Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1985-10-01
1987-08-11
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
91421, F16D 3102
Patent
active
046852956
ABSTRACT:
The invention relates to a control unit for a hydraulically operated consumer of the type which is used for operating heavily intermittently and loaded machines such as cranes. The consumer is fed in accordance with a load sensing function with pressurized fluid which depends on the opening of the supply valve but is independent of load pressure variations. The invention is directed to minimizing the lagging of the adjustments to different loading conditions to provide more rapid stabilization. This is done by providing the signal conduit with three branches between the inlet and outlet lines to form a pressure dividing arrangement in which the signal pressure is no longer equal to the load pressure but is composed of parts of the load pressure and the output of a pressure regulating valve in the inlet line of the unit. Upon fluctuation in the load the amount of flow is not kept constant but instead decreases with an increasing load and increases with a drop in the load. This has a damping effect on the system so that a stable condition is rapidly reached.
REFERENCES:
patent: 3994133 (1976-11-01), Pfeil et al.
patent: 4011721 (1977-03-01), Yip
patent: 4118149 (1978-10-01), Hagberg
patent: 4285195 (1981-08-01), Budzich
Christiansen Preben
Eskildsen Christian
Thomsen Svend E.
Danfoss A/S
Easton Wayne B.
Look Edward K.
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