Automatic control for variable displacement pump.

摘要

A control for a variable displacement pump (10) in which a displacement control element (30) is made responsive to a load sensing valve (34) and a pilot pressure relief valve (32). A control fluid is supplied to the pressure relief valve (32) and the load sensing valve (34) and the control pressure fluid controls the working pressure fluid which operates the stroking piston (14) for the pump (10).