Diaphragm anti-siphon valve
A diaphragm anti- siphon valve (MAV) is a valve that prevents a tank from leaking through a siphon effect in the event of a pipe leak. Due to the number of systems, the risk of being lifted out mainly affects heating oil storage systems; In principle, there is also a risk with all stored liquids.
There is a risk if the pipeline is lower than the maximum level of the storage tank. Depending on the height difference and the medium density, the pressure of the medium in the lower lying pipeline is higher than the ambient pressure on the liquid in the tank. In the event of an undetected leak, the tank would leak up to the level of the leakage point.
The diaphragm anti-siphon valve has an adjustable spring that presses on a valve cone. The closing force is set so that the force is sufficient to close the valve safely at the maximum possible height difference between the tank level and the pipeline. The anti-siphon valve is only opened when the heating oil pump of the connected consumer device (e.g. burner ) starts up and creates a negative pressure. The membrane anti-siphon valve is installed as close as possible to the tank at the highest point of the line. The legislator prescribes the installation of an anti-siphon protection due to the protection of water bodies , if the potential danger exists.
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- ↑ Information sheet Ingenieurbüro Scherer ( Memento of the original from January 8, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 217 kB)
