Lasso Technik AG

Since
1942

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.

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.

SL13 - Low pressure up to 0.5 bar

Our Stop Silent backflow flap SL13 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, which also includes backwater protection. In many older buildings, undetected risks lurk that can lead to potential basement flooding.

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.

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.

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

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

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 screw connections and consists of a cone with a small flange made of A4 stainless steel.

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.

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 these dampers, which are specially designed for pipes and ducts, in connection with the building services in 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 function do the non-return valve & backflow flap actually perform?

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 backflow, the flap is ideal, 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. Once the backwater level is exceeded, apartments in the basement or cellar are at risk of flooding. 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 backflow 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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