Backwater valves for retrofitting in flood protection
Stop Silent® SL13 - a multifunctional system in one
- a backflow flap
- a frog flap & amphibian flap
- an odor barrier
- a noise-reducing flap
Drainage pipes from railroad lines
Keeping the subgrade dry is crucial for the long-term stability of railroad lines, and effective drainage plays a key role in this. Drainage systems prevent the accumulation of harmful water in the substructure and subsoil, which ensures the load-bearing capacity and stability of the track at all times of the year. Inadequate drainage can lead to the formation of sludge, which impairs the load-bearing capacity of the substructure, causes deformation of the track bed and contaminates the track ballast.
This is where the Stop Silent® SL13 backwater flap comes into play: it prevents water from flowing back and entering the railroad drainage system in the event of heavy rain or flooding. Thanks to its reliable backflow protection, the system remains dry and functional, which in turn supports the stability and safety of the track. The Stop Silent® SL13 ensures that the drainage systems work optimally even in extreme weather conditions and that the track is protected from water accumulation.
This is where the Stop Silent® SL13 backwater flap comes into play: it prevents water from flowing back and entering the railroad drainage system in the event of heavy rain or flooding. Thanks to its reliable backflow protection, the system remains dry and functional, which in turn supports the stability and safety of the track. The Stop Silent® SL13 ensures that the drainage systems work optimally even in extreme weather conditions and that the track is protected from water accumulation.
Drainage of traffic areas, highways and roads
Functioning and efficient drainage of traffic routes is essential both to protect the infrastructure and to minimize environmental pollution. In rainy weather, roads with heavy traffic can release large quantities of pollutants into the groundwater or surface water.
Drainage pipes play a central role here by systematically draining the wastewater.
If the sewer system is overloaded during heavy rainfall, the water can be forced back into the road surface via the drainage pipes. This returning water softens the subsoil, which jeopardizes the stability of the road surface. Softened road substructures lose their load-bearing capacity, which leads to deformations, cracks and other damage. This can not only affect the safety of road users, but can also result in expensive repairs. In addition to structural damage, the dirt particles from the sewage can settle in the road bed and pollute the surrounding soil.
This is where the Stop Silent® SL13 backflow flap comes in: It effectively prevents water or wastewater from being forced into the drainage system in the event of backwater. This not only protects the substructure of the roadway from softening, but also protects the environment from potential pollution. The use of Stop Silent® SL13 helps to ensure the long-term stability and safety of traffic routes, even under extreme weather conditions.
Drainage pipes play a central role here by systematically draining the wastewater.
If the sewer system is overloaded during heavy rainfall, the water can be forced back into the road surface via the drainage pipes. This returning water softens the subsoil, which jeopardizes the stability of the road surface. Softened road substructures lose their load-bearing capacity, which leads to deformations, cracks and other damage. This can not only affect the safety of road users, but can also result in expensive repairs. In addition to structural damage, the dirt particles from the sewage can settle in the road bed and pollute the surrounding soil.
This is where the Stop Silent® SL13 backflow flap comes in: It effectively prevents water or wastewater from being forced into the drainage system in the event of backwater. This not only protects the substructure of the roadway from softening, but also protects the environment from potential pollution. The use of Stop Silent® SL13 helps to ensure the long-term stability and safety of traffic routes, even under extreme weather conditions.
Danger from heavy rain: How you can protect yourself now
During intense thunderstorms and heavy rainfall, water can quickly accumulate on sealed surfaces such as streets and yards. These weather extremes, in which amounts of rain fall within a short period of time that would otherwise be spread over weeks or months, pose a growing threat to homeowners. Municipal sewer systems are often overwhelmed and unable to drain the excess water. As a result, flooding can occur in which sewer water reaches the so-called
backwater level - i.e. the level of the road surface.
Rooms located below this backwater level are particularly at risk. Without appropriate backflow protection, such as the Stop Silent® SL13, these areas can easily be flooded. Our reliable and durable solution offers you the protection you need to prevent backwater events and avoid flooding in low-lying areas.
backwater level - i.e. the level of the road surface.
Rooms located below this backwater level are particularly at risk. Without appropriate backflow protection, such as the Stop Silent® SL13, these areas can easily be flooded. Our reliable and durable solution offers you the protection you need to prevent backwater events and avoid flooding in low-lying areas.
