PARKER CPOM2 A pilot operated check valve works as a standard check valve when flow is travelling from inlet to outlet. A check valve allows flow in one direction and blocks flow in the opposite direction. When the system pressure at the check valve inlet is high enough to overcome the spring force biasing the poppet, the poppet is pushed off its seat. Flow then passes through the valve. PARKER CPOM Series - Pilot Operated Check Valve Parker Manapak Subplate Sandwich Module PARKER CPOM Series - Pilot Operated Check Valve - NFPA D03 (CETOP 3, NG 6) parker cpom2ddv parker cpom 2 parker cpom2ddn50 parker cpom2aav parker cpom2dd parker cpom2ddv56 cpom2bbv parker parker cpom2aav56 parker cpom2aan