The valve is used to maintain a set pressure in part of a hydraulic circuit to counterbalance a weight or other external force.
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Normal used in conjunction with a 3 position directional control valve, the counterbalance valve allows free flow in one direction but pr3events return flow until pilot pressure is admitted. The external force this sustained until the pilot pressure moves the spring loaded valve spool and allows metered flow back to the tank. A second function provides a shock absorbing overload relief. Excellent metering characteristics are provides by the tapering spool and, when seated, leakage does not exceed 10cc/min at 315 bar.