Butterfly valve (non-return valve)

Flap check valve for stopping water in the groundwater well.

The flap check valve prevents water from flowing back into the drainage pipe during flooding. The flap valve allows for a lower well solution and is suitable for locations where the height difference must be smaller. The flap check valve requires only a 1 cm height difference between the inlet and outlet to operate.

The flap valve can also be used as a protection at the end of a rainwater discharge pipe.