Load responsive fluid control valves

Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement

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Details

60484, F16H 3946

Patent

active

041765214

ABSTRACT:
A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve. System is powered by a single fixed or variable volume pump. The direction flow control valve is equipped with a load responsive control which automatically regulates pump discharge pressure to maintain either a constant low pressure level or low pressure differential at the motor exhaust. The pump discharge pressure is either regulated by bypassing of excess flow to reservoir, or by a special load responsive control, which varies the pump displacement. Direction control valve may also be equipped with a control responsive to load pressure for controlling negative loads and an inlet pressure throttling control for simultaneous control of multiplicity of loads.

REFERENCES:
patent: 3971216 (1976-07-01), Miller
patent: 4065922 (1978-01-01), Ott et al.

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