JPS62261772A - Ball valve - Google Patents

Abstract

PURPOSE:To achieve a purpose without forming a groove in the seal member containing part of a body, by providing a seat ring, positioned adjacent to a spring member and making contact with a ball, and a stopper ring, positioned on the inner diameter side of an annular spring member. CONSTITUTION:A spring member 5 is formed with an annular notch pipe 3, in which a notch is provided throughout the overall length in the longitudinal direction of an annular pipe, and a coil spring 2, inserted in the notch pipe 3 throughout the overall length thereof. A stopper ring 7, situated on the inner diameter side of the spring member 5, serves as a stopper which prevents the occurrence of compressive deformation strain when an excessive compression load is applied on the spring member 5. A ball valve is provided at a seat ring 1 with a cylindrical projection and therefore, a body has no groove, resulting in simplification of a shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seal for a ball valve having a substantially spherical valve body. It particularly relates to ball valves with metal seals for use with high temperature fluids.

[Conventional technology]

In a ball valve, a passage is provided in the approximately spherical ball that is the valve body, and the passage through the ball communicates with the outlet and inlet of the main body, or the non-penetrating part of the ball closes them. The ball is rotated 90 degrees.

The ball is rotated by rotating a valve stem connected thereto and a handle (not shown) attached to the valve stem.

In this case, it is necessary to provide a sealing member between them so that the rotating ball is well sealed against the body and does not get wet.

In general ball valves, the sealing member is often a ring-shaped elastic seat ring made of resin.

However, when the internal fluid is a high-temperature fluid such as steam, it is difficult for a resin seat ring to maintain stable sealing performance over a long period of time due to the heat. Therefore, it is necessary to use a metal sealing member to maintain stable sealing performance even with the above-mentioned high-temperature fluid.

A number of proposals have been made regarding this sealing member, and a typical one is the sealing member disclosed in Japanese Utility Model Application Laid-Open No. 58-50360 and shown in FIG. 5. This sealing member is interposed between the ball 23 and the main body 20, is made of a thin metal plate, and is processed into a shape having elasticity and a sealing effect, and is, for example, a cylindrical sealing member.

Still another technique is a sealing member disclosed in Japanese Patent Application Laid-Open No. 57-1) 4068, as shown in FIG. 6 and described below.

That is, the metal seat ring 1 is provided on the ball side between the ball 23 and the main body 20 in contact with the ball 23, and the metal spring member 5 is sandwiched between the seat ring 1 and the main body 20 on the main body side of the seat ring 10. There is a seal member provided in this way. That is, this sealing member consists of a seat ring 1 and an elastic spring member 5. This spring member has a cylindrical tube 3 with a twist notch along its entire length in the longitudinal direction, and a coil spring 2 inserted into the tube over its entire length in the longitudinal direction. At this time, the axis of the tube and the axis of the coil spring are aligned. Here, the spring member is compressed by the pressing force of the ball, and when the fluid pressure used by the ball valve is high, the compressed length is large.

Therefore, it is necessary to provide a stopper to regulate the compression length, and this stopper 6 is provided by forming a protrusion on the flow path side of the seal member storage portion of the main body 20.

[Problem that the invention seeks to solve]

Forming such a stopper means providing a groove in the main body 20 to accommodate the spring member 5, and machining such a groove in the main body 20 is troublesome, takes a lot of man-hours, and complicates the shape of the main body. There were drawbacks.

An object of the present invention is to provide a ball valve with a simple shape in which no groove is formed in the sealing member storage portion of the main body.

[Means to solve the problem]

In order to achieve the above object, the present invention does not provide a groove in the main body and use it as a stopper, but instead provides a stopper ring on the inner diameter side of the spring member and uses it as a stopper. a main body having an inlet and an outlet communicating with the valve chamber; a ball having a through flow passage housed in the valve chamber of the main body; a valve stem connected to the ball and protruding outside the valve chamber of the main body; It consists of a substantially annular sealing member interposed between the main body around the inlet and the ball on both sides of the chamber, and by rotating the valve stem, the ball is rotated to connect the inlet and the outlet of the main body. In a ball valve that communicates through a passage through a ball or closes through a non-throughout part of a ball, the sealing member is in contact with the main body, and includes a spring member having a coil spring inserted inside a ring-shaped notched pipe, and a spring member that is connected to the spring member. It consists of a seat ring adjacent to and in contact with the ball, and a stopper ring located on the inner diameter side of the ring-shaped spring member.

〔Example〕

FIG. 1 is a longitudinal sectional view of a ball valve showing a first embodiment of the present invention. In FIG. 1, 20 is the main body of a ball valve, which has a through opening, with an inlet and outlet 21 on the right side and a valve chamber 22 on the left side. 23 is a substantially spherical ball housed in the valve chamber 22 of the main body 20, and has a ball passage passage 24. Reference numeral 25 denotes a valve stem connected to the ball 23 within the valve chamber 22 and projecting to the outside of the valve chamber. This valve stem 25 is a handle (not shown)
etc., and the ball 23 also rotates at the same time.

