1942
Two check valves celebrate anniversary
The story of the anniversary of the two valves
The Stop Silent product
To solve these challenges, Albert Schüle developed the Stop Silent plug check valve. The way it works is simple and ingenious: an elastomeric cone deforms during fluid flow and returns to its original position when stopped, similar to the movement of a jellyfish which can be seen in the company's logo. This created a second mainstay in sanitary engineering alongside the ropeway business. In 1963, Lasso Technik AG received an order to install several Stop Silent multi-cone valves in the Lucerne waterworks in Switzerland.
From the lake into the Lucerne water network
Installed 60 years ago and almost forgotten
The Stop Silent valves were dismantled and replaced with new stainless steel cones with silicone membranes in accordance with drinking water recommendations. Today, all membranes and cones have been replaced and are up to date and already in use for the next 60 years
The Stop Silent light backflow valve revolutionises the wastewater market
The conventional commercial backflow preventers served as inspiration for the development of the Stop Silent Light, a combination of diaphragm backflow prevention and expander clamp. It is the world's only valve that can be force-fitted into a pipeline. In collaboration with the Lucerne University of Applied Sciences and Arts, Lasso Technik AG therefore began to develop a product for backflow protection.
The civil engineering office of the city of Bern/Switzerland became aware of the "Stop Silent Light" backwater flap in 2013 and turned to Lasso Technik AG with their problem at the Felsenau river power station. The problem was that storm debris was being washed onto the forecourt of the power plant, resulting in an unsightly accumulation of wastewater residue.
After extensive consultation, the first backwater flap was installed at the Felsenau power plant a short time later.
The Bern Felsenau river power plant
As reliable as Swiss clockwork
Lasso Technik AG sets the standard for the years to come - your valve specialist since 1942.
Fittings for every application
| Lorem | Lipsum | Lorem |
|---|---|---|
| > | low maintenance |
| > | fail-safe |
| > | durable, up to 50 years |
| Lorem | Lipsum | Lorem |
It silently deformes to let liquides pass in one direction and withstands strong pressure in the opposite direction.
The Stop Silent Product Line
The Stop Silent Light
backwater valve
- Easy and quick to install without structural adjustments
- Always closed and active against backwater
- No mechanical moving parts and no electronics for a longer lifetime
- Also serves as flat check valve (against frogs) and anti-odour valve
The Stop Silent
non-return valve
- Consists of two components only (membrane and support cone)
- No moving mechanical parts, no electronics
- Gentle closing, no water hammer
- Low pressure drop
- Low maintenance
- Long-lasting
Backwater valves with innovative Stop-Silent® technology: always in the flow
Are you a property owner and want to know what the proven Stop-Silent® technology is all about? And how the Stop Silent Light® backwater valve can prove useful to you in wastewater applications?
As specialists in innovative backwater valves, we will explain to you what Stop-Silent® and Stop-Silent Light® technology are all about. You need the flaps, which are specially designed for pipes and lines, in connection with the building services of your property. We are the exclusive supplier of this innovative technology.
We offer you the Stop Silent® check valve for clean water pipes and the Stop Silent Light® backwater valve for wastewater applications.
Here you can also learn about the advantages of the Stop Silent® and Stop Silent Light® technology from Lasso Technik AG.
What is the specific function of the non-return valve & the backwater flap?
The Stop-Silent® check valve ensures that the water in pipes and lines can always flow in one direction without being given the opportunity to reverse. This applies in particular to drinking water pipes, but also to service water pipes - e.g. for heating water. Valves are also used in conjunction with valves and pumps to determine the direction of flow. The flaps are always closed, except when the liquid flows in the right direction they open. In this way, pumps can be prevented from causing backflow of water.
The Stop-Silent Light® backwater valve is used in dirty water pipes. Designed for backwater, the flap proves its worth, for example, when the sewer system is in danger of flooding. If too much water - due to heavy rain, for example - enters the sewer system, a surge of water occurs. Once the backwater level is exceeded, apartments in the basement or the cellar are at risk of flooding. This can result in costly removal of a fecal water damage.
Where is the backwater valve installed?
It is installed in the control manhole and the installation can be done easily within a few minutes. In addition, there is no need for any modifications. A great advantage of the backwater flaps is that they can be used without electricity and are always active, i.e. autonomous. The backwater flap clamps itself uncomplicatedly into the wastewater pipe. Therefore, no structural measures or special precautions are necessary for the installation. Thanks to our easy-to-understand installation instructions, the backwater flaps can be installed and retrofitted by yourself even without expert knowledge.
What is special about Stop-Silent Light® technology?
Backwater valves equipped with this innovative technology have membranes. As soon as the liquid hits the flap, it deforms slightly, allowing the liquid to flow through. If strong pressure is applied to the flap in the other direction of flow, it closes completely and offers very high resistance. Thus, the flap provides a reliable and precise seal. In this way, flooding can be prevented.
How often should the backwater flap & check valve be serviced?
The manufacturer recommends maintenance once a year for the flap if it is used for rainwater. If you use the flap in connection with sewage (e.g. with regard to fecal matter), maintenance is recommended twice a year. Here, first of all, a check is carried out to ensure that the valve is in good working order.
In addition, the operability of the valve is to be checked and whether the pipe behind it can perform its service properly. If cleaning is necessary, it is essential to do it very gently and never with high pressure. For example, you can simply take the valve out of the pipe, clean it by hand, and put it back in the pipe without any complications.
Lasso technology - quality from the experts
With the backwater flaps and the check 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 backwater flaps and check valves of Lasso Technik AG are characterized by a long service life and are a long-term investment at low cost.
Decide now for quality!