Membrane check valve ECO 3T series

for waterthreadedbackflow

The threaded end backflow ECO 3T preventers, with controllable reduced pressure zone type BA EN1717 are approved in conformity with EN12729 and are manufactured in accordance with the most severe product norms and in conformity with the quality requirements of EN ISO 9001. The body of dimension DN 15 is made of brass and the body of dimensions DN 20-50 is made of bronze. They consist of 2 spring check valves and a chamber situated in between the spring check valves, which contain a security valve, which in the event of “backflow”, isolates the primary network from the user network. The backflow might be caused by siphoning (the entry pressure decreases due to ruptures in the piping upstream, the water supply is interrupted, draining off parts of the piping due to events upstream) or the build up of counter pressure (the pressure of the user network is higher than the pressure in the primary network due to overpressure caused, for example, by incoming water pumped from a private water well). Backflow preventers are indispensable to prevent contamination of the distribution network of the drinking water from connect user units (for example, washing machines, boilers, industrial plants, hospitals, laboratories, fire fighting plants). Backflow preventers BA type assure protection, in case of backflow, against the risk of pollution for types of water up to category 4, according reference standard EN1717. They are not suitable for water of category 5 (fluid presenting a human health hazard due to the presence of microbiological or viral elements); in this case an air gap separation must be used.