Operating principle of Evac vacuum inteface unit
The Evac vacuum interface valve unit works in a similar way to the Evac vacuum toilet. The activator is triggered when a static head of 80 mm has accumulated in the graywater tank. This then transfers the operating vacuum to the plunger diaphragm, opening the discharge valve for three seconds. When the level of liquid in the tank reaches approx. 80 mm, the cycle is repeated. Flushing can only occur when there is sufficient operating vacuum (over -25kPa). The whole operation is automatic and no electrical connections are required.