VAN · Edition 05.22
EN-4
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
0
4
5
0
6
Open the solenoid valve.
7
8
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 2
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.
3
4
5
6
7
8
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.
d
VAx 1, VAN 1 VAx 2–3, VAN 2
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
b
VAx 1–3,
VAN 1–2
c
Slide seal under the second groove.