Filling and exhaust valve for the control of the hydraulic flow on presses and shears

摘要

An improved filling and discharge valve for use with a hydraulic cylinder is provided, the valve comprising a valve body having a first chamber therein supporting a spring-biased main valve piston having an extending portion containing a chamber in which a second spring-biased valve is supported, the valves operationally being interdependent and being capable of being coupled to a hydraulic cylinder so as to control the flow of oil from oil-storage means to said hydraulic cylinder and back to said oil-storage means according to a pre-determined working cycle. Control valves and switches are provided to control the operation of the filling and discharge valve.