JPH0854936A - Pressure reducing valve - Google Patents

Abstract

PURPOSE:To provide a pressure reducing valve which can shorten its starting time at the secondary side at the beginning of feed of a fluid and also can completely close up its inlet and outlet when the fluid leaks out of its mouth part. CONSTITUTION:A mouth part 14 is formed between an inlet 11 and an outlet 12, and a bypass flower path 34 is bypassed to the part 14. A global valve member 35 is freely rotatably provided at the confluent part between the path 34 and the outlet 12. The path 34 is rectangularly bent, and a T-shaped communication hole 36 is formed at the inside of the member 35. The member 35 is turned at the beginning of feed of a fluid so that the inlet 11 and the outlet 12 communicate with each other via the path 34. When the fluid leaks out of the part 14, the member 35 is turned to shut off the inlet 11 and the outlet 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve which is attached to a piping system for steam, compressed air, liquid or the like to maintain a fluid pressure on the outlet side, that is, the secondary side of the valve, at a constant set pressure, and particularly to a bypass function The present invention relates to a device provided with a fully closed function.

A pressure reducing valve is installed immediately before a device using a fluid such as steam or compressed air to reduce the pressure of the fluid to an optimum pressure and supply the fluid to the device to improve the operating efficiency and productivity of the device. To improve the.

[0003]

2. Description of the Related Art A conventional pressure reducing valve is, for example,
-12007. This is because a valve opening is provided between the inlet and the outlet, and the pressure receiving response part detects that the outlet side pressure has dropped below the set pressure, and the inlet side pressure is supplied to the outlet side via the valve opening. In a pressure reducing valve for maintaining a side pressure at a set pressure, a bypass flow path connecting both openings is formed between an inlet and an outlet, and a valve member for opening and closing the bypass flow path is arranged.

[0004]

In the above-mentioned prior art, when the valve opening at the beginning of the fluid feeding is closed, the valve member is operated to open the bypass flow passage so that the fluid on the primary side is discharged to the secondary side. The passage time to the secondary side shortens the start-up time until the secondary side reaches the desired set pressure. However, in this case, when fluid leakage from the valve port occurs, there is a problem that the secondary pressure rises to the primary pressure with the passage of time. Therefore, it is a technical object of the present invention to provide a pressure reducing valve having a bypass function so that the inlet and the outlet are shut off to be completely closed.

[0005]

The technical means of the present invention taken to solve the above problems is that a valve opening is provided between an inlet and an outlet so that the pressure on the outlet side becomes lower than the set pressure. Is detected by the pressure receiving response part, and the inlet side pressure is supplied to the outlet side through the valve port to maintain the outlet side pressure at the set pressure.In a bypass flow that connects both ports between the inlet and outlet A passage is formed, and a valve member that connects the inlet and the outlet through a valve opening or the bypass passage and blocks the inlet and the outlet is rotatably arranged at the confluence with the outlet side of the bypass passage. It is what

[0006]

In the merging portion with the outlet side of the bypass flow passage, a valve member for connecting the inlet and the outlet via the valve opening or the bypass flow passage and for blocking the inlet and the outlet is rotatably arranged, so that the valve is By rotating the member, the inlet and the outlet can be communicated with each other through the valve port or the bypass flow passage, or the inlet and the outlet can be blocked.

At the beginning of fluid feeding, the inlet and the outlet are communicated with each other through the bypass flow passage so that the primary side fluid is allowed to pass through to the secondary side, and the startup time until the secondary side reaches a desired set pressure is set. Shorten. When the temperature of the entire fluid system rises sufficiently, the bypass passage is closed. When fluid leaks from the valve port, the inlet and outlet are shut off and the valve is completely closed.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). An inlet 11 and an outlet 12 are formed in the valve casing 10, and a valve seat member 13 attached to the valve casing 10 is provided with a valve port 14. A flat plate-shaped valve body 15 is arranged facing the valve opening 14 by a coil spring 17 via a valve body guide member 16 so as to be biased in a valve closing direction, and is joined to a connecting rod 19 of a piston 18 at an upper portion thereof. Piston 18 and connecting rod 1
A hemispherical portion 20 is formed between the portions 9.

