JPH0533874A - Ball valve - Google Patents

Abstract

PURPOSE:To provide a ball valve of no liquid stagnation by eliminating a direction of mounting the valve and further decreasing seat wearing in operation of opening/closing the valve. CONSTITUTION:In a ball valve 10 in which a valve chamber 19 is formed between a valve box 11 and a ball 14, a diameter of a through hole 20 provided in the ball 14 is contracted in a central part and also expanded in both end parts to provide the first communication path 41 extended in a direction orthogonal relating to a ball turning direction from a diameter contracted part 20A of the through hole 20 and connected to the valve chamber 19. Further, the second communication path 42, extended in a direction orthogonal relating to the ball turning direction from a diameter expanded part 20B of the through hole 20 and connected to the valve chamber 19, is provided so that an opening position in a ball external surface of the second communication path 42 is set to the outside of a ball seat diameter where an opening of the second communication path 142 is not brought into contact with ball seats 15, 16.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to ball valves.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a ball 2 that can open and close a flow path is rotatably disposed in a valve box 1. Ball seats 3 and 4 are attached to the ball 2 from both sides of the flow path. Contacted,
The ball seats 3 and 4 are pressed against the ball 2 by the ball retainers 5 and 6, and a ball valve that forms a valve chamber 7 between the valve box 1 and the ball 2 is adopted.

In this ball valve, the valve chamber 7 becomes a dead space that is cut off from the flow path when fully opened or fully closed. The fluid in this dead space tends to generate bacteria, and when hydrogen peroxide solution is used for pipe cleaning, the hydrogen peroxide solution remaining in the cleaning dead space flows out to the downstream side when the valve is opened and closed, and the fluid is contaminated. There is a risk of

Therefore, conventionally, when the valve is opened, fluid is allowed to flow through the through hole 8 inside the ball 2 and the outside valve chamber 7 at the same time.
A ball valve that does not cause a liquid pool in the valve chamber 7 has been proposed. In this ball valve, the through hole 8 inside the ball 2 is reduced in diameter in one direction from one end side to the other end side, and the through hole 8 and the valve chamber 7 are formed in the reduced diameter portion and the enlarged diameter portion of the ball 2. Communication passage 9 communicating with
A and 9B are opened.

[0005]

However, the prior art has the following problems. When the ball 2 is rotated along with the opening and closing of the valve, the range in which the ball 2 passes through the ball seat 3 is as indicated by H in FIG. 2 (B). Therefore, the communication passage 9A provided in the ball 2 is
The opening edge on the outer surface of the ball of 9B may wear the ball seats 3 and 4, and dust generated thereby may flow down to the flow path and pollute the fluid.

The through hole 8 provided in the ball 2 has a one-way tapered shape, and has the action of eliminating the liquid pool in the valve chamber 7.
Since it depends on the flow direction of the fluid, the mounting directionality of the valve occurs.

It is an object of the present invention to provide a ball valve which does not have a valve mounting directionality and which has less seat wear due to valve opening / closing operations and has no liquid pool.

[0008]

SUMMARY OF THE INVENTION The present invention provides a flow path within a valve box.
A ball that can be opened and closed is rotatably arranged.
Ball seats are abutted from both sides of the flow path.
The seat is pressed against the ball by the ball retainer.
A bow that forms a valve chamber between the valve box and the ball
In the valve, the diameter of the through hole provided in the ball is reduced at the center.
The diameter at both ends, and the
Is extended in a direction orthogonal to the rotation direction of the base and is connected to the valve chamber.
It has a first communicating passage through which the through hole extends from the enlarged diameter portion of the through hole.
Is extended in a direction orthogonal to the rotation direction of the base and is connected to the valve chamber.
A second communicating passage through which the ball is attached to the outer surface of the ball
The opening position in the ball seat is the opening of the second communication passage.
So that it is set outside the diameter of the ball seat
It is the one.

[0009]

According to the present invention, there are the following actions. The through hole of the ball has a tapered shape on both sides in which the diameter is reduced at the central portion and the diameter is increased at both ends, and the action of eliminating the liquid pool in the valve chamber is the same when the flow direction of the fluid is different. Therefore, there is no mounting direction of the valve.

The opening position provided on the outer surface of the ball of the communication passage provided in the ball is set outside the diameter of the ball seat where the opening of the communication passage does not contact the ball seat. Therefore, the opening edge on the outer surface of the ball of the communication passage does not wear the ball seat, and the dust generated from the ball seat does not flow down into the flow path to contaminate the fluid.

[0011]

1 is a schematic view showing an embodiment of the present invention, FIG.
[Fig. 4] is a schematic view showing a conventional example.

The ball valve 10 includes a flow path 12 in a valve box 11,
A ball 14 that can open and close 13 is rotatably arranged, and the ball 14 is provided in the ball 14 from the side of the flow paths 12 and 13.
The ball seats 15 and 16 are brought into contact with each other, and the ball seats 15 and 16 are pressed against the balls 14 by the ball retainers 17 and 18, so that the valve chamber 1 is provided between the valve box 11 and the ball 14.
9 is to be formed. Reference numeral 20 is a through hole provided in the ball 14.

