9D Backflow Preventer

Backflow preventer 9D is used in tapwater installations with protective covering to fluid category 3. The filling module is a protective device of type CA according to SS-EN 1717. Backflow preventer 9D is designed according to KIWA BRL-K 648 and has dual non-return valves and pressure-controlled intermediate chamber with drainage.

In the standard, the filling module unit is termed a “protective device”. To meet the standard’s function inspection requirement, protective devices must be fitted as a “protective module”, i.e. be supplemented with the following equipment, in the direction of flow: Shut-off valve, Drain for inspection, Dirt filter, Filling module (protective device), Shut-off valve. When installing, the standard’s installation requirements must be followed.

The filling module does not require maintenance. Any checks are carried out according to a regular inspection plan.