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5 tIGHtness test
1 Close the gas solenoid valve.
2 To be able to check the tightness, shut off the
downstream pipeline close to the valve.
3
5
6 Open the solenoid valve.
7
9 Tightness OK: open the pipeline.
➔ Pipeline leaking: replace the seal on the flange, see
accessories. Then check for tightness once again.
➔ Unit leaking: remove the unit and return it to the
manufacturer.
6 RePLACInG tHe ACtUAtoR
➔ The actuator adapter set for the new actuator must
be ordered separately.
VAN 1
VAx 1, VCx 1: Order No. 74924468,
VAx 2–3, VCx 2–3: Order No. 74924469.
➔ The seals of the actuator adapter set are covered
with a non-stick coating. No additional grease is
required.
1 Disconnect the system from the electrical power
supply.
2 Shut off the gas supply.
➔ Remove the M20 cable gland or other type of
connection.
0
4
0
8
VAN 2
3
6
9
➔ Depending on the construction stage of the unit, there
are two different methods for replacing the actuator:
If the unit concerned has no O-ring in this place
(arrow), replace the actuator as described here.
Otherwise, go to the next note.
a
b Insert seals.
c Position of the metal ring can be selected.
VAx 1, VAN 1 VAx 2–3, VAN 2
d
e Slide seal under the second groove.
f
➔ If the unit concerned has an O-ring in this place
(arrow), replace the actuator as described here:
VAN 1: use all seals from the actuator adapter set.
VAN 2: use the small seal from the actuator adapter
set and only one of the large seals.
a
c Slide seal under the second groove.
EN-4
4
5
7
8
VAx 1–3,
VAN 1–2
b
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