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

The ball retainers 17 and 18 are screwed onto the inner diameters of both ends of the valve box 11. Union nuts 24 and 25 are screwed to the outer diameter portions of both ends of the valve box 11, and the union nuts 24 and 25 connect the connection sleeves 26 and 27 for connecting the pipe lines to the outer end surfaces of the ball retainers 17 and 18, respectively. Abutting.

Numerals 28 and 29 are the valve box 11 and the ball retainer 1.
O-rings provided between 7 and 18, 31 is an O-ring provided between the valve box 11 and the spindle 21, 32 and 33 are between the ball retainer 17 and the connecting sleeve 26, and between the ball retainer 18 and the connecting sleeve 27. It is an O-ring provided on the.

However, in the ball valve 10, the through hole 20 provided in the ball 14 is reduced in diameter in the central portion and expanded in both sides, and the ball is rotated from the reduced diameter portion 20A of the through hole 20. A first communication passage 41 that extends in a direction orthogonal to the direction and communicates with the valve chamber 19 is provided, and extends from the enlarged diameter portion 20B of the through hole 20 in a direction orthogonal to the ball rotation direction. A second communication passage 42 that communicates with the valve chamber 19 is provided. The opening position of the second communication passage 42 on the outer surface of the ball is the opening of the second communication passage 42 is the ball seat 15,
It is set outside the ball seat diameter H that does not contact the ball seat 16.

In the ball valve 10, when a fluid is flowed, the flow velocity of the reduced diameter portion 20A becomes faster than that of the enlarged diameter portion 20B, and the static pressure of the reduced diameter portion 20A is compared with that of the enlarged diameter portion 20B. And it will be significantly lower. Therefore, the reduced diameter portion 20A and the enlarged diameter portion 20
A pressure difference is generated between B, the fluid in the valve chamber 19 is sucked from the first communication passage 41 to the through hole 20 side in the reduced diameter portion 20A, and the fluid in the through hole 20 side is changed to the second communication portion in the enlarged diameter portion 20B. The fluid is ejected from the passage 42 into the valve chamber 12, and as a result, the fluid is passed through the through hole 20 and the valve chamber 1.
9 and 9 at the same time, and a fresh fluid can always be maintained without causing a liquid pool in the valve chamber 19. Therefore, the valve chamber 1
Bacteria are not generated in the chamber 9, and the hydrogen peroxide solution remaining in the valve chamber 19 does not flow out to the downstream side when the valve is opened and closed to contaminate the fluid.

Next, the operation of the above embodiment will be described. The through hole 20 of the ball 14 has a tapered shape on both sides, which has a diameter reduced at the central portion and an enlarged diameter at both ends, and the action of eliminating the liquid pool in the valve chamber 19 is the same even when the flow direction of the fluid is different. Is. Therefore, there is no mounting direction of the valve.

The opening positions of the communication passages 41 and 42 provided in the ball 14 on the outer surface of the ball are set outside the ball seat diameter H where the openings of the communication holes 41 and 42 do not contact the ball seats 15 and 16. .. Therefore, this ball valve 10
In this case, when the ball 14 is rotated with the opening and closing of the valve, the range in which the ball 14 passes through the ball seats 15 and 16 is as shown by H in FIG. 1 (B). Therefore, the communication passage 4
The opening edges of the ball outer surfaces of the ball seats 1, 42 do not wear the ball seats 15, 16 and
The dust generated from Nos. 5 and 16 does not flow down into the flow path to contaminate the fluid.

[0020]

As described above, according to the present invention, it is possible to obtain a ball valve which does not have a valve mounting directionality and which has less seat wear due to the opening / closing operation of the valve and has no liquid pool.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional example.

[Explanation of symbols]

 10 Ball valve 11 Valve box 12, 13 Flow path 14 Ball 15, 16 Ball seat 17, 18 Ball retainer 19 Valve chamber 20 Through hole 20A Reduced diameter portion 20B Expanded diameter portion 41 First communication passage 42 Second communication passage

Claims (1)

Claim: What is claimed is: 1. A ball which is capable of opening and closing a flow path is rotatably arranged in a valve box, and a ball seat is in contact with the ball from both sides of the flow path. In a ball valve that is pressed against a ball by a presser and forms a valve chamber between the valve box and the ball, the through hole provided in the ball is reduced in diameter at the center and expanded at both ends. A first communication passage extending from the reduced diameter portion of the through hole in a direction orthogonal to the ball rotation direction and communicating with the valve chamber,
And a second communication passage extending from the enlarged diameter portion of the through hole in a direction orthogonal to the ball rotation direction and communicating with the valve chamber,
The opening position on the outer surface of the ball of the second communication passage is the second position.
A ball valve in which the opening of the communication passage is set outside the diameter of the ball seat so as not to contact the ball seat.