JPH0445044Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a pressure reducing valve, and in particular, a direct-acting valve used in a pneumatic circuit, etc., which returns pressure fluctuations in a secondary flow path by displacement of a diaphragm. Regarding the shape of the pressure reducing valve.

[Prior Art] Conventionally, the following structures have been proposed as such direct-acting pressure reducing valves.

That is, a primary flow path and a secondary flow path are coaxially opposed to each other at both ends of the main body, and a direction perpendicular to the axis of the primary flow path and secondary flow path is formed on the side surface of the main body. A bonnet for fixing the diaphragm is attached to the diaphragm, and a diaphragm chamber communicating with the secondary flow path is formed between the diaphragm and the side surface of the main body.

The valve body is located coaxially with the bonnet and the diaphragm within the main body, and the displacement of the diaphragm is fed back to the valve body by a stem whose one end is integrated with the valve body and the other end is in contact with the diaphragm. At the same time, the displacement of the pressure adjustment handle screwed onto the outer periphery of the bonnet is applied to the diaphragm via a pressure adjustment spring, etc., so that the set value of the fluid pressure in the secondary flow path by the pressure adjustment handle is stabilized. It was designed to be maintained.

[Problems to be solved by the invention] However, in the pressure reducing valve with the above structure, the bonnet, pressure regulating handle, etc. intersect with the axes of the primary flow path and the secondary flow path connected to the piping. Since it protrudes in the direction, it has the disadvantage that it requires a larger space than necessary in the width direction for attachment to piping, operation, etc.

In particular, when multiple series of pipes are adjacent to each other and pressure reducing valves are installed in the same part of each pipe, the distance between adjacent pipes must be set large, and the dimensions of the entire piping system will be reduced. This causes the problem of increasing the size.

An object of the present invention is to provide a pressure reducing valve that can reduce the space required for installation and adjustment operations.

Another object of the present invention is to provide a pressure reducing valve that can achieve rapid relief action without increasing the space required for installation and adjustment operations.

[Means for Solving the Problems] The pressure reducing valve of the present invention includes a main body, an inlet piping adapter and an outlet arranged at both ends of the main body, in which the primary flow path and the secondary flow path are coaxially opened. A bonnet that is interposed coaxially with the primary flow path and the secondary flow path between the piping adapter, the main body and the outlet piping adapter, and is open to external space, and a bonnet that is open to the outside space, and a A main valve part that is composed of a valve seat that is coaxial with the flow path and a valve body that is displaced in the axial direction of the valve seat, and that adjusts the fluid pressure that flows out from the primary flow path to the secondary flow path; The pressure regulating mechanism includes a diaphragm chamber formed between the main body and the bonnet, and a diaphragm driven by the fluid pressure of the secondary flow path acting on the diaphragm chamber. It penetrates the diaphragm coaxially with the primary flow path and the secondary flow path, one end contacts the valve body through the valve seat, the other end communicates with the secondary flow path, and the enlarged diameter portion penetrates the diaphragm. A pressure regulating tube that transmits the displacement of the diaphragm to the valve body by being locked to a diaphragm seat provided in the valve body, and a pressure regulating tube that is screwed to the bonnet coaxially with this pressure regulating tube and that is connected to the shaft of the pressure regulating tube from the outside. A pressure regulating handle displaces the diaphragm and the pressure regulating tube via a pressure regulating spring when rotated around the diaphragm chamber, and a pressure regulating handle provided at the insertion part of the pressure regulating tube in the diaphragm chamber, and a pressure regulating handle displacing the diaphragm and the pressure regulating tube through the pressure regulating spring; It has a structure consisting of a pilot hole that applies pressure, and a relief valve that discharges the fluid in the secondary flow path to the external space through the diaphragm chamber by the movement of the expanded diameter part of the pressure regulating tube and the diaphragm seat toward and away from each other. be.

