JP3147934B2 - Ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 rotatably arranged in a valve box, and a ball sheet is brought into contact with the ball from both sides of the flow path. There is a type in which a presser is pressed toward a ball.

In this ball valve, by connecting a connection sleeve to a valve box, a ball presser is pressed by the connection sleeve and pressed toward the ball. For example, a ball presser is pressed by a connection sleeve connected to a valve box by a union nut, and by adjusting the tightening of the union nut, the contact pressure between the ball and the ball seat is adjusted. It is a compensation mechanism for fluid leakage due to wear. The biggest disadvantage of this type of ball valve is that the union nut and the connection sleeve cannot be removed with the ball closed and the residual pressure of the fluid upstream of the ball. is there. That is, 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.However, when the connection sleeve is removed, the ball and the ball presser are pressed by the fluid pressure. There is a risk that running water will flow out of the valve box.

Therefore, conventionally, even when the connection sleeve is removed while the ball is closed when replacing the pipe, the ball and the ball retainer do not jump out of the valve box due to the residual pressure of the fluid from the upstream side, thereby preventing the discharge of flowing water. Oite as a ball valve which can be, for example, in Japanese Unexamined Utility Model Publication No. 58-89656, the valve
Female threads are provided on the inner peripheral surface of both open ends of the box,
Provide an external thread on the outer surface of the presser
A threaded engagement with the female screw of the box is disclosed.

[0005]

However, the prior art has the following problems. Ball into valve box
In consideration of the ease of insertion, insert the female screw into the inner peripheral wall of the open end of the valve box.
The internal thread is located at
The thickness of the inner peripheral wall at the opening end of the valve box is substantially
As a result, the strength of the valve box is substantially reduced.

[0006] The external thread of the ball retainer is formed in the anti-ball position side than the mounting portion of the seal member to reduce the liquid-tight between provided on the outer periphery by the valve body interior surface of the ball retainer
In, screwing state is broken between the ball retainer and the valve box, the ball retainer is moved offset in a counter-ball position direction, the ball retainer
A seal member attached to the outer periphery of the valve box is provided on the inner surface of the valve box
There is a possibility that the internal thread may be damaged by interfering with the internal thread , resulting in poor sealing.

An object of the present invention is to provide a female screw on an inner peripheral surface of a valve box.
Despite its existence, the strength of the valve box did not decrease,
The ball can be inserted and placed in the flow path of the valve box,
To prevent the ball and ball presser from
It is to provide a ball valve that can be used.

[0008]

According to the first aspect of the present invention, a ball capable of opening and closing a flow path is rotatably arranged in a valve box, and ball sheets come into contact with the ball from both sides of the flow path. The ball seat is pressed against the ball by a ball retainer.
The inner peripheral surface of the part where the ball retainer of the valve box is inserted
With the ball facing the direction in which the flow path closes.
When assembling the
A notched female screw is provided along the direction of
Male thread is provided on the outer peripheral surface located on the
The ball located closer to the open end of the valve box than this male screw
An annular groove is provided on the outer peripheral surface of the presser.
Is mounted, and the male screw of the ball retainer is
The screw is screwed .

[0009]

According to the present invention, the following effects are obtained.
You. Utilizing the fact that the hole of the ball is recessed from the spherical surface
So that the spindle and ball can be engaged and assembled.
The ball is directed to the inner peripheral surface of the valve box so that the flow path closes.
When inserting the ball into the valve box in the state,
A protruding notched female screw along the circumferential direction is
The male screw provided on the outer peripheral surface of the ball retainer
The wall of the valve box is thin
And the strength of the valve box does not decrease,
Also, it is possible to prevent the ball presser from jumping out.

[0010] The notched female screw is located inside the inner peripheral surface of the valve box.
Despite being protruded toward
Open the valve box with the flow path closed.
Can be inserted from the part to incorporate the ball,
The size of the valve box can be reduced.

Further, an annular groove in which an O-ring is mounted.
Is a ball retainer located closer to the open end of the valve box than the male screw.
Is provided on the outer peripheral surface of the
The O-ring remains on the inner surface of the valve box even if it moves
It does not interfere with the notched female screw existing in this
Therefore, the O-ring is not damaged and the inner circumference of the valve box is
The sealing performance between the surface and the outer peripheral surface of the ball retainer is not impaired at all.
Good.

[0012]

1 is a sectional view showing a ball valve to which an embodiment of the present invention is applied, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. FIG. 5 and FIG. 5 are schematic diagrams showing a ball presser.

As shown in FIGS. 1 to 3, the ball valve 10 comprises:
A ball 14 that can open and close the flow paths 12 and 13 is rotatably disposed in the valve box 11.
The ball seats 15 and 16 abut from the third side, and the ball seats 15 and 16 are pressed toward the ball 14 by the ball pressers 17 and 18. 19 is formed.
Reference numeral 20 denotes a through hole provided in the ball 14.

A spindle 2 is provided at the center of the valve box 11.
The spindle 1 is rotatably supported, the inner end of the spindle 21 is engaged with the concave groove 22 of the ball 14, and the handle 23 is fixed to the outer end of the spindle 21.

Further, union nuts 24 and 25 are screwed to the outer diameter portions at both ends of the valve box 11.
Reference numeral 25 designates connection sleeves 26 and 27 for connecting the pipes to the outer end surfaces of the ball pressers 17 and 18.

