What are lift check valves?

Lift check valves work automatically with line pressure in a horizontal position only as the bonnet is positioned vertically above the valve.

Like a globe valve, with its indirect line of flow, lift check valves are flow-restricting, and so are generally used as a companion to globe valves. Line pressure lifts the disc, and flow is allowed to occur. When flow reverses, the disc falls back onto its seat and immediately cuts off the flow, preventing back-flow from occurring.