Hydraulic control valve assembly having dual directional...

Details Hydraulic control valve assembly having dual directional... Hydraulic control valve assembly having dual directional...

2005-03-29

2005-03-29

Lopez, F. Daniel (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

Reexamination Certificate

active

06871574

ABSTRACT:
A first control valve selectively connects a first port of a double acting actuator to either a pump supply line or a tank return line, and a second control valve selectively connects a second port of the actuator to either a pump supply line or a tank return line. A first pilot operated check valve restricts fluid flow to a direction only from the first control valve to the first workport unless a pilot pressure from the second port is sufficient to open the valve for the opposite flow direction. A second pilot operated check valve restricts fluid flow to a direction only from the first control valve to the second workport unless a pilot pressure from the first port is sufficient to open the valve for the opposite flow direction. A load sense circuit is incorporated to produce signal indicating the greater pressure at the actuator ports.

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patent: 6499505 (2002-12-01), Zenker et al.
patent: 6516706 (2003-02-01), Porter et al.

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