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Operation
2.4
Shut-off valves, pressure
gauges
Ideally, install hand-operated shut-off valves
both upstream of the strainer and down-
stream of the differential pressure regulator.
This allows the plant to be shut down for
cleaning and maintenance routines, or when
the plant is not operated for long periods of
time.
To monitor the pressures prevailing in the
plant, install pressure gauges both upstream
and downstream of the regulator and in the
flow and return flow pipes at the pressure
tapping points.
3
Operation
3.1
Start-up
Fill the plant very slowly on start-up.
Note! When carrying out a pressure test on
the section of the plant equipped with the
pressure regulator, make sure the dia-
phragm actuator cannot be damaged by the
test pressure (max. differential pressure Δ p).
3.2
Set point adjustment
On Types 45-2 and 45-4, adjust the re-
quired differential pressure by tensioning the
spring(s) at the set point adjuster (9):
4
Turn the set point adjuster clockwise to
increase the differential pressure.
4
Turn the set point adjuster counterclock-
wise to reduce the differential pressure.
6
EB 3124 EN
On valve sizes DN 15 to 32 with set point
ranges from 0.1 to 0.5 and 0.1 to 1 bar,
the set point springs are installed in the bot-
tom section of the valve body. In this case,
the set point can be directly adjusted accord-
ing to the scale at the manual adjuster (19).
One turn of the set point adjuster will cause
a differential pressure change of 0.033 bar
for a pressure range of 0.1 to 1 bar and
0.02 bar for a range of 0.1 to 0.5 bar.
Note!
Do not adjust the set point to a scale value
smaller than "1"!
Under certain conditions, the set point can-
not be adjusted anymore as a result.
In this case, the following steps are recom-
mended:
– Relieve the process pressure from both
sides of the regulator.
– Turn the adjuster counterclockwise as far
as it will go to its lowest position.
– Turn the adjuster back clockwise at least
past the scale value "1" to "2".
– The regulator can now be readjusted.
Δp
1.2
1.0
0.8
0.6
0.4
0.2
0
1
2
3
Fig. 2 · Set point adjustment according to scale value
0.1-1
bar
0.1-0.5
bar
4
6
5
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