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How to proceed:
1. Unscrew the cap (18).
2. Undo lock nut (16) and turn the set point
screw (17) clockwise as far as it will go
to close the restriction.
3. Adjust the flow rate according to the val-
ue determined (number of turns in coun-
terclockwise direction ).
4. Secure restriction setting using the lock
nut (16) at the set point screw (17).
Screw cap (18) back on.
5. Lead-seal the set point setting at set point
screw (17) and cap (18).
For special versions with a scaled cap, the
limit value can be adjusted directly. One
scale division corresponds to one turn of the
set point screw (17).
NOTICE
!
To determine the flow limitation to be ad-
justed and for Type 46-6 additionally the dif-
ferential pressure required, the differential
pressure across the restriction (Δp
must be added to the known pressure drop
of the plant (Δp
plant
differential pressure at the restriction is as-
sumed to be 0.2 bar.
The curves of the flow ranges in the follow-
ing diagrams (Fig. 9, Fig. 10 and Fig. 11)
apply to 0.2 and 0.4 bar.
EB 3130 EN
restriction
). From experience, the
6.1.4
How to proceed:
1. Unscrew the cap (18).
2. Undo lock nut (16) and turn the set point
screw (17) clockwise to close the re-
striction.
3. Completely open the motorized valve.
4. Open the restriction initially one turn at a
time. Check the flow rate at the heat me-
ter (reading of flow measuring unit). Ad-
just the flow rate in smaller steps until the
required flow rate is constant ( 2 % devi-
ations are generally acceptable).
If the maximum flow rate is not reached,
the differential pressure set point (in
Type 46-6) must be increased.
5. After reaching the required flow rate, se-
cure the restriction setting using the lock
nut (16). Screw cap (18) back on.
6. Lead-seal the set point setting at set point
)
screw (17) and cap (18).
Based on an unknown
plant pressure drop
Operation
25
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