Hydraulic pilot operated check valves enable directional control by locking fluid flow until a pilot pressure signal releases the check function for reverse flow. Key sub-types include Parker sandwich plate check valves from the CPOM and ZRE series and in-line pilot check valves such as the RH series. Configurations cover CETOP stackable designs and threaded in-line body styles with pilot piston actuation and various port sizes. These valves support load holding and controlled retraction in fluid power systems, supplied as genuine Parker Hannifin products with technical support and fast delivery.