Function; Installation - BWT D1 Einbau- Und Bedienungsanleitung

EN

3. Function

The D1 is a spring-loaded pressure reducer. The force of a setpoint-spring
counteracts a membrane force. If the initial pressure drops due to a water con-
sumption, the membrane force also decreases and the now greater spring force
opens the valve. On the outlet side, the pressure is increased again until a equi-
librium state between membrane force and spring force is reached.

4. Installation

The pressure reducer, which is factory-set to 3 bar of back pressure (for SP
version), must be installed in the pipeline without stress. Make sure that the
correct seals are fitted and only suitable tools are used!
It is advisable to maintain to a calming section of 5 x DN and to install shut-
off valves on the admission and back-pressure sides. Also observe other local
stan-dards and regulations.
The direction of flow must match the arrow on the housing.
The installation position is arbitrary.
The pipeline must be carefully flushed through before the pressure reducer is
installed, This ensures that the impurities being carried along by the medium
cannot impair the fault-free function.
The pressure gauge, optionally arranged on the back pressure side, enables
the set back pressure to be checked and is screwed to the threads provided
by means of sealing tape.
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Attention!!!
Before the pressure reducer is commissioned, it must be ensured that the
two pressure gauge connections on the housing are sealed by means of pres-
sure gauges or sealing plugs.
The required back pressure is set by turning the adjustment knob at quie-
scent pressure (zero consumption) (Fig. a).
There are 2 ways to do this:
1) Setting using an adjusting scale
The setting can be made without operating pressure! The adjusting scale,
visible on both side, indicates the required setting pressure.
Loosen the fixing screw on the adjustment knob for a 1/4 turn (do not remo-
ve!) by turning to the left. Turning the adjustment knob clockwise increases
the back pressure and turning anticlockwise reduces the back pressure. If
necessary, check the pressure using a pressure gauge. Now re-tighten the
fixing screw.
2) Setting using a pressure gauge
The setting can be made only with operating pressure!
Shut off the water supply and relieve the valve on the outlet side, e.g. by
drawing off water, and make sure no further draw off is made. Loosen the
fixing screw on the adjustment knob for a 1/4 turn (do not remove!) by turn-
ing to the left.
EN
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