butterfly valve in which the valve body is substantially resinified by improving the mounting structure of the valve body on the valve body. The present invention provides a resin valve body.

[0009]

[Means for Solving the Problems]

 A resin valve body for a butterfly valve according to the present invention is a resin valve body integrally molded with a resin material such as PPS having high material strength and moldability, and has a valve shaft hole bored from both ends in a radial direction. Is formed in a through hole having a polygonal cross section.

[0010]

[Action]

 In this resin valve body, the valve body can be supported by the valve shaft hole having the polygonal cross section corresponding to the valve shaft hole through the valve shaft hole penetrating both ends thereof in the radial direction. Then, by penetrating one valve shaft having a cross-sectional shape corresponding to the valve shaft hole having a polygonal cross-section, torque transmission from the valve shaft to the valve body at the time of opening / closing the valve body is smoothly performed, and The fluid pressure applied to the valve body can be supported on the valve shaft to reinforce the resin valve body.

[0011]

【Example】

 1 to 4 illustrate an embodiment of a butterfly valve resin valve body, which is compared with the conventional example (FIGS. 5 to 8).

The resin valve body 1 is provided with annular ribs 2, 2 on both sides of the peripheral edge portion, and at the center of the valve body is provided a boss portion 3 continuous to the upper and lower end portions in the radial direction. A valve shaft hole 4 bored in the radial direction from both ends of 3 is formed in a through hole having a hexagonal cross section that vertically penetrates the valve body 1. Further, lateral ribs 5A and 5B in a direction orthogonal to the newly added valve shaft hole 4 are provided at vertically symmetrical positions on both surfaces of the resin valve body 1 in the vicinity of both upper and lower ends.

The resin valve body 1 is integrally molded by injection molding or the like with the resin material including the valve shaft hole 4 having a hexagonal cross section. As the valve body molding material, PPS (polyphenylene sulfide), which has good moldability and is excellent in rigidity, heat resistance, chemical resistance, dimensional stability, etc., is preferred.

In this resin valve body 1, as shown in FIG. 4, a valve shaft 6 having a hexagonal cross section corresponding to the valve shaft hole 4 is passed through a valve shaft hole 4 penetrating both ends of the boss portion 3. It can be supported by a valve body (not shown). That is, while the conventional metal valve body 11 is locally supported at both ends by two vertically separated valve shafts 16A and 16B, in the resin valve body 1, the valve shaft hole 4 is A single valve stem 6 having a corresponding hexagonal cross-section will be pierced and supported in engagement in the rotational direction.

By adopting the above-mentioned support structure, the torque is smoothly transmitted from the valve shaft 6 to the valve body 1 when the valve body is opened and closed, and the fluid pressure applied to the valve body 1 is received by the valve shaft 6. Since it can be supported by being supported, it is possible to provide the valve body 1 with sufficient strength to compensate for the decrease in material strength in combination with the rigidity increase of the valve body itself due to the addition of the lateral ribs 5A and 5B. It will be possible. In other words, since the reinforcing effect of the valve shaft 6 is added, it is possible to provide a resin valve body having a supporting strength that substantially compensates for the lack of strength of the valve body material.

The lateral ribs 5A and 5B provided on both sides of the valve body 1 can easily contribute to increasing the rigidity of the valve body 1 by being simultaneously molded at the time of molding the valve body, and moreover, when the valve is in use. , Since it is arranged in the direction parallel to the streamline, the increase of the fluid resistance due to the addition of the ribs will be small. The lateral ribs 5A and 5B can be omitted in a valve application where the fluid pressure is small.

In addition, the valve shaft hole 4 provided through the boss portion 3 of the valve body 1 can be formed by a rectangular pipe part that is inserted at the time of forming.

[0018]

[Effect of the device]

 As described above, in the resin valve element for butterfly valves according to the present invention, the valve element is inserted into the valve shaft hole of the polygonal cross section through the valve shaft hole of the polygonal cross section that is radially penetrated from both ends. Since it is possible to reinforce the valve body, it is possible to compensate for the decrease in the strength of the valve body material and to secure the strength of the valve body that can withstand general uses of butterfly valves. With the provision of the resin valve body that can be substantially replaced in terms of strength, the problems pointed out in the conventional metal valve body can be solved. That is, the problem that the productivity of the valve body is low and the cost of the valve body is high is solved, and the weight of the valve body reduces the transportation of the valve and the convenience of installation at high places.

[Brief description of drawings]

FIG. 1 is a front view of a resin valve element for a butterfly valve showing an embodiment.

FIG. 2 is a transverse cross-sectional view of the central portion of FIG.

FIG. 3 is a side view of a half section of FIG. 1.

4 is a perspective view showing an outline of a valve shaft mounting state of the butterfly valve of FIG. 1. FIG.

FIG. 5 is a front view of a metal valve element for a butterfly valve showing a conventional example.

6 is a transverse cross-sectional view of the central portion of FIG.

7 is a side view of the half section of FIG.

8 is a perspective view showing an outline of a valve shaft mounting state of the butterfly valve of FIG.

[Explanation of symbols]

 1 Resin Valve Body for Butterfly Valve 2 Annular Rib 3 Boss Section 4 Valve Shaft Hole 5A, 5B Lateral Rib 6 Valve Shaft 11 Metal Valve Body for Butterfly Valve 12 Annular Rib 13A, 13B Boss Section 14A, 14B Valve Shaft Hole 16A, 16B Valve axis

Claims (1)

[Scope of utility model registration request] 1. A butterfly valve, which is a resin valve body integrally molded of a resin material, wherein valve shaft holes formed in the radial direction from both ends are formed in through holes having a polygonal cross section. Resin valve body.