Valve assembly for load independent control of multiple hydrauli

Details Valve assembly for load independent control of multiple hydrauli Valve assembly for load independent control of multiple hydrauli

1992-10-30

1994-05-31

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60494, 91517, 91532, F16D 3102

Patent

active

053158288

ABSTRACT:
The present invention relates to a valve assembly for the supply of users in hydraulic control systems with pressurized fluid for the load pressure (LS) independent control of several simultaneously actuated hydraulic users wherein the ratio of the partial flows once set is maintained at undersupply of the system with the pressurized fluid. When the demand of the users exceeds the maximum output flow of the variable displacement pump, the (high) priority users receive the demanded quantity whereas the low priority users receive a reduced quantity by switching the control pressure for the low (i.e. no) priority users via a directional control valve and a pressure relief valve to a lower pressure level. Only when undersupply of the entire system occurs, i.e. when the maximum output flow of the variable displacement pump is no more sufficient despite the limitation of the control pressure for the low priority users, then the presently flowing partial flows of all users are reduced proportionally.

REFERENCES:
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patent: 4343151 (1982-08-01), Lorimor
patent: 4635439 (1987-01-01), Wible
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patent: 4738103 (1988-04-01), Tha
patent: 4966066 (1990-10-01), Kauss et al.
patent: 5127226 (1992-07-01), Suzuki et al.
patent: 5182909 (1993-02-01), Stellwagen

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