JP2518377Y2 - Pipe fitting valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for a pipe joint in which packing is attached to the outer peripheral groove of a truncated cone valve body for opening and closing the fluid passage by contacting and separating from a valve seat formed in the fluid passage of the pipe joint. Regarding the improvement of.

[0002]

2. Description of the Related Art Conventionally, in the valve of the above pipe joint,
The outer peripheral groove of the valve body is fitted with a packing having a single annular protrusion, and the packing urged forward by a spring provided in the fluid passage presses against the valve seat to close the fluid passage. The fluid passage is opened by retracting the spring against the elastic force of the spring.

[0003]

According to the valve of the above-mentioned pipe joint, since the pressure contact area of the packing with respect to the valve seat is large, it is necessary to apply a strong surface pressure to complete the seal.
In addition, if the packing is crushed too much, the packing will be overloaded and the seal itself will be affected, and the seal will be deteriorated. Therefore, the seal surface pressure is taken into consideration and a strong spring force is required. Further, when used for vacuum, the conventional valve has a limit in vacuum degree.

In view of the above points, the present invention aims to improve the sealing performance in terms of both pressure resistance and vacuum with a slight force without imposing an unreasonable load on the packing, and eventually contributes to the safety of the pipe joint. The present invention provides a valve for a pipe fitting.

[0005]

In order to achieve the above object, the present invention is directed to a valve for a pipe joint in which packing is attached to an outer peripheral groove of a truncated cone-shaped valve body which comes in contact with and separates from a valve seat formed in a fluid passage. The outer periphery of the packing has two annular projections of a first annular projection and a second annular projection from the tip side, and the first annular projection and the second annular projection use the packing for the valve body. When installed in the outer peripheral groove, an extension line L- of the valve seat facing surface of this valve body
The top of the first annular protrusion is higher than the top of the second annular protrusion based on L ′, and the radius of curvature of the second annular protrusion in the cross-sectional shape is larger than the radius of curvature of the first annular protrusion. did.

[0006]

According to the present invention, when the valve is moved in the valve seat direction and the packing mounted in the outer peripheral groove of the valve body is pressed against the valve seat, the first annular projection on the tip side formed on the outer circumference of the packing is The fluid passage is sealed by being crushed and deformed so as to fill the annular groove formed between the second annular protrusion on the rear end side. Further, since the second annular protrusion is also crushed and sealed by the valve seat, the pressure contact portion of the packing with the valve seat is doubled and the sealing performance is improved. Even if one of the two annular protrusions or a part of the valve seat is damaged or the seal surface pressure is lowered, either one of the annular protrusions prevents the fluid from leaking.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention, in which 1 is a valve provided in a fluid passage of a pipe joint for opening and closing the fluid passage, 2 is a truncated cone valve body of the valve 1, and 3 is a valve. This is an outer peripheral groove formed in the body 2, and the outer peripheral groove 3 is fitted with a packing 4 which presses against the valve seat to seal it. In the packing 4, two annular projections 5 of a first annular projection 5a and a second annular projection 5b are formed on the outer periphery from the tip side. In the packing 4, the first annular protrusion 5a and the second annular protrusion 5b formed on the outer periphery of the outer peripheral groove 3 of the valve body 2 are extended lines L- of the valve seat facing surface 6 of the valve body 2.
The groove bottom of the annular groove portion 7 protruding outward from L ′ and formed between the first annular protrusion portion 5a and the second annular protrusion portion 5b of the packing 4 is located inside the extension line LL ′. It is installed to do. Further, the first annular projection 5a and the second annular projection 5b of the packing 4 mounted in the outer peripheral groove 3 of the valve body 2 are also provided.
Is based on the extension line L-L 'of the valve seat facing surface 6 of the valve element 2, the top of the first annular projection 5a is higher than the top of the second annular projection 5b, and the second annular The radius of curvature of the protrusion 5b is larger than the radius of curvature of the first annular protrusion 5a.

