Pressure-control valve

Details Pressure-control valve Pressure-control valve

1986-02-04

1988-11-08

Wayner, William E.

Motors: expansible chamber type

Relatively movable working members with one having motive...

137538, F01B 100

Patent

active

047827360

ABSTRACT:
A pressure-control valve is connected to a working cylinder of an hydraulic, walking, mine roof support on one side of the piston in the cylinder. In its function as a pressure-limiting valve, it regulates the pressure in the working cylinder in dependence upon a predetermined pressure in a control conduit which is connected to the pressure chamber of a prop of the mine roof support. Through it a spring-loaded control piston of the pressure-control valve is hydraulically loaded so as to act on a spring-loaded valve closure member in the pressure-control valve. The control piston holds the valve-closure member in the closure position if the pressure in the control conduit exceeds the predetermined pressure. If the pressure in the control conduit drops off, the valve-closure member then regulates the pressure in the working cylinder to a comparatively low value.

REFERENCES:
patent: 4274435 (1981-06-01), Block

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