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Design and principle of operation
3.1 Additional fittings
Î See Fig. 3-3
Pressure gauges
Install a pressure gauge (3 and 5) at suitable
points to monitor the pressures prevailing in
the plant.
Installation in the bypass of a centrifugal pump
6
5
–
P
2
8
7
1 Shut-off valve
2 Strainer
3 Pressure gauge (flow pipe)
Fig. 3-3: Installation example: Type 42-20 and Type 42-25. The control lines to be installed on site
are represented by a dashed line.
3-4
Centrifugal pump
4
3
2
+
P
1
8
Differential pressure
4
regulator
Pressure gauge (return flow
5
pipe)
Bypass and shut-off valves
We recommend installing a shut-off valve (1
and 6) both upstream of the strainer and
downstream of the regulator and installing a
bypass line. The bypass ensures that the
plant does not need to be shut down for ser-
vice and repair work on the regulator.
Installation in the short-circuit pipe of a house substation
1
1
8
7
2
3
4
+
–
P
P
1
6 Shut-off valve
7 Needle valve (optional)
Compensation chamber
8
(optional)
5
2
6
EB 3007 EN
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