The upper portion of the piston 18 is connected to the pilot valve chamber 22 via the communication passage 21. A pilot valve body 23 is arranged at the end of the pilot valve chamber 22 with a coil spring 24 biasing the valve body in the valve closing direction. The pilot valve body 23 portion communicates with the inlet 11 through the inlet pressure communication passage 25. The pilot valve body 23 has a pilot valve rod 26 connected to the upper portion thereof and joined to a diaphragm 27 as a pressure receiving response portion. The pressure on the outlet side acts on the lower surface chamber 28 of the diaphragm 27 by the outlet pressure communication passage 29. A coil spring 31 for pressure setting is provided on the upper surface of the diaphragm 27 via a diaphragm retainer 30.
To place. A pressure adjusting screw 33 is attached to the upper end of the coil spring 31 via a steel ball 32.

Inlet 11 and outlet 12 in valve casing 10.
A bypass flow passage 34 is formed between the two, and a spherical valve member 35 is arranged at the confluence portion of the bypass flow passage 34 on the outlet 12 side. The bypass flow path 34 is formed by bending at a right angle. Although not shown, the valve member 35 is arranged so as to be rotatable clockwise or counterclockwise by a handle provided on the front side of the drawing,
A T-shaped communication hole 36 is provided inside.

The operation is as follows. At the beginning of fluid feeding, the valve member 35 is rotated clockwise from the state shown in FIG.
The inlet 11 and the bypass passage 34 and the communication hole 36 are rotated.
The fluid on the primary side is supplied to the secondary side to shorten the startup time. in this case,
The valve member 35 may be rotated 90 degrees clockwise. When the temperature on the secondary side rises sufficiently, the valve member 35 is moved to the position shown in FIG.
Return to the state shown in. The bypass flow passage 34 is closed, and the normal pressure reducing operation state is set. Fluid leakage from the valve opening 14,
When the secondary pressure rises above the set pressure, the valve member 35 is rotated 90 degrees counterclockwise from the state shown in FIG. 1 to shut off the inlet 11 and the outlet 12 and completely close them.

When the valve member 37 is in the pivoted position of FIG.
Until the pressure on the secondary side reaches the set pressure, that is, the pressure set by the coil spring 31, the coil spring 3
The pilot valve element 23 is opened via the pilot valve rod 26 by the spring force of 1, and the high-pressure fluid on the inlet 11 side passes through the communication passages 25 and 21 and acts on the upper surface of the piston 18 to displace the piston 18 downward. To do. The valve body 15 opens due to the displacement of the piston 18, and the high pressure fluid on the inlet 11 side is replenished to the outlet 12 side, whereby the pressure on the secondary side rises. When the set pressure is reached, the load for pushing the diaphragm 27 upward and the load for pushing down the coil spring 31 are balanced, the pilot valve body 23 closes, and the valve body 15 also closes. When the pressure on the secondary side becomes lower than the pressure set by the coil spring 31, the pilot valve body 23 is opened, the piston 18 is displaced downward, the valve body 15 is opened, and the outlet 1 is opened.
By replenishing the high pressure fluid on the inlet 11 side to the 2 side, the pressure on the secondary side is raised to the set pressure.

[0013]

As described above, according to the present invention, the startup time on the secondary side can be shortened by rotating the valve member so that the inlet and the outlet communicate with each other through the bypass flow passage. Therefore, it is possible to improve the operation efficiency and productivity of the fluid using device on the secondary side. Further, by rotating the valve member to completely close the inlet and the outlet, abnormal pressurization on the secondary side can be prevented, and damage to the fluid use device on the secondary side can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a pressure reducing valve of the present invention.

[Explanation of symbols]

 11 Inlet 12 Outlet 14 Valve Port 15 Valve Body 18 Piston 23 Pilot Valve Body 27 Diaphragm 31 Coil Spring 33 Pressure Adjusting Screw 34 Bypass Flow Path 35 Valve Member 36 Communication Hole

Claims (1)

[Claims] 1. A valve opening is provided between the inlet and the outlet, the pressure receiving responsive portion detects that the outlet side pressure has dropped below a set pressure, and the inlet side pressure is supplied to the outlet side through the valve opening. In the pressure reducing valve that maintains the outlet side pressure at the set pressure, a bypass flow path that connects both ports is formed between the inlet and the outlet, and a valve port or bypass flow path is formed at the junction with the outlet side of the bypass flow path. A pressure reducing valve, characterized in that a valve member for connecting the inlet and the outlet via the valve and blocking the inlet and the outlet is rotatably arranged.