System separator BA Compact 1/2" with controllable differential pressure
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We provide the harmonised EU notice on the legal guarantee of conformity in advance. Mandatory use applies from 27/09/2026.
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drain valve (3) opens as soon as the pressure difference Δp between the inlet chamber (A) and the middle chamber (B) reaches a value just below the pre-calculated value at the contrast spring (5). The drain continues until the middle chamber of the backflow preventer is empty. In this way, an air gap (safety zone) is created and prevents contaminated water from flowing back from the circuit (C) into the water supply network, even in the event that the check valve (2) fails. As soon as the normal state is restored (inlet pressure higher than outlet pressure), the drain valve closes and the