[Function] According to the above means, the main body, the inlet piping adapter, the outlet piping adapter, the bonnet, the main valve part, the pressure regulating mechanism, etc. are arranged coaxially on the axis connecting the primary flow path and the secondary flow path. With this configuration, there is no member protruding in the direction intersecting the axis of the piping connected to the primary flow path and the secondary flow path, and
The pressure adjustment operation is performed by rotating the pressure adjustment handle that constitutes the pressure adjustment mechanism around the axis that connects the primary flow path and the secondary flow path. Space can be reliably reduced.

In addition, by configuring the pressure regulating mechanism and forming a relief valve at the insertion part of the pressure regulating pipe that is coaxial with the axes of the primary flow path and the secondary flow channel through the diaphragm, the relief valve can be operated using the surrounding area of the pressure regulating pipe. The degree of opening of the pipe can be made relatively large, and there is no need to provide any protruding objects in the direction that intersects the axis of the piping connected to the primary flow path and the secondary flow path. without increasing space
Achieves quick relief action.

[Embodiment] The figure is a sectional view of a pressure reducing valve that is an embodiment of the present invention.

An inlet piping adapter 3 in which a primary flow path 2 connected to a predetermined fluid pressure source (not shown) is formed is screwed onto one axial end of the main body 1 so as to be substantially coaxial with the main body 1. There is.

Furthermore, a plug 4 is press-fitted into the inside of the inlet piping adapter 3, and a guide portion 5 is provided in the center of the plug 4 in the axial direction of the inlet piping adapter 3.
An end portion of the valve body 6 is slidably inserted in the axial direction of the main body 1.

The valve body 6 is biased by a valve spring 7 and is brought into close contact with a valve seat 8 provided in the axial direction inside the main body 1, thereby forming a main valve portion V1.

A plurality of through holes 4a are formed in the peripheral part of the plug 4, and through these through holes 4a, a fluid chamber A is formed between the main body 1 and the inlet piping adapter 3, and in which the valve body 6 is located. Connected to Route 2.

A bonnet 9 is screwed in the axial direction of the main body 1 at a position facing the inlet piping adapter 3 screwed onto the main body 1, and furthermore, at the end of this bonnet 9, a secondary flow passage 10 is axially connected. The outlet piping adapter 11 formed in the direction is fixed by a plurality of bolts 12 so as to be substantially coaxial with the main body 1, the inlet piping adapter 3, and the bonnet 9.

A diaphragm 13 (pressure regulating mechanism) is provided between the bonnet 9 and the main body 1 with its peripheral portion in close contact with the main body 1, and a diaphragm chamber B is formed between the diaphragm 13 and the main body 1. .

Further, in the central axis direction inside the bonnet 9, it passes through the diaphragm 13 and the center part of the main body 1, and one end communicates with the secondary flow path 10, and the other end passes through the center part of the valve seat 8 and connects the valve body. A pressure regulating pipe 14 (pressure regulating mechanism) that comes into contact with the pressure regulating pipe 6 is provided so as to be freely displaceable in the axial direction.

In addition, a plurality of through holes 14a are formed in the end wall surface of the pressure regulating pipe 14 that comes into contact with the valve body 6, and the pressure regulating pipe 14 is displaced in the axial direction, resisting the biasing force of the valve spring 7. By forming a gap in the main valve part V1 made up of the valve body 6 and the valve seat 8, fluid such as compressed air flowing into the fluid chamber A from the primary flow path 2 can flow through the main valve part V1 and the through hole. 14a, pressure regulating pipe 14
It has a structure in which it flows out into the secondary side flow path 10 through the inside of the .

A flange-shaped enlarged diameter portion 14b is provided at the insertion portion of the pressure regulation tube 14 in the diaphragm chamber B, and this diameter enlarged portion 14b has a pilot hole 15 (regulation pressure mechanism) is formed.

