SL13 Backwater valves

Our backflow protection offers maximum protection for your building - whether for rainwater or wastewater containing faecal matter (faecal water)

Automatic opening:
A natural pressure is exerted on the membrane of the backflow preventer by a build-up of water until the pipe is approximately full, which then opens upwards and allows the water to drain away.

Secure closure:
When the water flow stops, the sealing lip closes again and closes the valve. The valve is always closed in its basic position.

Maximum protection against backflow:
If a backflow occurs from the sewer, the rubber membrane fills due to the back pressure and is pressed firmly against the pipe wall. This effectively prevents water from entering the building.

Additional benefit - Stops unpleasant sewer gases/radon:
A major advantage of this design is the odor barrier. As the membrane closes tightly when not in use, gas movement from the sewer system is made impossible. This directly helps to prevent harmful or foul-smelling sewer gases or radon from escaping into the cellar or living spaces.