Counterbalance valve with a relief function

Details Counterbalance valve with a relief function Counterbalance valve with a relief function

1991-01-25

1991-12-31

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91436, 91447, F15B 1304

Patent

active

050761439

ABSTRACT:
A counterbalance valve with a relief function, disposed in a pair of supply and exhaust lines communicating a directional control valve with a fluid actuator for adjusting a flow area at an exhaust side of the supply and exhaust lines in response to a pressure at a supply side of the supply and exhaust lines, which includes two divided spools, corresponding to the supply and exhaust lines, respectively, as a spool of the counterbalance valve, a device for moving one of the divided spools at the supply side of the supply and exhaust lines in such a direction that the flow area increases in response to an increased pressure at the exhaust side of the supply and exhaust lines, when the pressure increases beyond a predetermined pressure due to a pumping function of the fluid actuator, and a communicating passage for communicating the exhaust side of the supply and exhaust lines with a supply side of the supply and exhaust lines when the moving device is actuated so that the fluid at the increased pressure at the exhaust side of the supply and exhaust lines is relieved to the supply side of the supply and exhaust lines.

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