FIG. 2 shows an example of a pipe joint incorporating the valve 1 shown in the above embodiment. 8 is a socket, 9 is a fluid passage, 10 is a valve seat formed on the fluid passage 9, and 11 is a valve 1. Is a spring for urging the valve seat 10 toward the valve seat 10. When the socket 8 is not connected to the plug (not shown), the valve 1 is urged by the spring 11 to move forward, and the packing 4 mounted on the outer peripheral groove 3 of the valve body 2 is attached to the valve seat 10. The pressure is applied to close the fluid passage 9 of the socket 8. Valve seat 1
When the packing 4 is pressed against 0, the first annular projection 5a formed on the outer periphery of the packing 4 is crushed to form the annular groove 7 formed between the first annular projection 5a and the second annular projection 5b on the rear end side. The fluid passage 9 is sealed by deforming so as to be filled, and the second annular protrusion 5b is also crushed by the valve seat 10. Moreover, of the two annular protrusions 5 formed on the outer periphery of the packing 4, the second annular protrusion 5b located directly on the rear end side, that is, on the fluid passage 9 side and directly receiving the fluid pressure has a large radius of curvature. , And the radius of curvature of the first annular protrusion 5a located on the tip side is equal to the second radius.
Since it is smaller than the annular protrusion 5b, but the top is formed higher than the second annular protrusion 5b, the first annular protrusion 5a and the second annular protrusion 5b are evenly pressure-contacted when pressed against the valve seat 10. Is formed.

As described above, according to the above-described embodiment, since the valve seat 10 is sealed by the two annular protrusions 5 when the packing 4 is pressed against the valve seat 10, the annular protrusion 5 of the packing 4 is simply sealed. Alternatively, even if a part of the valve seat 10 is damaged, one of the annular protrusions 5 acts to prevent the fluid from leaking. Further, when used as a vacuum pipe joint, even if the surface pressure of the second annular protrusion 5b on the rear end side, that is, the vacuum side is reduced by the suction force, the deformation amount of the first annular protrusion 5a on the front end side is reduced. The large size maintains the seal and maintains a high degree of vacuum compared to valves in conventional fittings.

Although FIG. 2 shows an example in which the valve 1 shown in FIG. 1 is built in the socket 8, it goes without saying that the valve 1 can be incorporated in a plug.

[0011]

As described above, according to the valve of the pipe joint of the present invention, when the valve is closed, it is sealed by the two annular projections of the packing attached to the valve body, so that the valve seat is not easily sealed. Since it is dramatically improved, the integrity of the seal can be achieved, and since it is a double seal, even if one annular protrusion is scratched, the other annular protrusion seals and the fluid leakage is more reliable. Can be prevented and even if the valve is pulled to the spring side during vacuum, the second end on the rear end side
Since the deformation amount of the first annular protrusion on the tip side of the annular protrusion is larger than that of the annular protrusion, there is an effect that the seal is maintained and a high vacuum is obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a valve according to the present invention.

FIG. 2 is a vertical sectional side view showing a socket of a pipe joint having the valve shown in FIG. 1 built therein.

[Explanation of symbols]

 1 valve 2 valve body 3 outer peripheral groove 4 packing 5 annular protrusion 5a first annular protrusion 5b second annular protrusion 6 valve seat facing surface

Claims (1)

(57) [Scope of utility model registration request] 1. A valve of a pipe joint in which a packing is mounted in an outer peripheral groove of a truncated cone valve body that is brought into contact with and separated from a valve seat formed in a fluid passage, and a first outer periphery of the packing is provided from a front end side.
It has two annular projections, an annular projection and a second annular projection, and the first annular projection and the second annular projection have the same structure when the packing is attached to the outer peripheral groove of the valve. Extension line L of the valve seat facing surface
The top of the first annular protrusion is higher than the top of the second annular protrusion based on −L ′, and the radius of curvature of the second annular protrusion in the cross-sectional shape is greater than the radius of curvature of the first annular protrusion. Largely formed pipe fitting valve.