JPS6221190Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston valve which has a valve body connected to a piston that is moved back and forth by fluid pressure, and whose flow path is switched by moving the valve body with the piston.

In conventional piston valves, if the internal valve body (valve, valve seat, piston, etc.) becomes worn out or damaged due to long-term use, the valve body must be removed from the equipment, piping line, etc. and disassembled for inspection, which often requires disassembly and inspection. In particular, when the valve body is installed in a location where it is difficult to remove, the time and cost required are enormous.

The present invention solves the above-mentioned conventional problems and provides a piston valve that is easy to maintain by allowing the piston, valve body, etc. to be inspected and replaced without removing the valve body from the equipment or piping line. The purpose is

The present invention achieves the above object by comprising a cylinder fitted into the cylindrical inner wall surface of a main body, and a sleeve fixed to the cylinder via a partition wall and fitted into a through hole of the main body, the cylinder having a piston attached thereto. A piston rod that is slidably inserted and guided through the partition wall is fixed to the piston, and a valve body portion is fixed to the free end of the piston rod, thereby forming one valve body cassette. However, when the valve body cassette is attached to the main body, the valve body part is movable so that it is seated on a seat surface formed on the main body and/or a seat surface formed on the sleeve end of the valve body cassette. This was achieved by means of a piston valve formed.

The details of the present invention will be explained based on an embodiment shown in the drawings.

In the figure, an example of a three-way piston valve will be explained. The main body 1 has a first fluid inlet 2 provided on the side of the main body, a fluid outlet 3, and a second fluid inlet 4 provided at the lower part of the main body in the figure. The first fluid inlet 2 communicates with a first chamber 5 formed inside the body 1, and the second fluid inlet 4 and the fluid outlet 3 each communicate with a second chamber 6 formed inside the body 1. ing. The first chamber 5 and the second chamber 6 are separated by a partition wall 1a and communicated with each other by a through hole 7 formed in the partition wall 1a. The first chamber 5 has a cylindrical inner wall surface 9 that is open to the outside through the opening 8 of the main body 1 . The cylindrical inner wall surface 9, the through hole 7, and the flow path communicating with the second fluid inlet 4 are formed as concentric cylindrical surfaces.

A valve body cassette 10 is inserted into the main body 1 from an opening 8.
has been inserted.

The valve body cassette 10 includes a cylinder 11 fitted into the inner wall surface 9, a partition wall 12 fixed to the inner end of the cylinder 11, a sleeve 13 fixed to the inner end of the partition wall 12, and a cylinder 11 inside the cylinder 11. A piston 14 is slidably guided, and the partition wall 12 is fixed to the piston by any fixing means such as screwing.
a piston rod 15 that is slidable through the
Stepped small diameter tip rod portion 1 of the piston rod 15
The valve body part 16 inserted into the piston rod 15 and the valve body retaining nut 1 screwed onto the tip of the piston rod 15 in order to fix the valve body part 16 to the piston rod 15.
It consists of 7. The valve body cassette 10 can be attached to and detached from the main body 1 as a whole. The valve body portion 16 includes a valve retainer 18 inserted into the tip rod portion 15a of the piston rod 15, a valve receiver 19 which is clamped and fixed between the valve retainer 18 and the valve retainer nut 17, and both ends of the valve retainer 19. It consists of a ring-shaped first valve 20 and a second valve 21 fixed to the section.

The outer peripheral surface of the free end of the sleeve 13 is formed as a seat portion 24 having an outer cylindrical surface 22 that fits into the through hole 7 and a conical seat surface 23 to which the first valve 20 is joined. 24 has a through hole 7 in the seat portion 24 that abuts the through hole 7 and is in contact with the through hole 7.
A flange portion 25 is formed which performs a positioning action against the flange portion. The sleeve 13 is formed in a hollow shape, and an arbitrary opening 26 is provided on the circumferential surface so that the inside of the sleeve 13 and the first chamber 5 are in communication.

The cylinder 11, the partition wall 12 and the sleeve 13
The whole can also be formed integrally.

A conical seat surface 27 is provided at the inner end of the flow path communicating with the second fluid inlet 4 of the main body 1 .
1 can be seated.

The valve body 16 is located in the second chamber 6 and moves up and down in the figure so that the first valve 20 is seated on the seat surface 23.
The second valve 21 can be switched between a first position in which the second valve 21 seats on the seat surface 27 and a second position in which the second valve 21 seats on the seat surface 27 .

The valve body retaining nut 17 is connected to the second fluid inlet 4.
It has a wing part 17a whose outer circumferential surface is a part of a cylindrical surface that can be slidably fitted into a cylindrical flow path leading to the cylindrical flow path, and a space between adjacent wing parts is formed as a fluid passage. . The wing portion also functions as a guide when the valve body cassette 10 is inserted.

After inserting the valve body cassette 10
is fixedly held within the main body 1 by fixing the lid 28 to the main body 1 with bolts 29 and closing the opening 8. At this time, the end surface of the cylinder 11 constituting the valve body cassette 10 comes into contact with the lid 28 and is pressed inward.

