CO2 Check Valve

[fencer]

The reason for the difference in the lift value is because most lift check applications involve pumps. Sometimes pumps need some large backpressure to operate efficently. In passive applications a 1 or 2 psi lift is it. The most important point in check valves is how well it seats back to prevent backflow. Tony i suspect yours spring loaded poppet and the cheaper ones are a flappper type.