Valve, especially proportional pressure control valve

Details Valve, especially proportional pressure control valve Valve, especially proportional pressure control valve

2006-01-25

2010-11-30

Fristoe, Jr., John K (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S625640, C137S493000, C251S030040

Reexamination Certificate

active

07841360

ABSTRACT:
A proportional pressure control valve includes a valve housing (38) with at least three fluid connections (1, 2, 3). The valve can be connected to a hydraulic drive system with a pre-determinable consumer pressure. The valve can perform reliable valve switching functions even for low-viscous fluid media, and can reduce its susceptibility to disturbance variables. A valve piston (56) actively connected to a pilot seat (5) by an energy accumulator (62) can be controlled by a control device (40). The consumer pressure on a fluid connection (1) acts on the valve piston (56) such that, according to the consumer pressure and the actuating force of the control device (40), a fluid can flow between the two other fluid connections (2and3) in both directions inside the valve housing (38).

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