Evac Vacuum interface units
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Evac Vacuum interface units

Vacuum interface units

Vacuum interface units are used when gravity based appliances, such as wash basins, sinks and urinals, are connected to a vacuum sewage system. Vacuum interface valves are available in 2 and 5 litre versions. The tank of the 2 litre unit (upper pictu

Technical features

Vacuum interface valves (VIVs) are used to connect gravity-based appliances to a vacuum sewage system. Whilst the Evac vacuum toilet is an integral part of the system, the system will also accept waste from all other gravity fixtures, including hand basins, baths, urinals, sumps, and showers. It does this using vacuum interface valves. The VIVs allow standard bathroom fittings to be connected to the vacuum drainage system in new-build projects, while eliminating the need to replace existing fittings in refurbishment projects.

The tank of the 2 litre unit is made of polypropylene, and the tank of the 5 litre unit  is made of corrosion resistant AISI 316. Both of the vacuum interface valves make use of the proven Evac pneumatic flush mechanism with flush memory and vacuum sensor technology. No electricity is needed.

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.

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