The enlarged diameter portion 14b is attached to the diaphragm sheet 13a provided in the center of the diaphragm 13.
is removably locked, the displacement of the diaphragm 13 is transmitted to the valve body 6 via the pressure regulating pipe 14, and a relief valve V2 (pressure regulating mechanism ), and when the enlarged diameter portion 14b separates from the diaphragm sheet 13a, the pilot hole 15
and through the diaphragm chamber B, the secondary flow path 1
0 fluid is appropriately discharged to the outside.

Further, on the outer circumferential portion of the bonnet 9, there is a pressure regulating handle 16 which is displaced in the axial direction by being rotated around the axis of a pressure regulating tube 14 which is inserted from the outside in the axial direction through the inside of the bonnet 9. (Pressure adjustment mechanism) is provided, and the displacement of the pressure adjustment handle 16 is controlled by projecting outward in the radial direction from a guide groove 9a formed in the axial direction of the bonnet 9 and engaging the pressure adjustment handle 16. The diaphragm 13
and is configured to be transmitted to the pressure regulating pipe 14.

Further, the internal space of the bonnet 9 is opened to the outside through the guide groove 9a formed in the side wall of the bonnet 9.

The operation of this embodiment will be explained below.

First, the inlet piping adapter 3, which is coaxially provided at both ends of the main body 1 of the pressure reducing valve, and in which the primary side flow path 2 is formed, and the outlet side piping adapter 11, in which the secondary side flow path 10 is formed, are arranged in a predetermined manner. In the middle of piping,
The main body 1 is connected to the upstream side where a predetermined air pressure source (not shown) is installed and the downstream side where a cylinder device (not shown) that uses air pressure is installed, and the main body 1 is connected in the same direction as the axis of the piping. It will be installed.

Next, the pressure regulating handle 16 provided in the axial direction of the main body 1, that is, the axial direction of the piping, is appropriately rotated in a predetermined direction around the axis of the main body 1, so that the spring retainer 17 approaches the diaphragm sheet 13a. When the pressure regulating pipe 14, which is locked to the diaphragm seat 13a via the pressure regulating spring 18, moves in the direction of entering the main body 1, the valve body 6 that the pressure regulating pipe 14 comes into contact with is moved by the valve spring. The main body 1 is displaced in the axial direction against the urging force 7. As a result, the main valve section V1
A fluid passage is formed between the valve body 6 and the valve seat 8 that constitute the main valve part V1, and the fluid such as compressed air acting on the primary flow passage 2 is reduced to a predetermined pressure depending on the opening degree of the main valve part V1. and flows out into the secondary flow path 10 through the through hole 14a of the pressure regulating pipe 14 and the inside of the pressure regulating pipe 14.

At this time, the fluid pressure in the secondary flow path 10 acts on the diaphragm 13 through the pilot hole 15, and is applied to the diaphragm 13 and the diaphragm 13 at a position balanced with the biasing force of the pressure regulating spring 18 acting on the diaphragm sheet 13a. The axial displacement of the locked pressure regulating pipe 14 is stopped, and the opening degree of the valve body 6 with which the pressure regulating pipe 14 comes into contact becomes stable.

Then, when the fluid pressure in the secondary flow path 10 changes from the set pressure due to a change in fluid consumption in the secondary flow path 10, for example,
The above balanced state is broken and the pressure regulating tube 1 is locked to the diaphragm 13 and the diaphragm sheet 13a.
4 is connected to the secondary flow path 1 by the biasing force of the valve spring 7.
Diaphragm 1 according to changes in air pressure at 0
The cross-sectional area of the fluid passage between the valve body 6 and the valve seat 8, that is, the opening degree of the main valve portion V1, which moves as appropriate following the axial displacement of the valve body 6 and is displaced together with the pressure regulating pipe 14, changes as described above. The fluid pressure in the secondary flow path 10 is stably maintained at a predetermined value by changing in the counteracting direction.

