JP2001090857A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball valve that does not result in strength reduction of a valve body, and can have a ball inserted and placed inside a passage of the valve body. SOLUTION: A female screw 13 notched on its four places in the circumferential direction to be discontinuous is mounted as being protruded into inside on an inner circumferential face in an inner part of a valve body 1. A male screw 51 is mounted on an outer circumferential face of a ball presser 5. O ring 521 is mounted on an annular groove 52 formed on the outer circumferential face of the ball presser 5 position on the opposite side of a ball 2. Parts of the outer circumferential face of the ball 2 that do not abut on a ball sheet 4 are notched. An outer diameter D2 of the ball 2 with notched parts 22 and 23 is smaller than an inner diameter d2 of a thread portion of the female screw 13 of the valve body 1 in a condition that the ball 2 is directed to have a passage closed. A maximum outer diameter D1 of the ball 2 is smaller than an inner diameter d1 of the valve body 1 where the female screw 13 is not mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ball valve.

[0002]

2. Description of the Related Art As a conventional ball valve, a ball capable of opening and closing a flow path is disposed in a cylindrical valve body, and a ball sheet is brought into contact with the ball from both sides of the flow path. There is a so-called union type ball valve which is pressed toward a ball. In this ball valve, by connecting the connection sleeve to the valve body, the ball retainer is pressed by the connection sleeve and pressed toward the ball. For example, the ball presser is pressed by a connection sleeve connected to the valve body by the union nut, and the contact pressure between the ball and the ball seat is adjusted by adjusting the tightness of the union nut. When the fluid leaks due to wear, the union nut is tightened to prevent the leak.

The biggest disadvantage of this type of ball valve is that the union nut and the connecting sleeve on the opposite side are removed while the ball is closed and the fluid pressure is maintained on one side of the ball. That is not possible. In other words, when it is necessary to repair or replace the pipe connected to the connection sleeve, the union nut must be loosened and the connection sleeve must be removed. It jumped out of the body and was dangerous.

[0004] As a ball valve that has solved this disadvantage,
Japanese Patent Publication No. 1-55832 discloses that a pair of protrusions are provided on the inner peripheral portion of a valve body so that a fitting between a spindle and a ball can be performed by utilizing the fact that a portion of a passage hole of a ball is recessed from a spherical surface. There is disclosed an arrangement in which a ridge is provided and an engagement groove provided in the ball retainer is engaged with the ridge to prevent the ball retainer from jumping out.

As a ball valve which has solved the above-mentioned disadvantages, Japanese Patent Laid-Open Publication No. 57-37160 and Japanese Utility Model Laid-Open Publication No.
In Japanese Patent Publication No. 05474, a female screw is provided on the inner peripheral surface of the opening end of the valve body, while a male screw is provided on the outer peripheral surface of the ball retainer on the connection sleeve side, and the male screw of the ball retainer is screwed into the female screw of the valve main body. Discloses that the ball presser is prevented from jumping out.

[0006]

In the ball valve disclosed in Japanese Patent Publication No. 1-55832, the union nut is further tightened by providing some play in the engagement between the ridge and the engagement groove. Then, the ball presser can be slid toward the ball via the flange portion of the connection sleeve to increase the contact pressure between the ball and the ball seat, thereby ensuring water stoppage.

However, since the retightening of the union nut is an artificial operation, the union nut is loosened at the site, the connection sleeve is removed, and after repairing or replacing the pipe connected to the connection sleeve, the ball is tightened. When reassembling the valve, it has been difficult to adjust the contact pressure between the ball and the ball seat. When assembling, for example, if the union nut is excessively tightened, there is a problem that the contact pressure between the ball and the ball seat becomes too high, so that opening and closing of the ball becomes difficult.

On the other hand, in the ball valve disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 57-37160 and Japanese Utility Model Application Laid-Open No. Sho 57-105474, taking into consideration the insertability of the ball into the valve body,
Since the female screw is provided on the inner peripheral wall of the opening end of the valve body, the presence of the female screw has a problem that the strength of the valve body is substantially reduced.

An object of the present invention is to prevent the strength of the valve body from being reduced despite the presence of a thread on the inner peripheral surface of the valve body, and to insert and arrange a ball in the flow passage of the valve body. An object of the present invention is to provide a ball valve capable of preventing a ball and a ball presser from jumping out of a valve body.

