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4.3 Ball valve with gravity break
The backflow preventers (RV) in the system are indicated separately. They are integrated in the ball valves. They are marked
with "RV" on the rotating handle. The RV can be opened manually by turning the rotating handle by approx. 45° to the "end
position".
Note:
Shut-off valves must always remain open and be secured against unintentional closure. They must only be activated by
qualified specialist personnel! The ball valves must be fully open in order for the system to operate.
Shut-off fittings
The shut-off fittings are fitted with integrated, manually adjustable backflow preventers. Pay careful attention to the direc-
tion of flow, otherwise the backflow preventer may work against the intended direction of flow and thus block the flow.
Ball valve settings and operating states
Pos. 1) Setting 0°;
Ball valve open;
Pos. 2) Setting 45°;
Ball valve open;
Pos. 3) Setting 90°;
Ball valve closed
Note:
Pos. 2 may be used for flushing, bleeding and draining purposes. Grip elements can be dismounted and should be aligned
according to the operating state (Pos. 1 - 3). Observe the direction of flow in the supply (VL) and return line (RL). Thermom-
eter colour: Return line: blue/red, Supply line: red
Backflow preventer active
Backflow preventer inactive
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