Reference numeral 27 is the main body, and is an end main body that is attached to the valve chamber side opening of the main body 20 and has an inlet and an inlet 28.

30 is the outer peripheral surface of the ball 23, the main body 20, and the end main body 2
This is a sealing member interposed between 7 and 7. This sealing member 30 has a substantially annular shape and has inlet and outlet ports 21.2 on both sides of the ball 23.
By being positioned substantially perpendicular to the central axis of the ball 230, the passage 24 through the ball 230 communicates the inlets 21 and 28, and the non-penetrating portion of the ball 23 closes the inlets 21 and 28. conduct.

Next, the second figure shows the details of the cross section around the seal member 30.
It is a diagram. In Figure 2, 23 is a ball and 20
is the main body. A metal seat ring 1 is brought into contact with both ends of the outer peripheral surface of the ball 23 with its inner peripheral surface. The metal seat ring 1 is ring-shaped, and its inner circumferential surface is an inclined surface along the outer circumferential surface of the ball 23 so that it can easily come into contact with the outer circumferential surface of the ball 23. The outer peripheral surface of the seat ring 1 is parallel to the inner wall of the inlet/outlet 21 of the main body 20, and both side surfaces of the seat ring 1 are perpendicular to the outer peripheral surface. Similarly, a ring-shaped spring member 5 is provided adjacent to the seat ring 1 on the side opposite to the ball side. The spring member 5 is
It consists of a ring-shaped notched tube 3 in which a notch is made over the entire length of the ring-shaped tube in the longitudinal direction, and a coil spring 2 inserted into the notched tube 3 over the entire length thereof. The side of this spring member 5 opposite to the seat ring 1 side contacts the inner wall of the main body 20. This inner wall forms a surface perpendicular to the central axis of the outlet 21 of the main body 20, and this surface and the surface of the outlet 21 are in contact with each other.

Here, as shown in FIG. 2, a stopper ring 7 is provided on the inner diameter side of the spring member 5.

This stopper ring 7 is a ring having a rectangular cross section, and its inner diameter is approximately the same as the inner diameter of the inlet and outlet ports 21 and 28 of the ball valve, and its width dimension is the same as the maximum compressible size of the spring member 5. This stopper ring 7
serves as a stopper to restrict compressive deformation strain when an excessive compressive load is applied to the spring member 5.

When the ball valve is closed when the working fluid pressure of the ball valve is high, a pressure load is applied to the ball 23 on the outlet side due to the fluid pressure, and the seat ring l and the spring member 5 receive this load. . At this time, the spring member 5 is not subjected to excessive compressive deformation strain by the stopper ring 7.

Since the ball valve according to this embodiment has a cylindrical projection on the seat ring 1, the main body does not have a groove and has a simple shape.

FIG. 3 shows a second embodiment of the present invention, in which the stopper ring 7 in the first embodiment is increased in width.

That is, a step is formed in the seat ring 1 and the main body 20 by an amount corresponding to the increase in the widthwise dimension of the stopper ring 7, and the stopper ring 7 is housed in this step. In this second embodiment as well, the same effects as in the first embodiment can be obtained.

FIG. 4 also shows the third embodiment, in which the widthwise dimension of the stopper ring 7 is made two steps: the widthwise dimension of the stopper ring in the first embodiment and the widthwise dimension of the stopper ring in the second embodiment. The shapes of the seat ring and the main body 20 in this case are the same as in the second embodiment shown in FIG. This also produces the same effect. Furthermore, there is a gap between the stopper ring 7 and the seat ring 1, and a gap between the stopper ring 7 and the main body 2.
Since there is a bend at one place in the gap between the flow path and the flow path, there is an effect that it is difficult for dirt and the like to enter the spring member from the flow path.

〔Effect of the invention〕

The ball valve according to the present invention has the advantage that the main body has no stopper for preventing excessive compressive deformation of the spring member, that is, there is no groove, so the shape is simple.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a ball valve showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the vicinity of the seal member in FIG. 1, and FIG. 3 is an enlarged sectional view of the vicinity of the seal member showing the second embodiment. 4 are enlarged sectional views showing the third embodiment, and FIGS. 5 and 6 are enlarged sectional views showing the vicinity of the conventional seal portion. Room material □□ Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A main body having a valve chamber, an inlet and an outlet communicating with the valve chamber, a ball having a through flow passage housed in the valve chamber of the main body, and a ball connected to the ball and protruding outside the valve chamber of the main body. a substantially annular sealing member interposed between the main body and the ball on both sides of the main body valve chamber and around the inlet/outlet, and the ball is rotated by rotating the valve stem. In a ball valve in which an inlet and an outlet of a main body are communicated with each other by a passage through a ball or closed by a non-penetrating part of the ball, the sealing member has a ball in contact with the main body and a coil inside a ring-shaped notched pipe. A ball valve comprising a spring member into which a spring is inserted, a seat ring adjacent to the spring member and in contact with a ball, and a stopper ring located on the inner diameter side of the ring-shaped spring member.