Lift Check Valve - High Pressure Lift Check Valve (NRV) The VCS 31 Check Valve incorporates the state of art technology in a simple and easy to operatemaintain design which is ideal for at pump outlet or where a reversal flow is not desired. Most common application for this valve would be on the outlet side of a pump. FM Non Return valves are reliable for reverse flow prevention in Oil and Gas, Refinery, Power Sectors and protecting equipment & processes in general industries.