Load sensing system with increasing priority in series of contro

Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Condition responsive means for modifying working member...

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91518, 91532, 60422, F15B 1100, F15B 1300

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active

049660667

ABSTRACT:
A hydraulic system is provided for powering a steering unit, a trailer brake and an auxiliary power unit from a single pump. A control circuit ensures that the hydraulic trailer brake and/or the power steering unit on the vehicle will operate on a preferential basis over the auxiliary power unit. The hydraulic control circuit has two priority valves connected in series. The upstream priority valve has a priority position in which it makes the pump fluid available to a supply line for the common priority flow for the steering and braking apparatus and a non-priority position for powering the auxiliary power unit. The common priority flow is passed through the second or downstream priority valve for priority powering of the power steering circuit.

REFERENCES:
patent: 4057073 (1977-11-01), Adams
patent: 4337620 (1982-07-01), Johnson
patent: 4345436 (1982-08-01), Johnson
patent: 4418710 (1983-12-01), Johnson
patent: 4663936 (1987-05-01), Morgan
patent: 4665695 (1987-05-01), Rau et al.
patent: 4773216 (1988-09-01), Ohashi et al.

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