JPH094728A - Valve - Google Patents

Abstract

PURPOSE: To provide a valve capable of preventing leakage, even if the valve seat is dislocated with regard to the valve stem or the strain of the valve stem is caused. CONSTITUTION: A valve body 7 is held by a valve stem 9 through a retaining member 8, and the retaining member 8 is made up of a first retaining body 13 that has been externally fitted to the valve stem 9 in a loosed condition, and a second retaining body 14 that has been externally fitted to the valve stem 9 in a loosed condition for engaging with the first retaining body 13 from the outside. A stopper 19 for preventing the first retaining body 13 from being slipped out is provided to the end of the valve stem 9, and the second retaining body 14 is fitted to the valve body 7, and a plate spring 29 that is expansible in the open/close direction of the valve body 7 is interposed between the first retaining body 13 and the stopper 19, and a first spherical part 24 is formed on the outer circumferential surface of the first retaining body 13, and a second spherical part 25 is formed on the inner circumferential surface of the second retaining body 14 so that it can be slidably superimposed on the first spherical part 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle valve and a ball provided with a valve body which opens and closes in a valve box in a direction perpendicular to a closing surface formed on a valve seat by the withdrawal and retreat of a valve rod. Regarding shaped valves.

[0002]

2. Description of the Related Art Conventionally, an angle valve shown in FIG. 7 is an example of this type of valve. That is, the valve box
Inside 41, a valve seat 42 and a valve body 44 that opens and closes perpendicularly to a closing surface formed on the valve seat 42 are provided, and the valve body 44 is provided at the tip of a valve rod 45. It is fixed and installed.

[0003]

However, in the above-mentioned conventional type, when the fluid on the upstream side A of the valve element 44 is low temperature and high pressure and the fluid on the downstream side B is high temperature and low pressure, the valve seat 42 is attached to the valve stem 45. On the other hand, lateral displacement occurs, which causes a displacement between the valve body 44 and the valve seat 42, resulting in poor engagement between the seat surface 46 of the valve body 44 and the seat surface 47 of the valve seat 42 and leakage. There was such a problem.

Further, the valve rod 45 is distorted and the valve rod 45 is bent, so that the valve body 44 is inclined with respect to the valve seat 42, and the valve body 44
There is also a problem in that the seat surface 46 of the valve seat 42 and the seat surface 47 of the valve seat 42 are not properly meshed with each other to cause leakage.

The present invention solves the above-mentioned problems, and even when the valve seat is displaced with respect to the valve stem or the valve stem is distorted,
It is an object of the present invention to provide a valve capable of preventing leakage.

[0006]

In order to solve the above problems, the valve according to the present invention has an opening and closing operation perpendicular to the closing surface formed in the valve seat due to the withdrawal of the valve rod in the valve box. Is provided on the valve rod via a holding member, and the holding member is attached to the first holding member externally fitted with the valve rod having a play and the valve rod. A second externally fitted state having a play and engaging with the first holding body from the outside
And a retainer, and a tip of the valve rod is provided with a retainer having a diameter larger than that of the valve rod for preventing the first retainer from being removed.
A valve body is attached to the second holding body, and an elastic body that is elastically deformable in the opening / closing direction of the valve body is interposed between the first holding body and the retaining member, and an outer peripheral surface of the first holding body is provided. A first spherical surface portion is formed on the inner peripheral surface of the second holding body, and a second spherical surface portion is formed on the inner peripheral surface of the second holding body so as to be slidably overlapped with the first spherical surface portion.

[0007]

According to the above construction, when the valve seat is displaced laterally with respect to the valve rod while the valve body is closed, the valve body slides in the displacement direction together with the valve seat, and further, together with the valve body, the first holding body. And the second holding body slides in the shift direction. At this time, the gap between the valve rod and the first holding member in the direction of displacement and the valve rod
The gap on the side of the shift direction with the holding body expands, and the gap on the side opposite to the direction of the shift between the valve rod and the first holding body and the gap on the side opposite to the direction of the shift between the valve rod and the second holding body narrow. , The lateral displacement of the valve seat with respect to the valve rod is absorbed by the holding member,
The valve body does not shift laterally with respect to the valve seat. This prevents leakage from between the seat surface of the valve body and the seat surface of the valve seat.

When the valve rod is distorted when the valve rod is closed and the valve rod is bent, the elastic body is deformed to absorb the bending of the valve rod. Further, when the elastic body cannot completely absorb, the first spherical surface portion slides on the second spherical surface portion according to the bending of the valve rod, and the first holding body is angularly displaced with respect to the second holding body. Therefore, the bending of the valve rod is absorbed by the holding member, and the valve body does not shift. This prevents leakage from between the seat surface of the valve body and the seat surface of the valve seat.

Further, even when the displacement of the valve seat and the strain of the valve rod occur at the same time as described above, the displacement of the valve seat and the strain of the valve rod can be absorbed by the holding member in the same manner as described above. it can.

