Push-type control valve for fluid actuator

Details Push-type control valve for fluid actuator Push-type control valve for fluid actuator

1980-08-08

1982-03-23

Weakley, Harold W.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137458, 137557, 13762566, F15B 1304

Patent

active

043207790

ABSTRACT:
A pilot line-operated control valve (32) for an actuator (14) that operates a gate valve (12) in the main flowline (10). A slide valve (70) having a piston (76) on its inner end is mounted in a longitudinal bore (46) of the elongate valve body (40) for movement between an open position in which fluid is directed to actuator (14), and a closed position in which fluid is prevented from flowing to actuator (14). A fluid isolated pilot blocking portion (98) of slide valve (70) is oriented such that once slide valve (70) moves to the closed position, pilot blocking portion (98) abuts pilot port (56) so as to block pilot line fluid pressure from acting on slide valve (70) under any operating conditions, including even a resumption of fluid pressure in the pilot line (30), when slide valve (70) is in the closed position. The so-called push-type control valve (32) is reset by manually pushing slide valve (70) inwardly.

REFERENCES:
patent: 4196750 (1980-04-01), Peters
patent: 4239058 (1980-12-01), Peters
patent: 4256141 (1981-03-01), Peters

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