Furthermore, when fluid consumption stops in the secondary flow path 10, the diaphragm 13 and the diaphragm sheet The pressure regulating pipe 14 held by the pressure regulating tube 13a is displaced in the direction of protruding to the outside of the main body 1 against the biasing force of the pressure regulating spring 18, and the valve element 6 and valve seat 8 of the main valve portion V1 are brought into close contact with each other, and the primary Fluid flow from the side flow path 2 to the secondary flow path 10 is blocked.

At this time, if fluid leaks between the valve body 6 and the valve seat 8, for example, the fluid pressure in the secondary flow path 10 will rise abnormally; The abnormal rise further displaces the diaphragm 13 through the pilot hole 15, causing the diaphragm seat 13a and the enlarged diameter portion 14 of the pressure regulating tube 14 to
Relief valve V2 consisting of An abnormally large air pressure acting on the passage 10 is avoided.

As described above, in this embodiment, the valve element 6 that adjusts the fluid pressure flowing out from the primary flow path 2 to the secondary flow path 10, and the diaphragm 13, penetrate through the diaphragm 13 and have one end connected to the valve element. 6, the other end communicates with the secondary flow path 10, and transmits the displacement of the diaphragm to the valve body 6;
The diaphragm 13 is rotated from the outside around the axis of the pressure regulating tube 14 through the pressure regulating spring 18.
and a pressure adjustment handle 16 that displaces the pressure adjustment pipe 14
Since the axis of the pressure regulating mechanism consisting of the above-mentioned pressure regulating mechanism etc. is provided in the same direction as the flow direction of the fluid from the primary side passage 2 to the secondary side passage 10 through the inside of the pressure regulating pipe 14, However, it does not protrude in the direction of fluid flow, that is, in the direction that intersects the axial direction of the piping, and the dimensions of the pressure reducing valve itself in the direction that intersects with the axial direction can be reduced, reducing the space required for installation and operation. can be made smaller.

Therefore, for example, when installing a pressure reducing valve in each of a plurality of adjacent pipes, the distance between the pipes can be made closer, and the dimensions of the piping system in which the pressure reducing valve is installed can be reduced. can be converted into

In particular, by making the axis of the pressure regulating mechanism and the fluid flow direction coaxial as in the above embodiment, the dimension in the direction intersecting the axial direction can be minimized.

In addition, a pressure regulating pipe 14 passing through the diaphragm 13
By forming the relief valve V2 with the enlarged diameter portion 14b and the diaphragm seat 13a that is engaged with the enlarged diameter portion 14b, the flow rate of fluid discharged from the diaphragm chamber B to the outside can be made relatively large. This allows quick relief action to be performed.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

[Effects of the invention] (1) A main body, an inlet piping adapter and an outlet piping adapter arranged at both ends of the main body, each having a primary flow path and a secondary flow path coaxially connected to the main body and the outlet. a bonnet interposed between the piping adapter and coaxial with the primary flow path and the secondary flow path and open to the external space; and a bonnet coaxial with the primary flow path and the secondary flow path within the main body. a main valve part that is composed of a valve seat opened in the valve seat and a valve body that is displaced in the axial direction of the valve seat, and that adjusts the fluid pressure flowing out from the primary side flow path to the secondary side flow path; and the valve body A diaphragm chamber is formed between the main body and the bonnet, and the pressure regulation mechanism is driven by the fluid pressure of the secondary flow path acting on the diaphragm chamber. a diaphragm penetrating the diaphragm coaxially with the primary flow path and the secondary flow path, one end of which abuts the valve body through the valve seat, and the other end communicates with the secondary flow path;
a pressure regulating tube whose enlarged diameter portion is locked to a diaphragm seat provided in a penetrating portion of the diaphragm to transmit displacement of the diaphragm to the valve body; and a pressure regulating tube coaxially with the pressure regulating tube and screwed onto the bonnet. a pressure regulating handle that displaces the diaphragm and the pressure regulating tube via a pressure regulating spring when rotated from the outside around the axis of the pressure regulating tube; A pilot hole is opened to apply the fluid pressure of the secondary flow path to the diaphragm chamber, and a movement of the expanded diameter part of the pressure regulating tube and the diaphragm sheet toward and away from each other causes the fluid pressure of the secondary side flow path to be applied to the diaphragm chamber through the diaphragm chamber. Since the structure consists of a relief valve that discharges the fluid in the flow path to the outside space, the pressure regulating mechanism etc. protrude in a direction that intersects the axis of the piping connected to the primary flow path and the secondary flow path. Moreover, since the pressure adjustment operation is performed by rotating the pressure adjustment handle around the axes of the coaxial primary and secondary flow paths, it is possible to adjust the pressure in the axial direction of the pressure reducing valve itself. The dimensions in the intersecting direction can be reduced, and the space required for installation, operation, etc. can be reduced.

