JPH11257531A - Joint piston valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let two valves be surely combined with each other while preventing steam from leaking which is an advantage of a piston valve, in a joint valve in which two piston valves are combined with each other. SOLUTION: A piston 23 which is press moved by pneumatics, in provided for a first valve A, a first valve element 11 opening/closing a first valve hole 14 formed inside a valve main body 10, is provided for the piston, a second valve element 64 opening/closing a second valve hole 63 formed in a valve main body 60 is provided in a second valve B, both the first and second valve elements are faced to each other in a condition that the tip ends themselves of both the valve main bodies are combined with each other, and concurrently, the tip end of the first valve element abuts against the tip end of the second valve element by the opening action of the first valve element following by the press moved action of the piston, and the second valve element is opened, so that the first valve hole is thereby communicated with the second valve hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint piston valve used in a piping system such as a tire vulcanizing plant in which a fluid used is hot water or high-temperature steam.

[0002]

2. Description of the Related Art Conventionally, as a piston valve of this type, a piston cylinder provided with a piston which is pushed by air pressure is connected to a valve body, and an inlet and an outlet are connected to the inside of the valve body. A valve body that opens and closes the valve hole is provided at a distal end of a valve stem connected to the piston, and the valve body normally closes the first valve hole by retreating the piston. While being kept in a state, it is configured to be opened by pushing of the piston, so that the inflow port and the outflow port communicate with each other.

In a piping system of a tire vulcanizing plant, when steam is supplied from a single steam supply device to a large number of tire vulcanizing units, a fixed valve is provided on the steam supply device side. A moving-side valve is provided in each tire vulcanizing section, and the tire vulcanizer is moved to a steam supply position, where the moving-side valve is jointed to a fixed-side valve. Can be supplied with steam. It is preferable to use a piston valve that can reliably prevent steam from leaking out of a joint valve formed by a combination of such two valves. However, a joint valve using this piston valve has not been found in the past.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a joint valve formed by combining two valves using a piston valve. The joint valve is connected to the joint valve while reliably preventing steam leakage. An object of the present invention is to provide a joint piston valve that can perform the above-described operation.

[0005]

In order to solve the above-mentioned problems, a joint piston valve according to the present invention comprises a first valve and a second valve in which tip end surfaces of a valve body are coupled and separated at opposing positions. A piston cylinder in which a piston pushed by air pressure is provided is connected to the valve body of the first valve, and a first valve hole communicating between the inflow port and the outflow port is formed inside the valve body. A first valve body that opens and closes the first valve hole is provided at a distal end of a valve stem connected to the piston, and the first valve body normally closes the first valve hole due to retreat of the piston. On the other hand, a second valve hole communicating between the inflow port and the outflow port is formed inside the valve body of the second valve, and the second valve body that opens and closes the second valve hole is always operated by a spring. The first valve body and the second valve body are opposed to each other in a state where the front end surfaces of both valve bodies are connected to each other, and the first valve body and the second valve body are in contact with each other when the piston is pushed. With the opening operation of the valve element, the distal end of the first valve element and the distal end of the second valve element come into contact with each other, the second valve element is opened, and the first valve hole communicates with the second valve hole.

In this joint piston valve, for example, the first valve is used as a fixed-side valve and the second valve is used as a moving-side valve. In the separated state, both valves are closed.

In this case, when the two valves are separated from each other, the first
In the valve, the piston is retracted, and the first valve hole is closed by the first valve body provided at the distal end of the valve stem connected to the piston. The second valve hole of the second valve is closed by a second valve body biased by a spring.

[0008] The two valves are connected at their opposing positions with the end faces of the valve body.
The piston is pushed by air pressure, and the first valve hole provided at the tip of the valve stem opens the first valve hole. At the same time, the opening of the first valve element causes the tip of the first valve element to abut on the tip of the second valve element to open the second valve element, so that the first valve hole communicates with the second valve hole. I do.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a separated state of a joint piston valve according to one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing a joint state of the joint piston valve.

The joint piston valve includes a first valve A and a second valve B whose distal end surfaces of the valve body 10 are coupled and separated from each other at upper and lower positions.

The first valve A has a piston cylinder 20 connected to the valve body 10, and is pushed into the piston cylinder 20 by air pressure from an air inflow hole 21 and retreated by the urging of a return spring 22. A piston 23 is provided. This piston 23 has
A valve stem 24 penetrating from the piston cylinder 20 to the valve body 10 is connected, and a first valve body 11 is provided at a distal end of the valve stem 24. In the figure, reference numeral 25 denotes an air vent hole.

The pushing stroke of the piston 23 is controlled by a stroke checking mechanism 40. In this case, the indicator pin 41 is pushed up against the spring 42 by the pushing of the piston 23, and the MC dock 43 attached to the indicator pin 41 turns on the check switch 44 attached to the piston cylinder 20, whereby the piston 23 The push is stopped.

