Check Valves or Non-return valves (NRV) is basically an automatic valve open to allow forward flow and close to against reverse flow. In principle, it split into four basic types. There are swing, dual-plate, tilting disc and lifting type. Wrong selection of check valve type can leads to operability problem, leakage and continual maintenance issue.

Lift Check Valves
- higher pressure drop is expected.
- equipped with small return spring to facilitate valve closure on reverse flow
- two type of seat. hard seat for for high differential pressure sealing and resilient seat for low differential pressure sealing
- shortest travel length. Fastest response.
- excellent performance for low and/or pulsating flows
- not good for fluid with particles
- Body install horizontal with disc / piston vertically
- Small check valve range from 1/2