Further, even if the valve body is misaligned or bent with the valve body opened, the holding member acts in the above-described manner in the process of closing the valve body by the closing operation, so that the valve body seat is gradually opened. The surface and the valve seat seat surface mesh with each other to prevent leakage.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, reference numeral 1 is an angle valve, and a valve box 2 thereof is provided with a fluid inlet 3 and an outlet 4. Inside the valve box 2, a valve box flow path 5, a cylindrical valve seat 6 and a valve body 7 are provided. The valve body 7
Is held at one end of a valve rod 9 which can be retracted in the axial direction via a holding member 8 and is opened / closed perpendicularly to a closing surface 10 formed on the valve seat 6. Further, the other end side of the valve rod 9 is connected to a drive device (not shown) which projects from the valve box 2 to the outside and moves the valve rod 9 back and forth.

As shown in FIGS. 1, 3 and 4, the holding member 8 has a first holding body 13 fitted on the valve rod 9 in a state where the valve rod 9 has a play, and a play in the valve rod 9. A second holding body that is externally fitted in the held state and engages with the first holding body 13 from the outside.
It is composed of 14 and. That is, the first holder 13
A gap 16 is formed over the entire circumference between the first holding hole 15 formed in and the valve rod 9 fitted in the first holding hole 15.
Similarly, a gap 18 is formed between the second holding hole 17 formed in the second holding body 14 and the valve rod 9 fitted in the second holding hole 17.
Are formed over the entire circumference.

Further, at one end of the valve rod 9, a first holding body is provided.
Disc-shaped stopper with a larger diameter than the valve rod 9 to prevent the 13 from coming off
19 are installed. The retainer 19 is fastened to one end of the valve rod 9 via a male screw formed on the valve rod 9 and a screw formed on the retainer 19. Also, the above retaining
The reference numeral 19 is fitted in the widening portion 20 formed in the first holding body 13 in a state where it has some play. That is, the widening part
A gap 21 is formed over the entire circumference between 20 and the retainer 19 fitted in the expanded portion 20.

A first spherical surface portion is formed on the outer peripheral surface of the first holding body 13.
24 are formed. In addition, a second spherical surface portion that slidably overlaps the first spherical surface portion 24 on the inner peripheral surface of the second holding body 14.
25 are formed.

The valve body 7 is attached to the second holding body 14 by a plurality of screws 26. Inclined seat surfaces 27 and 28 are formed on the valve body 7 and the tip of the valve seat 6, respectively. Further, between the first holding body 13 and the retaining member 19, a ring-shaped leaf spring 29 that is expandable and contractable in the opening / closing direction of the valve body 7 is provided.
(One example of an elastic body) is interposed. The leaf spring 29 urges the first holding body 13 in a direction in which it is separated from the retainer 19.

The operation of the above structure will be described below.
By moving the valve body 7 in the closing direction via the valve rod 9, the seat surface 27 of the valve body 7 meshes with the seat surface 28 of the valve seat 6, and the valve box flow path 5 is closed.

In this state, as shown in FIG. 5, when the valve seat 6 is displaced in the lateral direction X with respect to the valve rod 9, the valve body 7 slides in the displacement direction together with the valve seat 6, and the valve body 7 is further displaced. At the same time, the first holding body 13 and the second holding body 14 slide in the shift direction. At this time, the gaps 16, 18, and 21 on the shift direction side expand,
Since the gaps 16, 18, 21 on the side opposite to the shift direction are narrowed,
The shift of the valve seat 6 in the lateral direction X with respect to the valve rod 9 is absorbed by the holding member 8, and the valve body 7 does not shift laterally with respect to the valve seat 6. As a result, the seat surface 27 of the valve body 7 and the valve seat 6
The engagement with the seat surface 28 does not shift, and leakage from both seat surfaces 27, 28 can be prevented.

Further, as shown in FIG. 6, when the valve rod 9 is distorted and bent, the leaf spring 29 expands and contracts to absorb the bending of the valve rod 9. Further, when the leaf spring 29 cannot absorb the full amount, the first spherical surface portion is bent depending on the bending of the valve rod 9.
24 slides on the second spherical surface portion 25, and the first holding body 13 is the second holding body.
Since the valve rod 9 is angularly displaced with respect to 14, the bending of the valve rod 9 is absorbed by the holding member 8 and the valve body 7 is not displaced. As a result, the seat surface 27 of the valve body 7 and the seat surface 28 of the valve seat 6 are not disengaged from each other, and leakage from both seat surfaces 27, 28 can be prevented.

Further, even when the displacement of the valve seat 6 and the strain of the valve rod 9 occur at the same time as described above, similarly to the above,
Both the displacement of the valve seat 6 and the strain of the valve rod 9 can be absorbed by the holding member 8.

Further, even if the valve body 7 is misaligned or bent with the valve body 7 opened, the holding member 8 acts in the above-described manner in the process of closing the valve body 7 by closing the valve body 7, and thus the holding member 8 gradually operates. The seat surface 27 of the valve body 7 and the seat surface 28 of the valve seat 6 mesh with each other to prevent leakage.

