JPH08334185A - Ball valve - Google Patents

Abstract

PURPOSE: To simplify a structure, prevent missing at the time of assembly, and prevent a ball retainer and a ball from jumping out by inner pressure with disengagement of a valve main body and the ball retainer with the ball retainer reversed at the time of disassembling. CONSTITUTION: A pair of projections 12, 12 which are faced to each other along a circumferential direction are arranged on the inner circumferential surface of a valve main body 1, a large diameter part 52 and a small diameter part are alternately arranged in the circumferential direction on a ball retainer 5, an engaging groove 55 whose small diameter extends in the circumferential direction is arranged on the outer side of the large diameter part 52, the engaging groove 55 of the ball retainer 5 is engaged with the projections 12, 12 of the valve main body 1, a flange 50 is arranged on the outer side end of the ball retainer 5, and a rubber ring 8 is held between the end surface of the valve main body 1 and the flange 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve, and more particularly to a block type ball valve in which balls do not come out of a valve body.

[0002]

2. Description of the Related Art As a conventional ball valve, a ball that can open and close a flow path is arranged in a cylindrical valve body, and a ball seat is abutted from both sides of the flow path to the ball seat. There is known a so-called union type ball valve that is pressed toward the ball by the. In this ball valve, the connecting sleeve is connected to the valve body so that the ball retainer is pressed by the connecting sleeve and pressed toward the ball. For example, the ball retainer is pressed by the connecting sleeve that is connected to the valve body by the union nut,
By adjusting the tightness of the union nut, the contact pressure between the ball and the ball seat is adjusted.
When the ball seat wears and fluid leakage occurs, the union nut is retightened to prevent leakage.

The greatest drawback of this type of ball valve is that it is difficult to remove the union nut and connecting sleeve on the opposite side while the ball closes the flow path and fluid pressure is maintained on one side of the ball. is there. That is, when repairing or replacing the pipe connected to the connecting sleeve,
It is necessary to loosen the union nut to remove the connecting sleeve. However, if the connecting sleeve is removed, the ball and the ball retainer may pop out of the valve body due to fluid pressure.

Therefore, as a solution to this drawback,
In Japanese Patent Publication No. 53-6375, a ball retainer provided with a dog around it is pushed into the valve body and rotated to engage the dog with a groove provided on the inner peripheral surface of the valve body. The thing which prevented popping out is disclosed.

In this ball valve, when the connecting sleeve is removed and disassembled for the purpose of repairing or replacing the pipe, cleaning the ball valve, or replacing parts, the ball retainer moves in the opposite direction by loosening the union nut. Rotate the ball retainer in the direction in which the dog engages with the groove to prevent the dog from coming out of the groove in the direction opposite to the direction in which the dog is engaged and the ball and ball retainer from jumping out of the valve body. At this time, the structure is such that a pawl for preventing the reverse rotation of the ball retainer is inserted into a gap formed in the circumferential direction between the inner surface of the valve body and the ball retainer.

[0006]

However, in the ball valve disclosed in the above Japanese Patent Publication No. 53-6375,
You may forget to insert the pawl when assembling the valve. Especially when assembling after disassembling the ball valve installed at the piping site, the worker forgets to insert the pawl without being familiar with the structure of the ball valve, and as a result, the ball retainer reverses and the dog and groove are disengaged. There is. Also,
Since the structure is complicated and the claws are small, the assembly work is complicated and the claws are easily lost.

The present invention has been made in view of the problems of the prior art as described above, and has a simple structure and is easy to assemble and disassemble, and does not cause an assembly error. An object of the present invention is to provide a block type ball valve in which the ball retainer rotates in the same direction and rotates in the reverse direction, the ball retainer and the valve body are disengaged from each other, and the ball retainer and the ball do not fly out due to fluid pressure.

[0008]

In order to achieve the above object, a ball valve according to the present invention has a ball which is capable of opening and closing a flow passage in a valve body, and the ball has a ball seat from both sides of the flow passage. In a ball valve in which the ball seat is abutted and the ball seat is pressed toward the ball by the ball retainer, a pair of circumferential ridges at least facing the inner peripheral surface of the valve body into which the ball retainer is inserted. The ball retainer is provided with a large-diameter portion to be inserted into the inner surface of the valve body and a small-diameter portion to be inserted along the protruding portion alternately provided in the circumferential direction, and to the outer side of the large-diameter portion. The small-diameter portion is provided with an engagement groove extending in the circumferential direction so that the engagement groove of the ball retainer and the protrusion of the valve body are engaged with each other. Of the valve body Ring having elasticity between the surface and the flange (hereinafter referred to as elastic ring) is intended to subject matter that is sandwiched.

