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5. Check the strainer (e.g. measure the
pressure drop) and clean it, if necessary.
6 Operation
6.1 Adjusting the set points
The following generally applies: First adjust
the differential pressure set point and the
flow limitation afterwards.
6.1.1
Adjusting the differential
pressure limit
Type 46-6 · Adjust the desired differential
pressure at the set point adjuster (10) or
manual adjuster (19) with the plant almost
shut and with the restriction (1.2) fully open.
First afterwards adjust the limit value for the
flow rate.
Note
Using the set point adjuster (10) or manual
adjuster (19)
− Turn clockwise :
Tension the springs to increase the set point.
− Turn counterclockwise :
Relieve the spring tension to reduce the set
point.
How to proceed:
1. Close the motorized valve.
2. Unscrew the cap (18) and undo the lock
nut (16).
3. Open the restriction (1.2) so that the flow
restriction does not take effect by turning
the set point screw (17) counterclockwise
() as far as it will go.
EB 3130 EN
4. Slightly open the motorized valve (ap-
prox. 10 % valve travel).
5. Adjust the differential pressure by turning
the set point adjuster (10) or manual ad-
juster (19) to load the set point springs
(8).
For regulators in sizes DN 15 to 32 with set
point range from 0.2 to 1 bar, the set point
spring is installed in the bottom section of the
valve body.
1.2
1
0.8
0.6
0.4
0.2
0
2
3
1
Fig. 7: Differential pressure set point adjusted
at the manual adjuster according to the
value on the scale
In this case, the set point can be directly ad-
justed at the manual adjuster (19) according
to the scale.
One turn of the manual adjuster will change
the differential pressure by 0.033 bar.
Operation
Value
on scale
4
5
6
23
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