Sequence Valve with Reverse Flow Check (1PSC100): It is usual in a double-acting system for the flow to have to pass past the sequence valve in reverse direction. It is possible to mount a free-flow check valve around the cartridge but it is also possible to include this extra valve in the design. This cartridge includes the free-flow check, making giving a more compact solution. 1PSC SERIES SEQUENCE VALVE WITH REVERSE FLOW - PILOT OPERATED