Cartridge Valve Cover
Function W33 - Pilot shuttle (ports X and B) with mounting face for size 03 pilot valve
The shuttle function in combination with a solenoid operated pilot valve is available in cartridge sizes 16 through 63. In each cartridge size, the pilot valve is the DG4V-3 that mounts to the ISO 4401, size 03 (ANSI/B93.7M-D03) interface. There are two functional cover types, W13 and W33, that are applied with a model DG4V-3 pilot valve. The insert used can be either the model D15 (1:1.5 area ratio poppet), or model D20 (1:2 area ratio poppet).
The function of the W33 cover, is to provide a non-reverse flow check, thereby eliminating the need for a separate back flow check. Flow is either blocked or allowed from port B to port A. Flow from port A to port B is always blocked. The application would have pump flow going into port B, port A connected to the actuator and control port X connected to port A.