Lockout valve

Details Lockout valve Lockout valve

1985-09-03

1986-11-25

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

91420, 91447, 137522, F15B 1301, F15B 1304

Patent

active

046244450

ABSTRACT:
The invention is a lockout valve used in a hydraulic circuit to prevent leakage in a static condition; the lockout valve does not require outside force to hold the lockout open once flow across the lockout is established due to the positioning of an orifice ring around the poppet upstream of the poppet seat with the closing area acting on the poppet in conjunction with a spring which senses the pressure downstream of the orifice ring so that when there is sufficient flow across the orifice ring, the force created by the opening area on the poppet, which is located upstream of the orifice ring, will exceed the combined force of the spring and the closing area so that the lockout valve will remain open without an outside force so long as sufficient flow is maintained across the poppet.

REFERENCES:
patent: 3247867 (1966-04-01), Martin
patent: 3613508 (1971-10-01), Krehbiel
patent: 4545287 (1985-10-01), Jackson

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