Gas-hydraulic pressure type actuator for pipeline valve

Details Gas-hydraulic pressure type actuator for pipeline valve Gas-hydraulic pressure type actuator for pipeline valve

1976-12-06

1978-10-17

Schwadron, Martin P.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 26, 92 9, F16K 31143, F16K 3112, F15B 1522

Patent

active

041204786

ABSTRACT:
An actuator 4 for a valve 2 disposed in a gas pipe line 1 is driven directly by the gas pressure in the pipe line, which is tapped off and supplied to the appropriate end of the actuator cylinder via an electromagnetic spool valve 12 or 25. A hydraulic transfer circuit couples the chambers on the piston rod sides of the actuator cylinder, and includes flow control valves 17, 18 for regulating the actuator speed and an oil expansion tank. The latter may be sealed and a positive pressure established therein to facilitate the oil transfer. A hand pump 22 may also be provided to implement the oil transfer and drive the actuator piston from the piston rod side if the gas pressure is too low to power the actuator.

REFERENCES:
patent: 887517 (1908-05-01), Raub
patent: 2838140 (1958-06-01), Rasmussen et al.
patent: 3100965 (1963-08-01), Blackburn
patent: 3151533 (1964-10-01), Hartel
patent: 3687013 (1972-08-01), Haller

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