Hydraulic dry valve control apparatus

Details Hydraulic dry valve control apparatus Hydraulic dry valve control apparatus

1989-12-18

1994-11-15

Look, Edward K.

Power plants

Pressure fluid source and motor

60459, 417295, 251326, F16D 3100

Patent

active

053636490

ABSTRACT:
A hydraulic pressure system includes a pump and a dry valve situated in the inlet of the pump, the dry valve being actuated by a pilot valve capable of capturing the pressure differentials between inlet and outlet of the pump for shifting the dry valve between opened and closed positions. In the dry operational mode, the pump inlet operates at a pressure below atmospheric, thus providing a pressure differential substantial enough to move the dry valve to an opened position. In the preferred form, the pilot valve is a solenoid actuated two-position, four-way, spring loaded valve. The dry valve is a gate valve directly coupled to a fluid control motor.

REFERENCES:
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patent: 3463193 (1969-08-01), Yost
patent: 3935917 (1976-02-01), Eley et al.
patent: 3961862 (1976-06-01), Edstrom et al.
patent: 4052135 (1977-10-01), Shoop et al.
patent: 4345881 (1982-08-01), Peterson et al.
patent: 4383546 (1983-05-01), Walters, Jr.
patent: 4471942 (1984-09-01), Kocasowski
patent: 4731999 (1988-03-01), Niemiec
patent: 4741675 (1988-05-01), Bowden
patent: 4746276 (1988-05-01), McBurnett et al.
patent: 4818189 (1989-04-01), Nakajima

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