JP5839676B2 - Pressure reducing valve - Google Patents

Description

The present invention relates to a pressure reducing valve that is attached to a fluid piping system such as steam, compressed air, or liquid, and maintains the fluid pressure on the outlet side of the valve, that is, the secondary side of the valve at a constant set pressure.

A conventional pressure reducing valve is disclosed in Patent Document 1, for example. This is a valve casing that forms an inlet, a valve port, and an outlet, and a main valve is disposed opposite the valve port, and the main valve cooperates with the piston to open and close the valve port, A partition cylinder that separates the outlet side space between the valve port and the piston and the outlet is provided, and a plurality of communication holes having a total opening area equal to the valve port area are formed at equal intervals in the partition cylinder.

Japanese Utility Model Publication No. 62-100514

The conventional pressure reducing valve is provided with a partition cylinder separating the outlet side space between the valve port and the piston and the outlet, and a plurality of communication holes having a total opening area equal to the valve port area are formed in the partition cylinder at equal intervals. In order to prevent the piston from tilting, the fluid preferentially flows out from the communication hole facing the outlet, so that the piston tilt cannot be completely prevented, leaving room for improvement. Met.

Therefore, the problem to be solved by the present invention is to provide a pressure reducing valve that can prevent the piston from tilting.

In order to solve the above problems, a pressure reducing valve according to the present invention forms an inlet, a valve opening, and an outlet in a valve casing, and disposes a main valve facing the valve opening, and the main valve cooperates with a piston. The valve opening is opened and closed, and a partition cylinder is provided to separate the outlet side space between the valve opening and the piston from the outlet, and a communication hole whose total opening area is equal to the valve opening area is provided in the partition cylinder. In the case where a plurality of holes are formed at equal intervals, the communication holes are formed only on both sides in the direction perpendicular to the outlet.

According to the present invention, the plurality of communication holes formed in the partition cylinder are formed only on both sides in the direction perpendicular to the outlet, so that the high-pressure fluid from the valve port toward the outlet acts equally on the piston in the partition cylinder. There is an effect that it is possible to prevent the piston from being inclined by being discharged from the communication hole to the outlet.

It is sectional drawing of the pressure reducing valve concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. An inlet 2 and an outlet 3 are formed in the valve casing 1, and a valve port 5 is formed in a valve seat member 4 screwed to the valve casing 1. The main valve 6 that opens and closes the valve port 5 is arranged by being biased by a coil spring 17 in the valve closing direction. The lower valve shaft 6 a of the main valve 6 is guided in the axial direction by the guide hole 1 b of the bottom wall 1 a of the valve casing 1. The lower surface of the lower valve shaft 7a of the piston 7 contacts the upper surface of the main valve 6. The piston 7 has a hemispherical portion 7b protruding downward at the upper end on the central axis of the lower valve shaft 7a. The piston chamber 9 at the upper part of the piston 7 is connected to the pilot valve chamber 14 via the communication path 13. The pilot valve chamber 14 is connected to the inlet 2 via the inlet pressure communication path 32. A partition cylinder 10 is provided to separate the outlet side space 8 between the valve port 5 and the piston 7 and the outlet 3, and a communication hole 11 having a total opening area equal to the valve port area is formed in the partition cylinder 10 in a direction perpendicular to the outlet 3. On both sides of the paper, the front side and the other side are formed.

A pilot valve 12 that blocks communication between the inlet pressure communication path 32 and the communication path 13 is disposed in the pilot valve chamber 14 between the inlet pressure communication path 32 and the communication path 13. The upper end of the pilot valve 12 abuts on the center of the lower surface of the diaphragm 21 as a pressure receiving response portion. As the diaphragm 21 moves up and down, the pilot valve 12 is opened and closed to cut off the communication between the inlet pressure communication path 32 and the communication path 13. The elastic force of the pressure setting spring 23 acts on one surface of the diaphragm 21 via the diaphragm retainer 22. A pressure adjusting screw 24 is attached to the upper end of the pressure setting spring 23 via a steel ball 25. The secondary side pressure from the secondary pressure detection passage 31 communicating from the secondary side of the valve port 5 is acting on the lower surface chamber 30 on the other surface of the diaphragm 21.

The operation of the pressure reducing valve is as follows. When the pressure on the outlet 3 side falls below the set pressure set by the pressure setting spring 23, the pilot valve 12 is opened via the diaphragm 21 by the spring force of the pressure setting spring 23, and the high-pressure fluid on the inlet 2 side is connected to the communication path. The piston 7 is displaced downward by acting on the upper surface of the piston 7 through 32 and 13. The main valve 6 is moved away from the valve seat member 4 due to the displacement of the piston 7, the valve port 5 is opened, and the high pressure fluid on the inlet 2 side is supplied to the outlet 3 side, whereby the pressure on the outlet 3 side rises to the set pressure. To do. The high-pressure fluid heading from the valve port 5 toward the outlet 3 is discharged from the communication hole 11 to the outlet 3 while acting equally on the piston 7 in the partition cylinder 10, so that the piston 7 can be prevented from tilting. When the set pressure is reached, the load that pushes up the diaphragm 21 upward and the push-down load by the pressure setting spring 23 are balanced, and the pilot valve 12 closes, and the high-pressure fluid in the piston chamber 9 escapes from the orifice 27 to the outlet 3 side. 7 is displaced upward. The main valve 6 is seated on the valve seat member 4 by the displacement of the piston 7 to close the valve port 5.

The present invention can be applied to a pressure reducing valve that is attached to a fluid piping system and maintains the fluid pressure on the outlet side of the valve, that is, the secondary side of the valve at a constant set pressure.

DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inlet 3 Outlet 4 Valve seat member 5 Valve port 6 Main valve 7 Piston 8 Outlet side space 10 Bulkhead cylinder 11 Communication hole 12 Pilot valve 21 Diaphragm 23 Pressure setting spring 24 Pressure adjusting screw

Claims (1)

It is inlet and valve port and outlet formed in the valve housing, is arranged a main valve opposite the valve port, in which the main valve is so allowed to open and close the piston cooperates with the valve port A partition wall cylinder is provided to separate the outlet side space between the valve port and the piston and the outlet, and a plurality of communication holes having a total opening area equal to the valve port area are formed in the partition wall wall at equal intervals. The pressure reducing valve is characterized in that communication holes are formed only on both sides of the inlet and outlet in the direction perpendicular to the axial direction .

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