[0010]

According to a first aspect of the present invention, there is provided a valve body having a ball capable of opening and closing a flow path, and a ball seat contacting the ball from both sides of the flow path. In a ball valve, at least one of the seats is adapted to be pressed toward a ball by a ball retainer screwed into a female screw provided on an inner peripheral surface of an inner peripheral surface of a valve body and a male screw provided on an outer peripheral surface thereof. The female screw of the valve body is provided on the inner peripheral surface on the back side where the ball retainer is inserted, so as to protrude inward from the inner peripheral surface,
The female screw is partially discontinuous in the axial direction of the flow path, and is formed as a discontinuous screw.On the other hand, the male screw of the ball retainer is provided on the outer peripheral surface on the back side where the female screw is inserted, and is smaller than this male screw. An annular groove is provided on the outer peripheral surface of the ball retainer located on the opening end side of the valve body, an O-ring is mounted in the annular groove, and a part of the outer peripheral surface of the ball that does not contact the ball seat is cut out. The outer diameter of the cut-out portion of the ball is set to be equal to or less than the inner diameter of the female thread portion of the valve body in a state where the ball is oriented in a direction in which the flow path is closed, and
The maximum outer diameter of the ball is equal to or less than the inner diameter of the valve body at the portion where the female screw is not provided.

According to a second aspect of the present invention, there is provided the ball valve according to the first aspect, wherein at least two recesses on the end face of the ball retainer located on the opposite side of the ball, where the tip of the rotating jig is locked. It is provided.

According to a third aspect of the present invention, in the ball valve according to the first aspect, an annular groove for mounting an O-ring is provided on an end face of the ball retainer located on the opposite side of the ball,
A recess is provided inside or outside of the annular groove to lock the tip of the rotating jig.

According to a fourth aspect of the present invention, in the ball valve according to the first aspect, female threads are provided on both inner peripheral surfaces of the valve body on the inflow side and the outflow side.

According to a fifth aspect of the present invention, in the ball valve according to the first aspect, a female screw is provided only on the inner peripheral surface of the valve body on the inflow side.

According to the present invention, a female screw is provided on the inner peripheral surface of the valve body so as to protrude from the inner peripheral surface. The ball is cut out in the axial direction to form a discontinuous screw, while a part of the outer peripheral surface of the ball that does not abut the ball sheet is cut out. In the direction in which is closed, since the inner diameter of the female thread portion of the valve body is equal to or less than the internal diameter of the valve body, and the maximum outer diameter of the ball is equal to or less than the inner diameter of the valve body of the portion where the internal thread is not provided. Despite the fact that the internal thread is provided to protrude inward from the inner peripheral surface of the valve body,
The ball can be inserted from the end of the valve body and placed in a state where the ball faces the direction in which the flow path is closed.

By screwing a male screw provided on the outer peripheral surface of the ball retainer on the ball side with a female screw of the valve body, the ball can be pressed by the ball retainer via the ball seat.

Further, since the female screw is provided so as to protrude from the inner peripheral surface of the valve body, the thickness of the wall of the valve body does not become thin, and the strength of the valve body does not decrease.

Further, since an O-ring is mounted in an annular groove provided on the outer peripheral surface of the ball retainer located closer to the opening end side of the valve body than the male screw, the outer peripheral surface of the ball retainer is connected to the valve by the O-ring. Water stoppage with the inner peripheral surface of the main body is maintained.

According to the second aspect of the present invention, the tip of the rotary jig is locked in two recesses provided on the end face of the ball retainer located on the opposite side of the ball to rotate the ball retainer. Thus, the screwing work between the valve body and the ball retainer can be easily performed.

According to the third aspect of the present invention, an annular groove for mounting an O-ring is provided on the end face of the ball retainer located on the opposite side of the ball, and the tip of the rotary jig is provided inside or outside the annular groove. Is provided, so that the water stopping performance on the end face side of the ball retainer is not affected at all.

According to the fourth aspect of the present invention, since the internal threads are provided on both inner peripheral surfaces of the valve body on the inflow side and the outflow side, the contact pressure between the ball and the ball seat can be easily adjusted. I can do it.

According to the fifth aspect of the present invention, since the female screw is provided only on the inner peripheral surface of the valve body on the inflow side, the valve assembling operation is simplified.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of a ball valve V of the present invention, FIG. 2 is a half sectional view showing a valve body in FIG. 1, and FIG. 3 is a right side view corresponding to FIG. The ball valve V is made of hard vinyl chloride resin.

In the figure, reference numeral 1 denotes a valve body, in which a ball 2 is inserted into the valve body 1, and a spindle 3 penetrating a wall surface of the valve body 1 is fitted into a concave groove 21 of the ball 2. A ball sheet 4 is applied to both sides of the ball 2, and a ball retainer 5 is inserted and held. The ball seat 4 is supported by being fitted into a ball retainer 5. A union nut 7 is screwed into a male screw 11 on the outer periphery of the end of the valve body 1, and the union nut 7 presses the connection sleeve 6 toward the ball retainer 5 to connect to the pipe. Reference numeral 8 denotes a handle, which is mounted on the upper end of the spindle 3.

