Motor seal protector valve

Details Motor seal protector valve Motor seal protector valve

1985-11-18

1987-12-22

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60459, 91421, 91426, F15B 13042, F16K 2104

Patent

active

047139366

ABSTRACT:
A hydraulic motor has its lube drain connected to the motor return line. A motor seal protector valve has a pilot which responds to pressure in the motor return line. Normally, the valve connects system pressure to the motor inlet. High pressure in the return line causes the pilot to move the valve to block the motor feed line and then to connect the motor feed line to sump. In a preferred embodiment, system pressure is connected to the plot to "lock up" the valve in response to return line overpressurization.

REFERENCES:
patent: 3125324 (1964-03-01), Vivier
patent: 3411416 (1968-11-01), Herd et al.
patent: 3470792 (1969-10-01), Darling
patent: 3735590 (1973-05-01), Bobst
patent: 3771422 (1973-11-01), Kamman
patent: 3774726 (1973-11-01), Bredberg
patent: 3915068 (1975-10-01), Gassman
patent: 3942413 (1976-03-01), Scwary et al.
patent: 4040439 (1977-08-01), Uppal
patent: 4041841 (1977-08-01), Haskew
patent: 4114516 (1978-09-01), Johnson
patent: 4218957 (1980-08-01), Underwood

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