Self-reversing hydraulic control system and self-reversing pump incorporating such system

摘要

A self-reversing hydraulic control system for use with a device to be driven in opposite directional modes, especially a self- reversing pump driven by such a device. The system depends upon a flow sensing element disposed to sense flow associated with movement of the driven device and adapted to generate a stop signal responsive to the termination of such flow. A means responsive to the stop signal is then effective to shift the system from one directional mode to the other. Also featured is a sensor disposed to receive and transmit hydraulic fluid under pressure to drive the device, stoppage of the flow adapted to cause the sensor to shift position and to transmit pressurized hydraulic fluid pressure, as the stop signal via a hydraulic line. In preferred embodiments the self- reversing hydraulic control system has a two- position 4-way valve which is shifted in position by the hydraulic stop signal. Embodiments utilizing a single sensor and a pair of sensors are shown, in combination with special arrangements of check valves. A preferred construction of the sensor is also shown.