Spring Biased Shuttle Valves

Lee Spring Biased Shuttle Valves can be used to reduce the flow required to extend a large unequal area actuator, where reduced actuation force may be permissible in one direction. When the retract line is pressurized the valve shuttles across to isolate the retract line from the extend line. When the extend line is pressurized the valve blocks the retract line allowing flow from the smaller area retract side of the piston to flow to the extend side. Only a small "make-up" flow is required from the main hydraulic system.

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