When the valve rod 9 expands or contracts due to heat change or the like while the valve body 7 is closed, the leaf spring 29 is correspondingly moved.
By expanding and contracting in the axial direction of the valve rod 9, expansion and contraction of the valve rod 9 can be absorbed.

By moving the valve body 7 in the opening direction via the valve rod 9, the seat surface 27 of the valve body 7 is separated from the seat surface 28 of the valve seat 6 in the vertical direction, and the valve box flow path 5 Is released. At this time, since the leaf spring 29 expands, the first holding body 13 is pushed and moves in a direction away from the retainer 19, whereby the first holding body 13 is pressed against the second holding body 14, and the valve Body 7
Is pressed against retainer 19. Therefore, it is possible to prevent fluctuation of the valve body 7 due to the fluid when the valve body 7 is opened.

Further, as shown in FIG. 1, the biasing force of the leaf spring 29 can be adjusted by increasing or decreasing the screwing amount of the retainer 19 to the valve rod 9. Although the leaf spring 29 is used as an example of the elastic body in the above-described embodiment, it may be a compression coil spring that can expand and contract in the opening / closing direction of the valve body 7.
Further, although the angle valve 1 is mentioned in the above-mentioned embodiment, it may be a globe valve.

[0024]

As described above, according to the present invention, when the valve seat is displaced laterally with respect to the valve rod with the valve body closed, the valve body slides in the displacement direction together with the valve seat, and The first holding body and the second holding body slide together with the valve body in the shift direction. At this time, the gap between the valve rod and the first holding body on the side of the shift direction and the gap between the valve rod and the second holding body on the side of the shift direction widen, and the gap on the side opposite to the shift direction between the valve rod and the first holding body is widened. And the gap on the side opposite to the displacement direction between the valve rod and the second holding body are narrowed, the lateral displacement of the valve seat with respect to the valve rod is absorbed by the holding member, and the valve body is displaced with respect to the valve seat. It does not shift laterally. This prevents leakage from between the seat surface of the valve body and the seat surface of the valve seat.

When the valve rod is distorted when the valve rod is closed and the valve rod is bent, the elastic body is deformed to absorb the bending of the valve rod. Further, when the elastic body cannot completely absorb, the first spherical surface portion slides on the second spherical surface portion according to the bending of the valve rod, and the first holding body is angularly displaced with respect to the second holding body. Therefore, the bending of the valve rod is absorbed by the holding member, and the valve body does not shift. This prevents leakage from between the seat surface of the valve body and the seat surface of the valve seat.

Further, even when the displacement of the valve seat and the strain of the valve rod occur at the same time as described above, the displacement of the valve seat and the strain of the valve rod can be absorbed by the holding member in the same manner as described above. it can.

Further, even if the valve body is misaligned or bent in the open state, the holding member acts in the above-described manner in the process of closing the valve body by closing the valve body, so that the valve body seat is gradually opened. The surface and the valve seat seat surface mesh with each other to prevent leakage.

[Brief description of drawings]

FIG. 1 is a sectional view showing a holding structure for a valve body and a valve rod of a valve according to an embodiment of the present invention.

FIG. 2 is a sectional view of the valve.

FIG. 3 is a cross-sectional view of a first holding body provided in the valve.

FIG. 4 is a cross-sectional view of a second holding body provided in the valve.

FIG. 5 is a cross-sectional view illustrating an operation of a holding member provided in the valve.

FIG. 6 is a cross-sectional view explaining the operation of a holding member provided in the valve.

FIG. 7 is a sectional view of a valve in a conventional example.

[Explanation of symbols]

 1 Angle valve 2 Valve box 6 Valve seat 7 Valve body 8 Holding member 9 Valve rod 10 Closing surface 13 First holding body 14 Second holding body 19 Retaining stopper 24 First spherical surface portion 25 Second spherical surface portion 29 Leaf spring (elastic body) )

Claims (1)

[Claims] 1. A valve body is provided in a valve box, which opens and closes by a valve rod to open and close in a direction perpendicular to a closing surface formed on a valve seat, and the valve body holds the valve member through a holding member. Held on a stick,
The holding member is externally fitted with the valve rod having play, and is externally fitted with the valve rod having play, and engages with the first holding body from the outside. A second retainer is provided, and a stopper having a diameter larger than that of the valve rod for preventing the first retainer from being removed is provided at the tip of the valve retainer, and the valve retainer is attached to the second retainer. An elastic body that is elastically deformable in the opening / closing direction of the valve body is interposed between the first holding body and the retaining member, and a first spherical surface portion is formed on the outer peripheral surface of the first holding body.
A valve characterized in that a second spherical surface portion is formed on the inner peripheral surface of the second holding body, the second spherical surface portion being slidably overlapped with the first spherical surface portion.