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6.1.2
Differential pressure
control
1. Close the shut-off valves or the bypass to
reduce the maximum flow rate to ap-
prox. 5 to 10 %.
If you are using a motorized valve, close
it to approx. 10 % of its travel.
2. Adjust the required differential pressure
at the set point adjuster (10).
DN 15 and 25
C
Δp
D
6.1 First operating diaphragm
6.2 First actuator stem
8
Set point spring
10 Set point adjuster for differential pressure
C
Diaphragm chamber
D
Diaphragm chamber
Fig. 9: Differential pressure control
EB 3131-1 EN
Turn clockwise () to load the set point
spring (8). The Δp set point increases.
Turn counterclockwise () to relieve the
tension from the set point spring (8). The
Δp set point is reduced.
The set point spring is installed in the bottom
section of the housing in DN 15 and 25. The
set point spring is located externally in the
DN 40 version (see Fig. 9). The set point can
be continuously adjusted using the set point
6.1
6.2
8
10
Operation
DN 40
8
10
25
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