Auxiliary closing force for valves

Details Auxiliary closing force for valves Auxiliary closing force for valves

1975-08-14

1977-08-23

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Fluid link or column actuator

60547, 251 30, F16K 31122

Patent

active

040435334

ABSTRACT:
A valve having a valve stem in the form of an actuating rod connected with a hydraulic piston in an hydraulic cylinder and an air piston in an air cylinder and which is closed by a spring has a system for assisting the spring in closing the valve and in maintaining it closed. As the actuating rod travels during the closing operation, a pressure differential across the air piston is exerted and thereafter the pressure differential across the hydraulic piston is exerted to assist the spring in closing the valve and to maintain it in a closed position.

REFERENCES:
patent: 1918424 (1933-07-01), Pontow et al.
patent: 3114297 (1963-12-01), Gizeski
patent: 3182971 (1965-05-01), Wakeman et al.
patent: 3531078 (1970-09-01), Hose et al.

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