Many types of valves, check valves and other valve variants exist.
- Backwater valve
- Ball check valve
- Diaphragm check valve
- Swing check valve
- Tilting disc check valve
- Stop-check valve
- Lift-check valve
- Duckbill valve
- Non slam check valve
- Nozzle check valve
- Axial check valve
- Piston check valve
- Petroleum check valves
- Silent check valve