Holding check control valve

Fluid handling – Systems – Supply and exhaust

Patent

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Details

251282, 251 28, 251 44, 91445, F15B 1304

Patent

active

055402585

ABSTRACT:
A holding check control valve including a main valve, an assistant valve, a check valve installed in an actuator fluid passage provided at the main valve and provided with a spring chamber, the check valve being adapted to be switched between an opened state for opening the actuator fluid passage and a closed state for closing the actuator fluid passage in response to a pressure difference between the actuator fluid passage and the spring chamber so that the return oil in the actuator fluid passage is returned via a return fluid line provided at the main valve at the opened state, a pair of spaced seat members fixedly disposed in the assistant valve, a hydraulic chamber defined between the seat members, the hydraulic chamber communicating with the spring chamber of the check valve, a plunger extending through the seat members, the plunger being slidable along the seat members between a position closing the hydraulic chamber and a position opening the hydraulic chamber, a pressure setting spring for exerting its resilience on one end of the plunger and thereby always urging the plunger toward the closing position thereof, and a piston for pushing the other end of the plunger and thereby moving the plunger to the opening position thereof against the resilience of the pressure setting spring so that oil in the spring chamber is discharged via the opened hydraulic chamber.

REFERENCES:
patent: 4154262 (1979-05-01), Blume et al.
patent: 4172582 (1979-10-01), Bobnar
patent: 4220178 (1980-09-01), Jackson
patent: 4244275 (1981-01-01), Smilges
patent: 4688600 (1987-08-01), Kreth et al.
patent: 5022434 (1991-06-01), Tsukimoto

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