[0009]

In the ball valve of the present invention, the ball retainer is blocked by the valve body by engaging the protrusion provided on the inner peripheral surface of the valve body with the engaging groove provided on the outer peripheral surface of the ball retainer. . The elastic ring is fitted on the outside of the ball retainer and is sandwiched between the end surface of the valve body and the flange of the outer end of the ball retainer, so the structure is simple and the assembly work is easy. There is no. As the ball retainer is pressed toward the ball, the elastic ring is compressed between the end surface of the valve body and the collar,
Even if the union nut is rotated in the loosening direction, a large friction force acts between the end surface of the valve body and the elastic ring, and the ball retainer does not rotate together. Therefore, the protrusion of the valve body and the engagement groove of the ball retainer are prevented from being disengaged. Further, since the elastic ring is compressed and deformed by elasticity, even if the ball seat is worn and leakage occurs, the leakage can be eliminated by further tightening.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of the present invention, and FIG.
3 is a cross-sectional view taken along line X-X of FIG. 3, FIG. 3A is a side view showing an example of the valve body, FIG. 3B is a cross-sectional view taken along line Y-Y of FIG. 4A, and FIG. FIG. 5A is a side view showing an example of a state of being assembled, FIG. 5A is a side view showing an example of a ball retainer, FIG. 5B is a front view, and FIG. 6A is a side view showing an example of an elastic ring. Is a cross-sectional view, FIG.
FIG. 3 is a side view showing a state in which a connecting sleeve and a union nut on one side are removed in an example of the present invention. The state in which the ridge of the turned position main body and the engaging groove of the ball retainer are engaged and blocked is shown.

The ball 2 is inserted into the valve body 1, and the spindle 3 penetrating the wall surface of the valve body 1 fits into the concave groove 21 of the ball 2. Ball seats 4 are applied to both sides of the ball 2, and a ball retainer 5 is inserted and held. The ball seat 4 is fitted into and supported by the ball retainer 5. Male screw 11 on the outer periphery of the end of the valve body 1
A union nut 7 is screwed into the shaft, and when the union nut 7 is tightened, the connecting sleeve 6 is pressed toward the ball retainer 5, the ball seat 4 is pressed against the ball 2, and the ball 2 is in the fully closed position. The sealing property between the ball 2 and the ball seat 4 when hit is maintained. A pipe (not shown) is connected to the connection sleeve 6.

A flange 50 is provided at the outer end of the ball retainer 5, and a rubber ring 8 is provided between the end surface of the valve body 1 and the flange 50.
(Elastic ring) is clamped. When the union nut 7 is tightened, the rubber ring 8 is compressed and elastically deformed. Therefore, when the ball seat 4 wears and leaks occur, the union nut 7 is further tightened to increase the pressure contact pressure between the ball 2 and the ball seat 4 so that the leak can be eliminated.

To hold the ball retainer 5 in engagement with the valve body 1, the projections 12, 12 provided on the inner peripheral surface of the valve body 1 are held.
And the engaging groove 55 provided on the outer peripheral surface of the ball retainer 5. The details will be described below. The protrusion 1 is formed on the inner peripheral surface of the valve body 1 into which the ball retainer 5 is inserted.
2, 12 are provided. When the balls 2 are inserted into the valve body 1 in the direction in which the flow passage is closed, the protrusions 12, 12 are provided along the circumferential direction at positions facing the flow passage holes 22 of the ball 2. . That is, since the flow path hole 22 is provided in the ball 2, the flow path hole 22 and the surrounding portion are recessed from the spherical surface of the ball 2, and the recessed part does not hinder the insertion of the ball 2. The ridges 12, 12 are provided within the range. The height of the ridges 12 and 12 is limited to the range of the recessed portion of the ball 2, but the width thereof is determined so that the pressure acting on the ball 2 can be safely received through the ball retainer 5. .

A step portion 51 for fitting and supporting the ball seat 4 is provided on the inner surface of the ball retainer 5, and a large diameter portion 52 and a ridge 1 which are inserted along the inner peripheral surface of the valve body 1 are provided on the outer periphery.
Small-diameter portions 53 inserted along Nos. 2 and 12 are alternately provided at two places. The large diameter portion 52 forms the outer peripheral cylindrical surface of the ball retainer 5, while the small diameter portion 53 forms the ridges 12, 12
The stepped portion 54 formed outside the large diameter portion 52, which is slightly longer than the length inserted into the outer peripheral surface, connects to the outer peripheral cylindrical surface having the same diameter as the large diameter portion 52. Such a small diameter portion 53
With the provision of, the ball retainer 5 can be inserted into the valve body 1 and the ball seat 4 can be pressed toward the ball 2 even if the ridges 12, 12 are provided.

