Since
1942

Flap valves

for use in sewer pipes

Flap valves from the manufacturer for use in sewer pipes to protect against the ingress of vermin and small animals from sewer systems

Flap valves made by Lasso Technik

Animals such as vermin or frogs that enter drain pipes can become a problem for water quality. With our Stop Silent Light flap valve, the penetration of small animals into your sewage system is reliably and permanently eliminated. The simple installation in the industrial as well as in the private waste water sector is quickly installed inside the pipe. Furthermore, this frog flap is a reliable backwater protection for waste water with a backpressure of up to 0.5 bar. The flap valve prevents an unpleasant stench which the waste water produces. Here the waste water pipe is sealed airtight.

Advantages of the Stop Silent Light flap valve

Simple and quick installation
High longevity
Airtight odour damper
Reliable backwater protection in the event of flooding
Suitable for faecal and rainwater

Is your piping system protected against the infiltration of small animals?

Small animals entering tube systems can quickly become an annoying problem. To solve it reliably and permanently, a Stop Silent Light check valve can be fixed in the tube.

Because of this problem, it is also the quality of the water that is deteriorating, which can have unpleasant consequences for humans.
With the “frog flap” function, it is impossible for small animals to infiltrate the piping systems, which guarantees a perfect water condition.

The Stop Silent Light system fits into the tube and is barely visible after installation.

A simple operation that ensures continuous performance.

Due to an accumulation of water up to pipe filling, a pressure is exerted on the membrane, which then opens upwards. When the flow is stopped, the sealing lip closes and the valve closes.

Case study of Bivio, Graubünden

After the new intake was commissioned to supply Bivio, it was noted that amphibians and other vermin could infiltrate the piping from the outside.

In order to solve this problem as quickly as possible, our Stop Silent Light backstop protection systems has been installed.

The installation is characterized by quick fixing and friction clamping inside the tube. Within minutes, the valves were installed and ready for use.

Functionality of our flap valves

Our anti-frog shutters also serve as protection against water backflow. The accumulation of waste water exerts pressure on the membrane so that the sealing lip opens upwards. In doing so, the valve releases the waste water flow. If the flow stops, the sealing lip folds down again and closes the nose flap. In order to prevent sewage gases from escaping from the cellars, the valve is always airtight.