The modular pilot operated check valve MPW, MPA, MPB will allow free flow in one direction and block flow in the opposite direction. It functions to positively hold the actuator in a neutral position. Movement is restored by an automatic pilot pressure signal when the directional control valve shifts to move the actuator. It may be specified to operate on the A, B, or A and B port. Stackable Pilot check Valve, which is used is places where space is a constraint. It helps reduce unnecessary tubing and connections in a hydraulic system.