Hydraulic control valve for fluid metering and cylinder protecti

Details Hydraulic control valve for fluid metering and cylinder protecti Hydraulic control valve for fluid metering and cylinder protecti

1996-08-26

1998-01-20

Lee, Kevin

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

1374875, 1374895, F16K 3112

Patent

active

057093687

ABSTRACT:
A hydraulic control valve for minimizing fluid leakage from a load actuating cylinder and for protecting the cylinder from damage has a composite valve body with a poppet slidably disposed in a bore and biased to the closed position. A pilot spool, controllable by a proportional solenoid regulates pilot pressure. Regulated pilot pressure allows for accurate control of the poppet for metering fluid from cylinder to tank. A force feedback spring disposed between the poppet and the pilot spool exerts a force on the pilot spool equivalent to the force from the proportional solenoid keeping the forces in equilibrium. Pilot pressure is adjusted to establish the relief pressure setting for the hydraulic control valve while conical sealing surfaces, minimize fluid leakage from cylinder to tank.

REFERENCES:
patent: 5042775 (1991-08-01), Willemsen
patent: 5301920 (1994-04-01), Ichiki
patent: 5350152 (1994-09-01), Hutchison et al.
patent: 5421545 (1995-06-01), Schexnayder

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