Further, the large diameter portions 52, 52 located between the small diameter portions 53, 53 of the ball retainer 5 are provided with engaging grooves 55 in the circumferential direction along the step portion 54. The width of the engaging groove 55 has the step portion 54 as one side surface, and the ridge 12 is formed from this side surface.
The width of the ball retainer 5 is slightly wider than the width of the ball retainer 5 so that the ball retainer 5 can be further pressed and adjusted toward the ball 2 when the engaging groove 55 and the protrusion 12 are engaged with each other. This engagement groove 5
5, a large-diameter portion 52 is left in the circumferential direction on the side opposite to the step portion 54 to form a locking ridge 56, and the locking ridge 56 engages with the ridge 12 so that the ball retainer 5 is secured. It is prevented from jumping out of the valve body 1. The locking projection 56 has a large diameter portion 52.
May be provided over the entire width in the circumferential direction, but by leaving one end in the circumferential direction as a large diameter portion, this portion becomes the stopper 57, and the ball retainer 5 is inserted into the valve body 1 to When the ridge 12 is engaged with the engagement groove 55 by turning in the direction, the engagement between the both can be surely performed.

Further, the ball retainer 5 is provided with an annular groove 58 on the outer periphery on the side corresponding to the end of the valve body 1 and an annular groove 59 on the outer end surface. The annular grooves 58, 59 have O-rings 91, 92 respectively. Is fitted to prevent leakage between the ball retainer 5 and the inner peripheral surface of the valve body 1 and the connection sleeve 6.

Further, a flange 50 is provided on the outer end of the ball retainer 5, and a rubber ring 8 is sandwiched between the end surface of the valve body 1 and the flange 50. The rubber ring 8 is elastically compressed between the end face of the valve body 1 and the collar 50 in a state where the ball valve is assembled and the sealing property between the ball 2 and the ball seat 4 is completely maintained. When the union nut 7 is further tightened, the union nut 7 is further elastically compressed, and the pressure contact pressure between the ball 2 and the ball seat 4 can be increased.

Further, at the end of the valve body 1, a position mark for inserting the ball retainer 5 into the valve body 1 and a position mark for finishing the rotation of the ball retainer 5, and the collar 50 for matching the above-mentioned two position marks. It is preferable to attach an arrow indicating the direction in which the alignment mark M and the ball retainer 5 are rotated (see FIG. 7).

To assemble the ball valve having the above structure,
The spindle 3 is fitted into the valve body 1 and the lower end of the spindle 3 is projected inwardly of the valve body 1, while the ball 2 is directed toward the direction in which the flow path hole 22 is closed.
Is inserted from the end of the spin reel 3 and fitted with the lower end of the spin reel 3. Next, the step portion 51 is provided with the ball seat 4, the large diameter portion 52 adjacent to the collar 50 is provided with the rubber ring 8, and the outer peripheral groove 58 is provided with the O ring 9.
Insert the ball retainer 5 in which 1 is fitted so that the small diameter portion 53 is aligned with the position of the projection 12 of the valve body 1, and when the ball seat 4 contacts the ball 2, rotate the ball retainer 5 in the circumferential direction to project it. The engaging groove 55 of the ball retainer 5 is engaged with the strip 12. At this time, the position mark to be inserted and the alignment mark M
Insert the ball retainer 5 by aligning with and (see FIG. 7 (A)), and then confirm the direction of turning with the arrow, and confirm that it has been completely turned by checking that the position mark and the alignment mark M match. (See FIG. 7B). Further, the O-ring 92 is fitted into the groove 59 on the end face of the ball retainer 5 and the connecting sleeve 6 is applied, and the union nut 7 is screwed onto the male screw 11 on the outer periphery of the end of the valve body 1 to connect the connecting sleeve 6.
Is pressed toward the ball retainer 5, and a handle (not shown) is fitted into the spindle 3 to complete the assembly.

The ball valve assembled in this manner has the protrusions 12, 12 provided on the inner peripheral surface of the valve body 1.
And the engaging groove 55 provided on the outer peripheral surface of the ball retainer 5 are engaged with each other, and even if one of the union nuts 7 is removed, the ball 2 and the ball retainer 5 are moved by the fluid pressure due to the fluid pressure.
Never jump out.

Further, since the rubber ring 8 is sandwiched between the end face of the valve body 1 and the collar 50, even if the union nut 7 is rotated in the loosening direction, the gap between the end face of the valve body 1 and the rubber ring 8 is increased. A frictional force acts on the ball retainer 5 and the ball retainer 5 does not rotate together with the union nut 7. Therefore, the protrusions 12 and 12 of the valve body 1 and the engagement groove 55 of the ball retainer 5 are prevented from being disengaged. Since the rubber ring 8 and the collar 50 have a larger diameter than the O-ring 92, the O-ring 92 is compressed between the connecting sleeve 6 and the ball retainer 5 when the union nut 7 is loosened, and tries to rotate together with the frictional force. On the other hand, the friction resistance moment due to the rubber ring 8 becomes larger, which is advantageous in preventing co-rotation.