The lid 28 is provided with a first connection port 30 connected to a fluid source, and the piston 14 and the lid 28 are connected to the piston 14 through the connection port 30.
Fluid can flow into the chamber formed between the two.

A second connection port 31 is formed in a portion of the main body 1 corresponding to the partition wall 12 and can be connected to a fluid source.
Fluid can be introduced into the chamber between the piston 14 and the piston 14 .

When fluid is supplied from the first connection port 30, the piston 14 descends in the figure, so the valve body 16 descends and the second valve 21 comes into contact with the seat surface 27 in the second position, and the fluid outlet 3 and the second fluid inlet 4 are cut off. At this time, the first fluid inlet 2 and the fluid outlet 3 communicate with each other through the first chamber 5 and the inside of the sleeve 13, and the fluid flows from the first fluid inlet 2 to the fluid outlet 3.

When fluid is supplied from the second connection port 31, the piston 14 rises in the figure, and therefore the valve body portion 16 moves from the second position to the first position. At this time, the first fluid inlet 2 and the fluid outlet 3 are cut off, and the fluid flows from the second fluid inlet 4 to the fluid outlet 3. That is, the flow path of the valve is switched by the operation of the piston.

The fluid inlets 2, 4 are also used as outlets. Depending on the case, the flow of fluid may be switched by using port 3 as a fluid inlet and ports 2 and 4 as fluid outlets.

The opening relationship between the second connection port 31 and the flow path in the partition wall 12 can be designed arbitrarily, but as an example, a ring groove 32 is formed at a position on the outer periphery of the partition wall 12 at a position where it can communicate with the second connection port 31. An L-shaped flow path 33 is formed that communicates with the ring groove 32 and the opening in the inner end surface of the partition wall.

Although sealing members will not be specifically explained, sealing members are provided in all parts where it is necessary to prevent fluid leakage.

A bolt 29 is attached to the outer end surface of the piston 14 to facilitate the operation of removing the valve body cassette from the main body 1.
The same screw hole 34 is formed, and a bolt 29 or the like is screwed into the hole 34 so that the whole can be pulled out.

In the valve body cassette 10, the radius of the fluid contact surface of the piston 14 is made larger than the radius of the fluid contact surface of the valve body portion 16, so that the valve body can be easily switched and moved with a small amount of fluid pressure.

With this invention, the piston and valve as a whole form one cassette and can be easily attached and removed, so if a replacement valve body cassette is prepared, the valve body and piston can be replaced in a short time, making maintenance and repair inspection easier. . There is no need to remove non-faulty parts such as the main body, which significantly improves work efficiency.

It should be noted that the present invention is not limited to the example shown in the figures, but can also be applied to an on-off valve having two inlets and outlets, and a switching valve having four or more inlets and outlets.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a piston valve according to the present invention. 1... Main body, 2, 3, 4... Fluid inlet/outlet, 5...
...First chamber, 6...Second chamber, 7...Through hole, 8...
Opening, 9... Cylindrical inner wall surface, 10... Valve body cassette, 11... Cylinder, 12... Partition wall, 13
... Sleeve, 14 ... Piston, 15 ... Piston rod, 16 ... Valve body part, 17 ... Valve body locking nut, 21, 21 ... Valve, 23 ... Seat surface, 27 ... Seat surface, 28 ... ... Lid, 30 ... Connection port, 31 ... Connection port, 33 ... Channel, 1a ...
Partition wall.

Claims (1)

[Claims for Utility Model Registration] (1) A room partition wall having at least two fluid inlets/outlets, a plurality of chambers communicating with each fluid inlet/outlet, a through hole communicating between the chambers, and an opening open to the outside. a main body having a cylindrical inner wall surface formed concentrically with the through hole and continuous with one of the chambers; a valve body cassette that can be inserted into and extracted from the main body through the opening; A lid that can be fixed to the main body so as to cover the opening is provided, a cylinder in which the valve body cassette is fitted into a cylindrical inner wall surface of the main body, a sleeve to be fitted in the through hole, and the cylinder. a partition separating the piston from the sleeve; a piston slidably inserted into the cylinder; and a piston rod fixed to the piston, slidably guided through the partition, and extending through a hollow portion of the sleeve. and a valve body portion secured to a free end of the piston rod, the valve being disposed at at least one of the sleeve end and one or more ends of a flow passage communicating with a fluid inlet/outlet of the body. A seat surface is formed on which the valve of the body can be seated, and a flow path through which fluid can flow into the chambers on both sides of the piston is formed in the lid and the partition wall, and the flow path is connected to the lid and the main body, respectively. A piston valve that communicates with a fluid connection port formed in a piston valve, wherein the cylinder, the partition wall, and the sleeve are fixed to each other or formed integrally with each other. (2) the valve body portion is fixed to the piston rod by a valve body retaining nut, and the valve body retaining nut is slidably fitted into a flow path communicating with one of the fluid inlets and outlets; A seat surface is formed at an inner end of the flow path and an end of the sleeve, two valves are formed in the valve body, and between two positions where the valve body is seated on each of the two seat surfaces. The piston valve according to claim 1, which is capable of being switched and moved.