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Backflow preventers SL13
Low pressure up to 0.5 bar
Stop Silent® backflow flap type SL13 DN80 - DN1200 The versatile solution for heavy rainfall, flooding, as a frog flap and against odor and noise emissions. Installed in just a few minutes without any structural modifications. Retrofitting is also possible for non-circular or oval pipes. The Stop Silent SL13 can be installed at both the inlet and outlet. Also suitable for irregularly used properties such as vacation homes.
Backflow preventers SL13
Low pressure up to 0.5 bar
A Swiss invention - The Stop Silent® SL13 was specially developed in Switzerland for use in faecal water and brought to market maturity in collaboration with the Lucerne University of Applied Sciences and Arts. It is assembled directly on site in Basel. Thanks to high-quality materials, the SL13 guarantees chemical and mechanical resistance as well as a long service life. Orders are delivered to the recipient within 48 hours of being placed.
Backflow preventers SL13
Low pressure up to 0.5 bar
Our Stop Silent® SL13 backflow flap should always be installed when backflows are to be expected. Such a backflow occurs when the municipality's sewer system is overloaded by heavy rainfall and its capacity is exceeded. The loss of furniture, emotionally valuable items, the foul smell and the pollution cause both visible damage and invisible psychological stress. Such stress factors can be avoided with a well thought-out flood protection concept that also includes backwater protection. In many older buildings, undetected risks lurk that can lead to potential basement flooding.
Backflow preventers SL13
Low pressure up to 0.5 bar
Stop Silent® SL 13 as a frog flap - Our flap is also used in water reservoirs in Switzerland - as an amphibian flap and insect barrier. This means that fewer additives are needed in the drinking water and both the drinking water structures and the animals are reliably protected.
Backflow preventers SL13
Low pressure up to 0.5 bar
No additional foundation or base is required for the run-out into nature. Our system can be installed in just a few minutes without any additional effort, tools or machinery. The Stop Silent® SL13 backflow flap prevents backflow and flooding from watercourses and ponds without impairing the flow of water. Its simple installation and maintenance-friendly design offer long-lasting protection with minimal effort.
Check valves AS
High pressure up to 16 bar
Stop Silent® check valve type AS - Noise-reducing, optimum flow values and minimum pressure loss for gaseous, liquid & viscous media - Diaphragm qualities: silicone, EPDM, NBR, fluorosilicone, Elastosil ,Viton. - Temperature range: from -10°C to 210°C - Since 1942
Check valves AS54
High pressure up to 16 bar
Stop Silent® AS54, DN 40 to DN 200 - This non-return valve consists of a cone with an enlarged flange made of A4 stainless steel. An AS54 can be installed in a system without any structural changes, even retrospectively, and is a cost-effective and quick solution. Available with or without nameplate flag
Check valves AS41
High pressure up to 16 bar
Stop Silent® AS41, DN 25 to DN 200 - The AS 41 non-return valve is usually installed in standard fittings and consists of a cone with a small flange made of A4 stainless steel.
Check valves ASSF
High pressure up to 16 bar
Stop Silent® ASSF flanged valve, DN 40 to DN 200 - From a diameter of 40 to 200 mm, our loose flanged valves with control sleeve are manufactured as a welded construction. The components in contact with the medium are made of A4 stainless steel; we also offer higher material qualities on request.
Check valves ASMK
High pressure up to 16 bar
Stop Silent® ASMK multi-plug valve, DN 150 to DN 2200 - In the multi-plug valve welded construction, several larger and smaller plug diaphragms are arranged on a center plate and housed in a body. The number and size of the individual cones is adapted precisely to the flow requirement. These valves have very good flow values and a very low pressure loss. The water hammer is reduced to an insignificant level. The entire component is made of stainless steel A4 or higher. Multi-plug valves can be designed according to your specifications.
Our Stop Silent® Non-return valves
have the movement efficiency of a jellyfish.
Lasso Technik AG
Your contact for the Swiss market


Niklaus von Flüe-Str. 33 4059 Basel Switzerland
+41 61 3314090
+41 61 331 42 76


Stop Silent® Europe GmbH
Subsidiary of Lasso Technik AG
Your contact for the European market

Lindenbergstrasse 5 79199 Kirchzarten Germany
+49 (0) 7661 9689 643
+49 (0) 7661 7980


Backflow flaps with innovative Stop-Silent® technology: always in flow

Are you a property owner and would like to know what the proven Stop Silent® technology is all about? And how the Stop Silent® SL13 backwater valve can prove useful for you in wastewater applications?

As a specialist in innovative backwater valves, we will explain to you what Stop-Silent® and Stop-Silent® SL13 technology is all about. You need the dampers specially designed for pipes and ducts in connection with the building services of your property. This innovative technology is available exclusively from us.
We offer you the Stop Silent® non-return valve for clean water pipes and the Stop Silent® SL13 non-return valve for wastewater applications.
Here you can also find out about the advantages of Stop Silent® and Stop Silent® SL13 technology from Lasso Technik AG.

What is the specific function of the non-return valve and the backflow flap?

The Stop-Silent® non-return valve ensures that the water in pipes and lines can always flow in one direction without being able to reverse. This applies in particular to drinking water pipes, but also to service water pipes - e.g. for heating water. The valves are also used in conjunction with fittings or pumps to determine the direction of flow. The flaps are always closed unless they open when the liquid is flowing in the right direction. In this way, it is possible to prevent water backflow in pumps.
The Stop-Silent® SL13 backflow flap is used in wastewater pipes. Designed for backwater, the flap has proven its worth, for example, when the sewer system threatens to flood. If too much water enters the sewer system - e.g. due to heavy rain - the water level rises. As soon as the backwater level is exceeded, there is a risk of flooding apartments in the basement or cellar. This can result in the costly removal of faecal water damage.

Where is the backflow flap installed?

It is installed in the inspection chamber and can be easily installed in just a few minutes. Furthermore, no conversions are required. A major advantage of the backwater flaps is that they can be used without electricity and are always active, i.e. autonomous. The backwater flap simply clamps into the wastewater pipe. This means that no structural measures or special precautions are required for installation. Thanks to our easy-to-understand installation instructions, the backwater flaps can be installed and retrofitted by yourself, even without specialist knowledge.

What is special about the Stop-Silent® SL13 technology?

Backflow flaps equipped with this innovative technology have membranes. As soon as the liquid hits the flap, it deforms slightly so that the liquid can flow through. If strong pressure is exerted on the flap in the other direction of flow, it closes completely and offers very high resistance. The flap thus ensures a reliable and precise seal. This prevents flooding.

How often should the backwater flap & non-return valve be maintained?

The manufacturer recommends servicing the flap once a year if it is used for rainwater. If you use the flap in conjunction with wastewater (e.g. faeces), maintenance is recommended twice a year. The first step is to check that it is working properly.
In addition, the functionality of the valve should be checked and whether the pipe behind it is working properly. If cleaning is necessary, it is important to carry it out very gently and never under high pressure. For example, you can simply remove the valve from the pipe, clean it by hand and simply reinsert it into the pipe.

Lasso technology - quality from the experts

With the backwater flaps and non-return valves from Lasso Technik AG, you are relying on a company that has been producing reliable and established solutions in the field of flow and building technology since 1942.
The backflow flaps and non-return valves from Lasso Technik AG are characterized by a long service life and are a long-term investment at low cost.

Choose quality now!
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Lasso Technik AG
Niklaus von Flüe-Strasse 33
4059 Basel
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+41 61 331 40 90
lasso@lasso.ch
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