Pressurized oil supply/discharge circuit and valve device for us

Details Pressurized oil supply/discharge circuit and valve device for us Pressurized oil supply/discharge circuit and valve device for us

1991-06-12

1992-07-07

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91451, 1374933, 1374936, 1374939, 137599, 1375992, F15B 1302

Patent

active

051273136

ABSTRACT:
A check valve (14) with a valve opening actuator function and a bypass opening/closing valve (17) are disposed in parallel in a pressure oil supply/discharge passage (3) connected in communication with a hydraulic actuation chamber (2). The opening/closing valve (17) is adapted to be held at a valve opened position (Y) against a residual pressure holding spring (19) when the pressure on the check valve inlet (14a) side is normal and to be changed over to a valve closed condition (X) by means of the spring (19) when the pressure has lowered to a predetermined value. The pressure oil supply/discharge passage (3) and a pressure discharge passage (7) are connected in communication with each other through a pressure compensation valve (12). The opening/closing valve (17) is composed of a piston valve member (38) resiliently biased against a bypass valve seat (40) by means of the spring (19).

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