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Start-up and operation
6.4 Adjusting the set points
Î (see Fig. 3)
The flow rate can be adjusted either when
the electric actuator is mounted on the valve
or without a mounted electric actuator.
6.4.1
Adjustment of the flow
rate
Î Completely open the control and shut-off
valves or the bypass valve in the plant.
To adjust or change the flow rate set point,
proceed as follows:
Always adjust the set point based on a com-
pletely closed restriction.
NOTICE
!
Risk of damage to the restriction stem
through one-side loading (DN 15 to 25)
while turning the adjustment screw clock-
wise.
First turn the handwheel of the electric actua-
tor or using the manual adjuster Ba43
(u T 2176, 1790-8169) to completely close
the restriction.
Tip
For exact adjustment, verify adjusted value
with a heat or flow meter.
32
6.4.2
Adjustment without elec-
tric actuator
For valve sizes DN 15 to 25, adjust the flow
rate by turning the adjustment screw (8.3) at
the side using a 4 mm hex wrench.
For valve sizes DN 32 to 50, use the set
point adjuster (8.2) to adjust the flow rate.
NOTICE
!
For valve sizes DN 15 to 25, use the manual
adjuster Ba43 (u T 2176, 1790-8169) to
close the restriction. Do not use the side ad-
justment screw (8.3) to close the restriction.
After reaching the closed position, fix this
position with the side adjustment screw (8.3)
and remove the manual adjuster Ba43. Ad-
just the flow rate at the adjustment screw
(8.3).
1. Close the restriction by:
− Turning the set point adjuster (8.2) clock-
wise or
− Extending the stem of the electric actua-
tor or
− Using the manual adjuster Ba43.
For valve sizes DN 15 to 25, the regula-
tor is delivered with an open restriction
(8.5).
2. Determine the number of turns of the
screw or adjuster required to achieve the
desired flow set point from the relevant
adjustment diagram.
For valve size DN 15, the adjustment
curve that corresponds with the flow co-
efficient K
indicated on the nameplate
vs
must be selected.
EB 3135-1 EN
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