Hydraulic positioner for valves

Details Hydraulic positioner for valves Hydraulic positioner for valves

1976-12-27

1978-08-01

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251 94, 251 25, 92130B, 92130D, F16K 31122

Patent

active

041038649

ABSTRACT:
A positioner having a differential piston which is hydraulically locked by the oil pressure of a tripout valve and which in turn cocks a closing and an opening spring against each other, in which, after the tripout oil pressure falls, the closing spring is first released, pulling the piston up, thereby permitting the opening spring to open the valve suddenly.

REFERENCES:
patent: 1995561 (1935-03-01), Belanger et al.
patent: 2315816 (1943-04-01), Rodgers
patent: 3051433 (1962-08-01), Dale et al.
patent: 3523675 (1970-08-01), Grove et al.

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