In the present invention, the engagement and holding of the ball retainer 5 with the valve main body 1 is performed by using the female screw 12 provided on the inner peripheral surface of the valve main body 1 and the male screw 51 provided on the outer peripheral surface of the ball retainer 5. Is made by screwing.

Internal threads 12 are provided on the inner peripheral surfaces at the inner ends of both ends of the valve body 1 where the ball retainer 5 is inserted. The female screws 12, 12 are notched in four positions in the circumferential direction in the axial direction of the flow path to form discontinuous screws.
That is, as shown in FIG. 2 and FIG.
From the center axis of the through hole 10 into which the
Four screw portions located within a range of 3 degrees are cut out in the axial direction of the flow path to form cutout portions 13.

FIG. 4 shows the ball 2 (a).
Is a plan view, (b) is a front view, and (c) is a bottom view. FIG. 5 shows a cross section of the ball 2, and FIG.
4B is a cross-sectional view taken along the line AA, and FIG. 4B is a cross-sectional view taken along the line BB in FIG.

As shown in FIGS. 4 and 5, a part of the outer peripheral surface of the ball 2 which does not contact the ball sheet 4 is cut out, and the outer diameter D2 of the ball 2 in the cutouts 22 and 23 is equal to the ball 2 diameter. In the direction in which the flow path is closed (see FIG. 6), the inner diameter d2 of the female screw 12 of the valve body 1 is made slightly smaller than the inner diameter d2, and the ball 2
Is smaller than the inner diameter d1 of the valve body 1 in the portion where the female screw 12 is not provided.

As described above, the notch 2 on the outer peripheral surface of the ball 2
Since the cutouts 2 and 23 are located outside the maximum outer diameter portion of the ball seat 4, even if the cutouts 22 and 23 exist, the stop at the contact surface between the ball 2 and the ball seat 4 is stopped. There is no effect on aqueous.

As shown in FIG. 7, a male screw 51 and an annular groove 52 in which an O-ring 521 is mounted are provided on the outer peripheral surface of the ball retainer 5 from one end. In addition, an annular groove 53 in which an O-ring 531 is mounted is provided on an end face located on the opposite side of the male screw 51. Small dents 5 are formed at two opposite ends of the end face located outside the annular groove 53.
5, 55 are provided. When the male screw 51 of the ball retainer 5 is screwed into the female screw 12 of the valve body 1, the recess 54 locks the tip of a rotary jig (not shown) and turns the ball retainer 5.

The depressions 55 may be provided in at least two places. The depression 55 may be provided at a position where the sealing performance of the O-ring 531 is not impaired. Depending on the position of the annular groove 53, the depression 55 may be provided at an end face located inside the annular groove 53.

On the inner surface of the ball retainer 5 on the side of the male screw 51, an annular locking groove 54 for fitting and supporting the ball seat 4 is provided.

O-rings 5 are provided in these annular grooves 52 and 53.
21 and 531 are mounted to prevent leakage from between the ball presser 5 and the inner peripheral surface of the valve body 1 and the connection sleeve 6. The ball seat 4 is mounted in the locking groove 54 via an O-ring 541.

In order to assemble the ball valve V having the above structure, the spindle 3 is inserted into the valve body 1 through the through hole 10 and the lower end of the spindle 3 is projected into the valve body 1. It is inserted from the end of the valve body 1 in the direction in which the flow passage hole 20 is closed, and is fitted to the lower end of the spindle 3.

At this time, as shown in FIGS. 4 and 5, a part of the outer peripheral surface of the ball 2 which does not contact the ball sheet 4 is cut out, and the cutouts 22 and 23 are formed outside the ball 2. When the diameter D2 is set such that the ball 2 faces the direction in which the flow path is closed, the inner diameter d of the crest of the female screw 12 of the valve body 1 is set.
2 and the maximum outer diameter D1 of the ball 2 is smaller than the inner diameter d1 of the valve body 1 corresponding to the notch 13, so that the valve body 1
Despite the presence of internal thread 12 on the inner peripheral surface of
The ball 2 is inserted into the valve body 1 from the open end side of the valve body 1.
Can be inserted.