Furthermore, since the relief valve is formed by the diaphragm seat provided in the penetration part of the diaphragm and the enlarged diameter part of the pressure regulating pipe that is locked to the diaphragm seat, a relatively large relief flow rate can be obtained. A quick relief action can be performed.

(2) As a result of (1) above, for example, when a pressure reducing valve is installed in each of a plurality of adjacent pipes, the mutual spacing between adjacent pipes can be made closer; The dimensions of the piping system can be reduced.

[Brief explanation of the drawing]

The figure is a sectional view of a pressure reducing valve that is an embodiment of the present invention. 1...Main body, 2...Primary side flow path, 3...Inlet piping adapter, 4...Plug, 4a...Through hole, 5
...Guide section, 6...Valve body, 7...Valve spring, 8...
Valve seat, 9... Bonnet, 9a... Guide groove, 10
... Secondary flow path, 11 ... Outlet piping adapter, 1
2...Bolt, 13...Diaphragm (pressure regulating mechanism), 13a...Diaphragm sheet, 14...
Pressure regulating pipe (pressure regulating mechanism), 14a...through hole, 14b
... Expanded diameter part, 15 ... Pilot hole (pressure regulation mechanism),
16... Pressure regulation handle (pressure regulation mechanism), 17... Spring holder, 18... Pressure regulation spring (pressure regulation mechanism), A...
...Fluid chamber, B...Diaphragm chamber, V1...Main valve section, V2...Relief valve (pressure regulating mechanism).

Claims (1)

[Scope of utility model registration request] A main body, an inlet piping adapter and an outlet piping adapter arranged at both ends of the main body, each having a primary flow passage and a secondary flow passage coaxially opened, and the primary pipe between the main body and the outlet piping adapter. a bonnet disposed coaxially with the side flow path and the secondary flow path and open to the external space; a valve seat provided in the main body coaxially with the primary flow path and the secondary flow path; A main valve part consisting of a valve body displacing in the axial direction of the valve seat and adjusting the fluid pressure flowing out from the primary side flow path to the secondary side flow path, and a pressure regulating mechanism that drives the valve body. , the pressure regulating mechanism includes a diaphragm that forms a diaphragm chamber between the main body and the bonnet, and is driven by fluid pressure in the secondary flow path acting on the diaphragm chamber;
It penetrates the diaphragm coaxially with the primary flow path and the secondary flow path, one end contacts the valve body through the valve seat, and the other end communicates with the secondary flow path, and the enlarged diameter portion a pressure regulating pipe that transmits the displacement of the diaphragm to the valve body by being engaged with a diaphragm seat provided in a penetrating portion of the diaphragm; a pressure regulating handle that displaces the diaphragm and the pressure regulating tube via a pressure regulating spring when rotated around the axis of the pressure regulating tube; a pilot hole for applying fluid pressure of the secondary flow path to the chamber;
A pressure reducing valve comprising: a relief valve that discharges fluid in the secondary flow path to an external space through the diaphragm chamber by contacting and separating the enlarged diameter portion of the pressure regulating pipe and the diaphragm seat.