Did you already know?
Architects, planners, plumbers, construction companies, private individuals and municipalities worldwide rely on the Stop Silent® SL13 backflow flap to protect their buildings and wastewater pipes.
How high is the probability of heavy rainfall in your region?
Use this hazard map to see how badly your region could be affected by heavy rain. With just one click, you can obtain a simulation of the risk of heavy rain in Switzerland and check the risks to your property.
This means you are well prepared for possible extreme weather events and can take measures to protect your property in good time.
This means you are well prepared for possible extreme weather events and can take measures to protect your property in good time.
Case study: Backwater from the stream, Schwerin Germany
The village stream regularly rises very high during heavy rainfall and overflows its banks. Therefore, to protect the neighboring road and houses, a dam was built with a wall that exceeds the level of the road. However, as the street water is channelled into the stream, the water from the stream was forced back through these pipes onto the street and into the cellars of the houses.
The village stream regularly overflows its banks during heavy rainfall and rises dangerously. To protect the adjacent road and the surrounding houses, a dam was built with a wall that rises above the level of the road. However, a problem arose: as the water is diverted from the road into the stream, during floods the water would back up through these pipes onto the road and into the houses.
To prevent such incidents in future, Stop Silent® SL13 backflow flaps were installed at all outlets. This reliable and durable solution now ensures that there is no further flooding due to such backflows.
The village stream regularly overflows its banks during heavy rainfall and rises dangerously. To protect the adjacent road and the surrounding houses, a dam was built with a wall that rises above the level of the road. However, a problem arose: as the water is diverted from the road into the stream, during floods the water would back up through these pipes onto the road and into the houses.
To prevent such incidents in future, Stop Silent® SL13 backflow flaps were installed at all outlets. This reliable and durable solution now ensures that there is no further flooding due to such backflows.
Functionality of our backwater valves
The membrane of the Stop Silent® SL13 backflow preventer is closed as standard after installation. The backflow flap is force-fitted in the pipe using the expander clamp.
As soon as wastewater from the toilet, bathroom or other sources hits the closed membrane, pressure builds up, opening the sealing lip upwards and allowing the wastewater to drain away unhindered. As soon as the water flow stops, the sealing lip automatically closes again and closes the backflow flap.
In the event of a backflow from the sewer system, the sealing lip of the rubber membrane is pressed downwards against the pipe wall, closing the pipe in a force-fit manner. This effectively prevents backed-up sewage from entering lower-lying rooms such as cellars.
As soon as wastewater from the toilet, bathroom or other sources hits the closed membrane, pressure builds up, opening the sealing lip upwards and allowing the wastewater to drain away unhindered. As soon as the water flow stops, the sealing lip automatically closes again and closes the backflow flap.
In the event of a backflow from the sewer system, the sealing lip of the rubber membrane is pressed downwards against the pipe wall, closing the pipe in a force-fit manner. This effectively prevents backed-up sewage from entering lower-lying rooms such as cellars.
Stop Silent® SL13 - a multifunctional system in one
- a backflow flap
- a frog flap & amphibian flap
- an odor barrier
- a noise-reducing flap
Installation sizes of the backflow flaps / odor traps
Our Stop Silent® SL13 backflow flap is available in the following sizes.
Pipe inside diameter:
Pipe inside diameter:
- 80 mm
- 100 mm
- 110 mm
- 125 mm
- 150 mm
- 200 mm
- 250 mm
- 300 mm
- up to DN2400 there is a suitable solution - just ask us
Application examples of our backwater valves
Our Stop Silent® SL13 series backflow flaps offer a wide range of applications to protect buildings, installations and systems from backwater and flooding.
Our Stop Silent® SL13 backflow flaps are used in a wide range of industries, from private households to large industrial and public infrastructures.
- Inspection chambers
- Sewer systems
- Sewer pipes
- Drainage systems
- Flood protection
- Rainwater systems
- Commercial and industrial wastewater systems
- Pumping stations
- Small sewage treatment plants
- Hotels and public buildings
- Airports, railroad stations and ports
- Coastal areas
Our Stop Silent® SL13 backflow flaps are used in a wide range of industries, from private households to large industrial and public infrastructures.
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Daniel Rohrer
CEO - Lasso Technik AG
CEO - Lasso Technik AG