Next, the O-ring 541 and the ball seat 4 are placed inside the tip, and the ball holder 5 with the O-ring 521 mounted in the annular groove 52 is inserted into the valve body 1 with the side on which the ball seat 4 is mounted facing forward. Insert the ball holder 5 in the circumferential direction with a rotary jig,
The male screw 51 is screwed into the female screw 12 of the valve body 1 and screwed in. The contact pressure between the ball 2 and the ball seat 4 is reduced by the ball seat 4 mounted in the locking groove 54 of the ball retainer 5. A predetermined pressing force is set.

The annular groove 53 on the end face of the ball retainer 5
An O-ring 531 is attached to the connection sleeve 6, and the union nut 7 is screwed into a male screw 11 on the outer periphery of the end of the valve body 1, and the connection sleeve 6 is pressed toward the ball retainer 5, and The handle 8 is fitted to the upper end to complete the assembly of the valve V.

In the ball valve of the first embodiment, the outer diameter D2 of the ball 2 in the cutouts 22 and 23 is smaller than the inner diameter d2 of the ridge of the female screw 12 of the valve body 1, and the maximum diameter of the ball 2 Since the outer diameter D1 is smaller than the inner diameter d1 of the valve body 1 corresponding to the cutout portion 13, even if the female screw 12 is present on the inner peripheral surface of the valve body 1, the outer diameter D1 is set at the opening end side of the valve body 1. The ball 2 can be inserted into the valve body 1.

Since the female screw 12 is provided so as to protrude inward from the inner peripheral surface of the valve main body 1, the wall thickness of the valve main body 1 is not reduced, so that the strength of the valve main body 1 is reduced. Never.

Since the notches 22 and 23 provided on the outer peripheral surface of the ball 2 are located outside the maximum outer diameter of the ball seat 4, the existence of the notches 22 and 23 is as follows.
It has no effect on the water stoppage at the contact surface between the ball 2 and the ball seat 4.

FIG. 8 is a half sectional view showing a second embodiment of the ball valve of the present invention, FIG. 9 is a sectional view showing the valve body in FIG. 8, and FIG. 10 is a right side showing an assembled state of the ball valve V in FIG. FIG. 11 is a half sectional view showing the ball valve corresponding to FIG. 8 with the flow path closed.

In the ball valve V1 of the second embodiment, one end of the valve body in the ball valve V of the first embodiment is integrated with a portion corresponding to the ball retainer 5 as shown in FIG. Basically, except for the first
Since they are the same as the ball valve of the embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

That is, in the case of the second embodiment, as shown in FIG. 9, when a pipe is connected to a pipe, the female screw 12 is provided only on the inner peripheral surface of the valve body 1A on the inflow side. . Then, an O-ring 541 and a ball seat 4 are mounted in a locking groove 54A provided on the inner peripheral surface of the left end portion of the valve body 1A in FIG. 9, and the ball 2 is inserted into the valve body 1A from the right opening end side. Inserted, valve body 1
The ball holder 5 having the ball seat 4 inserted into the locking groove 54 is inserted and held on the right side of the ball 2. The male screw 11 on the outer periphery of the end of the valve body 1
The union nut 7 is screwed into the
The connection sleeve 6 is pressed toward the ball retainer 5 to be connected to the pipe.

Also in the case of the second embodiment, the notches 22 and 2
The outside diameter D2 of the ball 2 is the internal thread 12 of the valve body 1A.
And the maximum outer diameter D1 of the ball 2 is smaller than the inner diameter d1 of the valve body 1A corresponding to the notch 13, so that the valve body 1A
Even if the internal thread 12 is present on the inner peripheral surface of the valve body 1A, as shown in FIG.
The ball 2 can be inserted therein.

Since the valve body 1A is of a single carrier type, the assembling work of the ball valve is simplified.

In the above embodiment, the ball valve is made of resin, but may be made of metal.

[0047]

According to the ball valve of the present invention, a female screw is provided on the inner peripheral surface of the valve body so as to protrude from the inner peripheral surface, and a part of the female screw in the circumferential direction is provided. It is cut off in the axial direction of the flow path and becomes a discontinuous screw,
On the other hand, in a state in which a part of the outer peripheral surface of the ball that does not contact the ball seat is cut out, and the outer diameter of the cut-out portion of the ball faces the direction in which the flow path is closed, the valve body is closed. The inner diameter of the female thread of
Since the maximum outer diameter of the ball is equal to or smaller than the inner diameter of the valve body in a portion where the female screw is not provided, the ball is provided even though the female screw is provided to protrude inward from the inner peripheral surface of the valve body. Can be inserted from the end of the valve body and placed in a state where the flow path is turned in the direction in which the flow path is closed.

By screwing a male screw provided on the outer peripheral surface of the ball retainer on the ball side with a female screw of the valve body, the ball can be pressed by the ball retainer via the ball seat.

