Who invented the Stop Silent SL13 backflow preventer?
Lasso Technik AG is a pioneer in backflow diaphragms for pressure media up to 16 bar. This expertise formed the basis for the development of a backflow diaphragm for media with solids content in the low pressure range.
The SL13 backflow flap was developed in 2013 by Mr. Daniel Rohrer and brought to market maturity in close cooperation with the Lucerne University of Applied Sciences and Arts in Switzerland.
The SL13 is manufactured, assembled, tested and marketed in Switzerland.
Easy to clean: Easy to remove and reinstall for cleaning
Durable: The first backflow flap installed has been exposed to a backflow every 20 minutes for 2013 years and still works perfectly today."
What is the life expectancy of the SL13?
Our membranes generally exceed a service life of 25 years in the water supply sector.
We have had in-depth knowledge of the wastewater sector since 2013. Our reference system at the sewer network operator of the city of Bern has been subject to a backflow every 20 minutes since 2013.
Materials?
Membrane: EPDM rubber, is resistant to domestic waste water
The backflow level is where the water emerges from the sewer system. This is the maximum water column that presses over the house connection towards the cellar.
The backwater calculator shows how quickly how much water can get into the cellar. The water pushing back can reach 60 liters or more per second
What needs to be protected?
Cellar rooms that can be flooded.
The installations, furniture and electrical installations as well as the lives of people and animals.
Assembly situation
The SL13 can be easily retrofitted in various situations.
It can be installed to protect against sand and debris being washed into a pipe end or to prevent small animals and insects from entering.
Into an accessible pipe, whereby a piece of at least the length of the SL13 is cut out. The SL13 can be installed in this piece of pipe. The whole thing is then reassembled with 2 pipe couplings.
Installation
Clean the entire situation and remove incrustations
Measuring
What mounting aids are available?
It is important to consult the checklist before purchase and installation.
We recommend using a cardboard wedge to measure the inside diameter of the pipe.
You can find the installation video here
A photo of the pipe clarifies the situation and shows incrustations, pipe reductions and pipe bends, which must be taken into account before installation.
In which pipes can SL13 be installed?
Basically in all types of material such as plastic, concrete, ceramic or steel.
The inside diameter of the pipe must correspond to the clamping range of the SL13. Adapters can be manufactured outside this range. For example, we manufacture an adapter for the SL13 DN125 for an internal pipe diameter of 140 mm.
Plastic pipes are often deformed, so measure horizontally and vertically
A photo in the pipe clarifies many things, reduction, pipe bends, incrustations...
Measure the inside diameter of the pipe with a cardboard wedge, see...
The gradient for domestic wastewater is greater than 2% according to the standard and therefore sufficient for the SL13. However, if there is any uncertainty, this should be checked. This depends on the accessibility and should be carried out by an expert company with a sewer camera or a surveying device. If this is not possible, the inspection interval after reinstallation should be kept short.
Slide in SL13 and clamp. (mounted in a few minutes)
Function check, observe opening and closing of the diaphragm.
Install in the outlet or inlet of an inspection chamber?
The decisive factor is the amount of rainwater that can flow into the shaft during an incident. If a lot of rainwater is expected, the SL13 should be installed in the inlet from the basement.
If little or no inflow of rainwater is to be expected, SL13 can be braced in the outlet of the inspection chamber. In this situation, the inspection chamber and the pipes serve as a reservoir for water during a backflow.
Clean the situation, do not use high pressure or cleaning spirals
Function check by observing the opening and closing of the diaphragm
In the event of malfunctions: Dismantling, cleaning and checking for damage
Costs
The cost of backflow damage depends on the use of the cellar. Insurance can help.
The costs of backflow protection depend on the size
The overall project costs are relatively low, and no or hardly any structural modifications are necessary. There is no need to lay power lines.
The pure installation costs are negligible.
Maintenance does not require specialist training. A visual function check is necessary and can be carried out by the homeowner.
Some insurance companies contribute financially to the installation of backflow protection, as this brings them more benefits than costs in the long term. For further information, please contact Lasso Technik AG."