Reference numerals 28 and 29 denote the valve box 11 and the ball retainer 1.
O-rings provided between the valve holders 7 and 18; 31 is an O-ring provided between the valve box 11 and the spindle 21; 32 and 33 are provided between the ball holder 17 and the connection sleeve 26; This is an O-ring provided in the.

Then, as shown in FIG.
Male screws 42 are provided on the outer peripheral surfaces of the ball retainers 17 and 18
Provided on the opening end side of the valve box 11 with respect to the male screw 42.
An annular O-ring mounting groove 41 is provided on the outer peripheral surface
ing. O-rings 28 and 29 are mounted in this mounting groove 41
Have been. Also, the ball holders 17 and 18 of the valve box 11
As shown in FIG. 3 and FIG.
A notched female screw 43 is provided. This notched female screw
43 is a valve box with the ball 14 facing the direction in which the flow path is closed.
When inserted into the hole 11, it faces the through hole 20 of the ball 14.
In the circumferential direction. That is,
Since the ball 14 is provided with the through hole 20,
The hole 20 and the part around it are higher than the spherical surface of the ball 14
This concave part (arc-shaped void phase
Within the range (W) that does not hinder the insertion of the ball 14
And a notched female screw 43 is provided. Notched female screw 43
The height of the thread is limited to within the recess.
Then, the ball presser 1 inserted into the inner peripheral portion of the valve box 11
7 and 18 are screwed into the notched female screw 43 of the valve box 11.
By being combined, it is connected to the valve box 11.

Next, the operation of the present embodiment will be described.
The screw portion into which the ball retainers 17 and 18 are screwed is attached to the valve case 11
Of the inner surface of the valve box 11 is formed as a notched female screw 43, so that the thickness of the valve box 11 can be prevented from becoming thin and fragile, and the ball holding down can be performed without lowering the strength of the valve box 11. 17 and 18 to valve box 1
1 can be reliably prevented from falling off.

The notched female screw 43 formed in the valve case 11 is formed on the inner surface of the valve case 11 in the direction of ball rotation in the same level range as the opening of the through hole 20 provided in the ball 14. When the ball 14 is assembled into the valve box 11, the notched female screw 43 is formed in a portion corresponding to an arc-shaped gap formed between the opening of the through hole 20 of the ball 14 and the inner surface of the valve box 11. Therefore, the ball 14 can be incorporated while the inner diameter of the valve box 11 is substantially the same as the ball diameter, and the dimensions of the valve box 11 can be reduced in size.

Males formed on ball retainers 17 and 18
A spike 42 is formed on the outer periphery of the ball retainers 17, 18 and is formed on the position closer to the ball 14 than the O-ring insertion grooves 41 of the O-rings 28, 29 for liquid tightness between the inner surfaces of the valve box 11. Accordingly, screwing state is broken between the ball retainer 17, 18 and valve body 11, moving the ball retainer 17, 18 is displaced in the counter-ball position direction, O-ring 28, 29 the valve box 11
The O-rings 28 and 29 can be prevented from being damaged without interfering with the notched female screw 43 on the inner surface, and the occurrence of poor sealing can be prevented.

[0021]

According to the first aspect of the present invention,
The spin of the through hole of the
The ball of the valve box should be mounted so that the dollar and ball can be engaged.
A ball flows through the inner peripheral surface of the part where the
Assemble ball into valve box with closing direction
At the position facing the through hole of the ball
-Shaped notched female screw, and the notched female screw
The external thread provided on the outer peripheral surface was screwed into the valve.
The thickness of the wall of the box does not become thin, the strength of the valve box does not decrease,
Prevents balls and ball retainers from jumping out of the valve box
Wear. Then, the notched female screw is positioned more inward than the inner peripheral surface of the valve box.
Despite being protruded, the ball flows through the channel
To the direction in which
The ball can be inserted by inserting the ball. Ma
Also, the annular groove on which the O-ring is mounted is
Provided on the outer peripheral surface of the ball presser located on the open end side of the valve box
The ball holder is in the opposite direction to the ball (valve
O-ring inside the valve box
O-ring is damaged without interference with notched internal thread
The inner peripheral surface of the valve box and the outer peripheral surface of the ball retainer.
The property is not impaired at all.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a ball valve to which an embodiment of the present invention is applied.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a schematic view showing a valve box.

FIG. 5 is a schematic view showing a ball presser.

[Explanation of symbols]

Reference Signs List 10 Ball valve 11 Valve box 12, 13 Flow path 14 Ball 15, 16 Ball seat 17, 18 Ball retainer 41 O-ring mounting groove 42 Male screw 43 Notched female screw

Claims (1)

(57) [Claims] A ball capable of opening and closing a flow path is rotatably arranged in a valve box, and a ball sheet is abutted against the ball from both sides of the flow path, and the ball sheet is directed toward the ball by a ball presser. In the ball valve adapted to be pressed, an inner peripheral surface of a portion of the valve box into which the ball retainer is inserted,
Place the ball in the valve box with the ball
When installing the ball, at the position facing the through hole of the ball,
A protruding notched female screw is provided along the circumferential direction,
If an external thread is provided on the outer peripheral surface located on the ball side of
In addition, the bolt located closer to the open end of the valve box than this male screw
An annular groove is provided on the outer peripheral surface of the presser foot.
Is mounted, and the notched female screw of the valve box is
A ball valve having an external thread screwed therein.