Piston slide construction type hydraulic control valve for controlling differential cylinder, has lifting chamber connected to tank such that fluid quantity that is displaced from chamber is restorable into tank, during return stroke of rod

摘要

The valve has a tank connector (T) connected with a tank (17), and a valve housing (21) comprising an external connector (A2). A reversing valve is provided for recovery of fluid in a large lifting chamber (13) of a working cylinder (10), where the fluid is guided to a connector (B) of the valve. The external connector is connected with the large lifting chamber via an outer lead line (22), where the large lifting chamber is connected to the tank such that fluid quantity that is displaced from the lifting chamber is restorable into the tank, during return stroke of a piston rod (12).