FIG. 8 shows another example of the rubber ring. Since this rubber ring 81 has a serrated surface on the side in contact with the end face of the valve body, it has a larger coefficient of friction with the end face of the valve body, and has the effect of preventing co-rotation of the ball retainer when loosening the union nut. Even bigger. Further, since it is more likely to be compressed and deformed as compared with a flat rubber ring, a large tightening allowance can be taken when the ball seat is worn and the sealing performance is deteriorated.

Incidentally, in order to increase the frictional resistance between the end face of the valve body and the rubber ring, the end face of the valve body may be provided with an uneven pattern.

When the ball retainer is installed in the valve body or removed from the valve body, the ball retainer is rotated while the rubber ring is compressed. Therefore, there is a space between the rubber ring and the collar provided at the outer end of the ball retainer. Rather, it is preferable that the rubber ring is slippery. Therefore, the surface of the rubber ring that is in contact with the flange may be formed of or covered with a material having a low friction coefficient such as tetrafluoroethylene or nylon.

The present invention can be applied to any block type ball valve in which the ball retainer is inserted into the valve body and rotated to prevent the ball retainer and the ball from jumping out. For example, Jitsuko Sho 5 cited as prior art
Even in the bayonet type ball valve described in No. 3-6375, a flange similar to that of the above-described embodiment is provided at the outer end of the ball retainer, and an elastic ring is sandwiched between it and the end face of the valve body. As a result, even if the ball retainer tries to reverse, a large frictional force acts between the end surface of the valve body and the elastic ring to prevent reverse rotation. Therefore, the ball retainer does not reverse even if the reverse rotation preventing pawl is forgotten, and the reverse rotation preventing pawl becomes unnecessary.

The ball valve of the present invention is constructed as described above, and the protrusion provided on the inner peripheral surface of the valve body and the engaging groove provided on the ball retainer are engaged with each other. It has a block function that prevents the ball and ball retainer from popping out due to fluid pressure even if the union nut and connecting sleeve on one side are removed. The compression of the elastic ring sandwiched between the end surface of the valve body and the collar provided at the outer end of the ball retainer causes the friction between the end surface of the valve body and the elastic ring even if the union nut is turned in the loosening direction. Due to the resistance, the ball retainer does not rotate together, and the protrusion of the valve body and the engagement groove of the ball retainer are not disengaged. Therefore, the ball retainer and the ball are prevented from jumping out of the valve body due to the residual internal pressure. Further, the structure is simple, the assembling and disassembling is easy, and the assembling mistake and the parts are not lost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

3A and 3B are explanatory views showing an example of a valve body, FIG. 3A is a side view, and FIG. 3B is a cross-sectional view taken along line YY of FIG.

FIG. 4 is a side view showing a state where a ball and a spindle are incorporated in the valve body.

FIG. 5 is an explanatory view showing an example of a ball retainer, (A) is a side view, and (B) is a front view.

6A and 6B are explanatory views showing an example of an elastic ring, in which FIG. 6A is a side view and FIG. 6B is a sectional view.

FIG. 7 is a side view showing a connection sleeve on one side and a union nut removed in an example of the present invention. (A) shows a state in which the ball retainer is inserted into the valve body, and (B) shows a state in which the ball retainer is blocked. Status.

FIG. 8 is an explanatory view showing another example of the elastic ring, (A)
Is a side view of the side in contact with the end face of the valve body, and (B) is a partially enlarged cross-sectional view taken along line ZZ of (A).

[Explanation of symbols]

 1 Valve body 11 Male screw 12 Projection 2 Ball 4 Ball seat 5 Ball retainer 50 Collar 52 Large diameter part 53 Small diameter part 55 Engagement groove 56 Engaging projection 6 Connection sleeve 7 Union nut 8,81 Rubber ring (ring with elasticity )

Claims (1)

[Claims] 1. A ball capable of opening and closing a flow passage is arranged in a valve body, a ball seat is abutted from both sides of the flow passage, and the ball seat is pressed against the ball by a ball retainer. In the ball valve, the inner peripheral surface of the valve body into which the ball retainer is inserted is provided with at least a pair of ridges extending in the circumferential direction, and the ball retainer has a large diameter portion to be inserted into the inner surface of the valve body. Small diameter portions to be inserted along the protruding portions are alternately provided in the circumferential direction, and engagement grooves formed by extending the small diameter portions in the circumferential direction are provided on the outer side of the large diameter portion, and The engagement groove and the protrusion of the valve body are engaged with each other, and a flange is provided on the outer end of the ball retainer, and an elastic ring is sandwiched between the end surface of the valve body and the flange. Is characterized by being Levalve.