Motors: expansible chamber type – With motive fluid valve – Plural separately controlled waste passages for single...
Patent
1976-07-01
1978-10-10
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Plural separately controlled waste passages for single...
91461, 60468, 60494, 137389, 137399, 137413, 4172115, 417299, 417309, F15B 1108, F15B 13042
Patent
active
041190165
ABSTRACT:
A hydraulic control device for use in a hydraulic system having a pump supplying fluid from a reservoir to a working circuit. The control device detects leaks in the working circuit by monitoring the level of hydraulic fluid in the reservoir. In the event of a drop in the level of hydraulic fluid beyond a predetermined low level, the control device automatically diverts the fluid output side of the pump to the fluid input side to prevent further loss of fluid in the working circuit and to safeguard against cavitation in the pump due to the low level of fluid in the reservoir. The control device also senses excessive pressure peaks in the working circuit and operates to relieve the excessive pressure peaks by automatically venting a portion of the fluid on the output side of the pump to the reservoir.
REFERENCES:
patent: 701548 (1902-06-01), Day
patent: 993628 (1911-05-01), Williams
patent: 2317091 (1943-04-01), Adams
patent: 3292500 (1966-12-01), Risk
patent: 3335746 (1967-08-01), Lebow
patent: 3723025 (1973-03-01), Caokley
Breidenbach Hans
Pfeil Christian
AuBuchon F. David
Cohen Irwin C.
International Harvester Company
Krubel Frederick J.
Parks Raymond E.
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