What are some common types of check valves?

Check valve manufacturer give some common types of check valves:

Swing check valve

A swing check valve has a disc that swings on a hinge to allow flow in one direction and prevent backflow in the opposite direction.

Lift check valve

A lift check valve has a disc that lifts up from the seat to allow flow in one direction and closes to prevent backflow in the opposite direction.

Ball check valve

A ball check valve has a ball that moves up and down within the valve body to allow flow in one direction and prevent backflow in the opposite direction.

Diaphragm check valve

A diaphragm check valve has a flexible diaphragm that moves up and down to allow flow in one direction and prevent backflow in the opposite direction.

Stop-check valve

A stop-check valve is a combination of a globe valve and a lift check valve. It allows flow in one direction, but can be closed to prevent backflow.

Tilting disc check valve

A tilting disc check valve has a disc that tilts on a hinge to allow flow in one direction and prevent backflow in the opposite direction.

Dual plate check valve

A dual plate check valve has two spring-loaded plates that move in opposite directions to allow flow in one direction and prevent backflow in the opposite direction.

The specific type of check valve used will depend on the application and requirements of the system.