Flow control valve having pressure compensating valve

Details Flow control valve having pressure compensating valve Flow control valve having pressure compensating valve

2006-01-31

2010-02-23

Nguyen, John Q (Department: 3654)

Elevator, industrial lift truck, or stationary lift for vehicle

Industrial lift truck or required component thereof

Having specific drive-means for load support

C091S444000, C091S446000, C091S448000, C187S275000, C137S490000, C137S491000, C137S493500, C137S493600

Reexamination Certificate

active

07665579

ABSTRACT:
A flow control valve includes a pressure compensating valve and a first switching valve. The pressure compensating valve is configured to enlarge an opening area of a variable orifice between a load pressure line and a compensating pressure line when a pressure of working fluid of the compensating pressure line is smaller than a first set pressure, and narrow the opening area of the variable orifice when the pressure of the working fluid of the compensating pressure line is larger than the first set pressure. The first switching valve is configured to switch between a meter-out operation and a neutral operation by an external operation, wherein the working fluid of the compensating pressure line is drained in the meter-out operation, the working fluid of the compensating pressure line is not drained in the neutral operation. The load pressure line guides the working fluid to be supplied to an actuator.

REFERENCES:
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patent: 8-143294 (1996-06-01), None
patent: 2007162848 (2007-06-01), None
patent: 2008030896 (2008-02-01), None

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