VENTILEINRICHTUNG ZUR STEUERUNG DER DRUCKMITTELWEGE EINES HYDRAULISCHEN SERVOMOTORS

摘要

A control valve for use with a hydraulic system in which a variable displacement pump is controlled by the pressure drop from the inlet port to the work port of the control valve includes an improved logic system. This logic system provides flow reversible fluid communication between a control port and either of two work ports in the control valve when either work port is connected to the inlet port; and it provides an attenuation path from the control port to an exhaust port when neither work port is connected to the inlet port.