Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1990-01-10
1992-02-18
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60477, 60480, 60494, 91461, 91443, F16D 3102
Patent
active
050882830
ABSTRACT:
A proportional directional control valve in combination with a pressure compensator flow rate control valve opening towards a reservoir and a pressure unloading valve in the load- pressure- carrying control line for the compensator valve are provided to actuate the telescopic cylinder of a tipper truck. The valve device is connected to a pump of constant displacement. The operating speed of the telescopic cylinder is independent from the load to be lifted and the driving speed of the pump. Upon reaching a predetermined load pressure the pressure unloading valve is activated and the load pressure engaging the compensator valve towards closing direction is reduced via the reservoir such that the compensator valve opens and the pump displacement volume returns to the reservoir.
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Look Edward K.
Mannesmann Rexroth GmbH
Mattingly Todd
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