A first valve hole 14 is formed in the valve body 10 to communicate an inflow port 12 opened on a side surface of the valve body 10 and an outflow port 13 opened on an upper end surface of the valve body 10. The first valve hole 14 is opened and closed by the first valve body 11. That is, the piston 23
Is pushed by the air pressure from the air inlet hole 21, the first valve body 11 separates from the first valve hole 14 and the first valve hole 14 is opened, while the piston 23 is actuated by the bias of the return spring 22. When retracted, the first valve body 11
The first valve hole 14 is closed in close contact with the valve hole 14. The first valve element 11 is normally kept closed by closing the first valve hole 14 by retreating the piston 23.

The sealing structure of the valve stem 24 includes a gland 50, a V-shaped packing 51, a ring washer 52,
A packing spring 53 is provided in order, and by tightening a gland nut 54 from above the gland 50, the repulsive force of the packing spring 53 expands the V-shaped packing 51, thereby bringing the V-shaped packing 51 into close contact with the valve stem 24. It has become something.

Further, inside the second valve B, there is provided a second valve hole 63 communicating with an inflow port 61 opened at the lower end face of the valve body 60 and an outflow port 62 opened at the upper end face of the valve body 60. The second valve hole 63 is opened and closed by the second valve body 64. The second valve body 64 is normally urged by a spring 65 and is kept in a state in which the second valve hole 63 is closed. The second valve body 64
Are slidably fitted in the disk guide 66, and the lower end of the disk guide 66 has a
A number of semicircular notches 67 are formed on the inner peripheral surface as passages,
At the upper end of the disk guide 66, as shown in FIG. 4, an outflow port 62 having a large number of through holes is formed.

Next, the connection structure between the first valve A and the second valve B will be described. The first valve A includes a valve body 10
The upper end of the second valve B is formed in the concave connection part 68, while the second valve B has the lower end of the valve body 60 formed in the concave connection part 68. The projecting side coupling portion 15 has a seal ring 16 that slightly protrudes from the upper end surface of the valve body 10.
The seal ring 16 is attached by a guide nut 17 screwed to the upper end of the valve body 10. The first valve A is provided with a piston cylinder 2
0 is connected to a rod 7 of a coupling hydraulic cylinder (not shown) at the lower end.

Therefore, the first valve A and the second valve B are configured such that the convex connecting portion 15 of the first valve A is fitted into the concave connecting portion 68 of the second valve B by the operation of the connecting hydraulic cylinder. The sealing state is achieved by the seal ring 16 being in close contact with the receiving surface 69 of the concave-side connecting portion 68.

In this joint piston valve, the first
When the valve A and the second valve B are separated from each other, the first valve A
In the first embodiment, the piston 23 retreats, and the first valve hole 14 is closed by the first valve body 11 provided at the tip of the valve stem 24. The second valve B is provided with a spring 65
The second valve body 64 urged by the second valve body 64
3 is closed.

The first valve A and the second valve B are
In the coupled state, the piston 23 of the first valve A is pushed by air pressure, and the first valve body 11 opens the first valve hole 14. At the same time, the upper end surface of the first valve body 11 and the lower end surface of the second valve body 64 come into contact with each other by the opening operation of the first valve body 11 so that the second valve body 64 resists the spring 65. Then, the first valve hole 14 and the second valve hole 63 communicate with each other.

As a result, the fluid (steam or the like) supplied from the inlet 12 of the first valve A reaches the outlet 13 via the first valve hole 14, and further flows from the inlet 61 of the second valve B to the second port B. It is discharged from the outlet 62 through the valve hole 63.

[0021]

As described above, the joint piston valve of the present invention is constructed as described above, so that a joint valve can be constructed by combining two valves using the piston valve. Thus, it is possible to obtain an effect that the joint can be reliably formed while reliably preventing the leakage of steam, which is an advantage of the piston valve.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a separated state of a joint piston valve according to one embodiment of the present invention.

FIG. 2 is a sectional view showing a joint state of the joint piston valve.

FIG. 3 is a sectional view showing a lower end portion of a disc guide provided in a second valve of the joint piston valve.

FIG. 4 is a sectional view showing an upper end portion of the disc guide.

[Explanation of symbols]

 A first valve B second valve 10 valve body 11 first valve body 12 inflow port 13 outflow port 14 first valve hole 20 piston cylinder 23 piston 60 valve body 61 inflow port 62 outflow port 63 second valve hole 64 second valve Body 65 spring

Claims (1)

[Claims] 1. A first valve and a second valve in which tip end surfaces of a valve body are coupled and separated at opposing positions, and a piston which is pushed by air pressure is provided in the valve body of the first valve. A valve stem connected to a piston cylinder and having a first valve hole communicating the inflow port and the outflow port inside the valve body, and a first valve body that opens and closes the first valve hole is connected to the piston; The first valve body is normally held in a state in which the first valve hole is closed by the retreat of the piston. On the other hand, an inflow port and an outflow port are provided inside the valve body of the second valve. And a second valve body that opens and closes the second valve hole is normally urged by a spring to keep the second valve hole closed, and the first valve hole is opened. The body and the second valve body are The distal ends of the lube bodies face each other in a connected state, and the distal end of the first valve body and the distal end of the second valve body come into contact with each other due to the opening operation of the first valve body accompanying the pushing of the piston, so that the second valve A joint piston valve in which a body opens and a first valve hole and a second valve hole communicate with each other.