Pressure compensating hydraulic control system

Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...

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60452, 91446, 91518, F15B 1302

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active

055796427

ABSTRACT:
An improved pressure-compensated hydraulic system for feeding hydraulic fluid to one or more hydraulic actuators. A remotely located, variable displacement pump provides an output pressure equal to input pressure plus a constant margin. A pressure compensation systems requires that a load-dependent pressure be provided to the pump input through a load sense circuit. A reciprocally spooled, multiported isolator transmits the load-dependent pressure to the pump input but prevents fluid in the load sense circuit from leaving the load sense circuit and flowing through a relatively long conduit leading to the remotely located pump. In a multi-valve array, at least one valve section has a backflow-preventing shuttle valve which prevents backflow through the pressure compensation system if a main relief valve is operative.

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patent: 5067389 (1991-11-01), Germain
patent: 5146747 (1992-09-01), Sugiyama et al.
patent: 5161373 (1992-11-01), Morikawa et al.
patent: 5211196 (1993-05-01), Schwelm
patent: 5347811 (1994-09-01), Hasegawa et al.
patent: 5415199 (1995-05-01), Claudinon et al.

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