ABSTRACT
The counterbalance valve of Figure 10.16 provides a convenient method of releasing the captive fluid in the event of a machine or power failure and the need to release a load. Check poppet "B" normally allows a free flow of oil from the directional valve (2) to the cylinder or motor (1). Spring "D" exerts a relatively low closing force for the check poppet. The check poppet can be opened to release the load gradually by turning the adjusting screw clockwise. Turning the adjusting screw counterclockwise increases the load holding pressure by compressing spring "E." Pilot flow at (3) is effective against the shoulder area of sleeve "C." Pilot pressure moves sleeve "C" until the stem of check piston "B" abuts the
Figure 10J3 Counterbalance-type valve with return check and maximum pressure relief function.