Further, since the female screw is provided so as to protrude from the inner peripheral surface of the valve body, the thickness of the wall of the valve body does not become thin, and the strength of the valve body does not decrease.

Further, since an O-ring is mounted in an annular groove provided on the outer peripheral surface of the ball retainer located on the outer peripheral surface of the ball retainer located closer to the opening end side of the valve body than the male screw, the O-ring is used. The water stoppage between the outer peripheral surface of the ball retainer and the inner peripheral surface of the valve body is maintained.

According to the second aspect of the present invention, the tip of the rotary jig is locked in a recess provided on the end face of the ball retainer located on the opposite side of the ball, and the ball retainer is rotated. Screwing work between the main body and the ball holder can be easily performed.

According to the third aspect of the present invention, an annular groove for mounting an O-ring is provided on the end face of the ball retainer located on the opposite side of the ball, and the tip of the rotary jig is located inside or outside the annular groove. Is provided, so that the water stopping performance on the end face side of the ball retainer is not affected at all.

According to the fourth aspect of the present invention, since the female threads are provided on both inner peripheral surfaces of the valve body on the inflow side and the outflow side, the contact pressure between the ball and the ball seat can be easily adjusted. I can do it.

According to the fifth aspect of the present invention, since the female screw is provided only on the inner peripheral surface of the valve body on the inflow side, the valve assembling operation is simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a ball valve of the present invention.

FIG. 2 is a half sectional view showing a valve main body in FIG. 1;

3 is a right side half sectional view corresponding to FIG. 2;

FIG. 4 is a plan view, a front view, and a bottom view showing the ball in FIG. 1;

5 is a sectional view taken along line AA of FIG. 4 (b) and a sectional view taken along line BB of FIG. 4 (a).

FIG. 6 is an explanatory view showing a state in which a ball is inserted into a valve body.

FIG. 7 is a sectional view showing the ball presser shown in FIG. 1;

FIG. 8 is a half sectional view showing a second embodiment of the ball valve of the present invention.

FIG. 9 is a sectional view showing the valve body in FIG. 8;

FIG. 10 is an explanatory view showing a state in which a ball is inserted into a valve body.

FIG. 11 is a half sectional view showing the ball valve corresponding to FIG. 8 with the flow path closed.

[Explanation of symbols]

 V ball valve 1 valve body d1 inner diameter of valve body 10 through hole 11 male screw 12 female screw d2 female screw crest inner diameter 13 notch 2 ball 20 flow path hole 21 concave groove 22, 23 notch D1 maximum outer diameter of ball D2 ball Outer diameter 3 Spindle 4 Ball seat 5 Ball retainer 51 Male screw 52, 53 Annular groove 521, 531, 541 O-ring 54 Locking groove 55 Depression 6 Connection sleeve 7 Union nut 8 Handle

Claims (5)

[Claims] A ball which can open and close a flow path is disposed in a valve body, and a ball sheet is brought into contact with the ball from both sides of the flow path, and at least one of the ball sheets is attached to an inner peripheral surface of the valve body. In a ball valve in which a female screw provided on an outer peripheral surface thereof is pressed toward a ball by a ball retainer screwed into the external thread, a ball retainer is inserted into the female screw of the valve body. On the inner peripheral surface on the back side, provided so as to protrude inward from the inner peripheral surface, a part of the female screw in the circumferential direction is cut out in the axial direction of the flow path to be a discontinuous screw. The male screw of the ball retainer is provided on the outer peripheral surface on the back side into which the ball screw is inserted, and an annular groove is provided on the outer peripheral surface of the ball retainer located closer to the opening end side of the valve body than the male screw. Attached A part of the outer peripheral surface of the ball that does not contact the ball seat is cut out, and the outer diameter of the cut-out portion of the ball faces the direction in which the flow path is closed. A ball valve wherein the inner diameter of the ball is less than or equal to the inner diameter of the female screw thread portion, and the maximum outer diameter of the ball is equal to or less than the inner diameter of the valve body where no female screw is provided. 2. The ball valve according to claim 1, wherein at least two places on the end face of the ball press located on the opposite side of the ball are provided with depressions for engaging the tip of the rotating jig. 3. An annular groove for mounting an O-ring is provided on an end face of a ball retainer located on the opposite side of the ball, and a recess in which the tip of a rotating jig is locked inside or outside the annular groove. The ball valve according to claim 2, further comprising: 4. The ball valve according to claim 1, wherein internal threads are provided on both inner peripheral surfaces of the valve body on the inflow side and the outflow side. 5. The ball valve according to claim 1, wherein a female screw is provided only on an inner peripheral surface of the valve body on the inflow side.