Actuator

Details Actuator Actuator

1976-11-03

1978-12-12

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251214, 251282, F16K 31122

Patent

active

041292839

ABSTRACT:
A gate valve operator having dual pistons, one having pilot pressure acting thereagainst thereby tending to open the valve, and one having line pressure acting thereagainst tending to close the valve. The line pressure piston's pressure surface area may be varied to compensate for wells having depleted pressure, and line pressure at all times tends to close the valve, i.e., the actuator is unbalanced.

REFERENCES:
patent: 2897836 (1959-08-01), Peters et al.
patent: 2931616 (1960-04-01), White et al.
patent: 3095176 (1963-06-01), Hunt
patent: 3331583 (1967-07-01), Baker
patent: 3379405 (1968-04-01), Natho
patent: 3385561 (1968-05-01), Whalen
patent: 3410518 (1968-11-01), Carsten
patent: 3770247 (1973-11-01), Nelson
patent: 4016716 (1977-04-01), Evans et al.

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