GB-4
D
GB
F
NL
I
E
VG with socket
1 = N (–), 2 = LV1
V1
(+)
2
1
3
4
5
7
6
8
Follow the reverse procedure when reassembling.
Tightness test
CAUTION
Please observe the following to ensure that the VG
is not damaged during the tightness test:
–
Check max. inlet pressure – see type label.
–
Test pressure ≤ 1.5 x max. inlet pressure.
▷
The tightness test procedure on VG is function-
ally the same for all nominal sizes. The following
figures apply to all VG variants by way of example.
Close the solenoid valve.
Shut off the gas supply.
To be able to check the tightness, shut off the
downstream pipeline as close as possible to the
valve.
Checking for external tightness
0
N
2
≤ 1
,5 x p
u max.
0
0
N
2
≤
1,5 x p
u max.
4
6
5
Open the solenoid valve.
0
N
2
≤ 1
,5 x p
u max.
0
0
N
2
≤
1,5 x p
u max.
4
6
▷
Pipeline leaking: check the seal.
Checking for internal tightness
7
Close the solenoid valve.
N
2
ca. 6 mbar
0
0
N
2
≤
1,5 x p
u max
0
0
8
10
9
After 60 seconds, increase the text pressure to
≤ 1.5 x p
u max.
.
N
2
ca. 6 mbar
0
0
N
2
≤
1,5 x p
u max
0
0
8
10
▷
Tightness OK: open the pipeline.
▷
Unit leaking: remove the VG and return it to the
manufacturer.
Commissioning
Setting the flow rate
▷
At the factory, the gas solenoid valve is adjusted
for maximum flow rate.
VG 0/5 – 40/
▷
The minimum and maximum flow rates can be
set within half a turn.
VG 40 – 65
▷
The minimum and maximum flow rates can be
set within 20 turns.
+
-
V
V
p
u
Setting the start gas rate
▷
The start gas rate can be set with a maximum
of 3 turns.
VG..L
Start
~1 mm
V
+
+
V
+
V
1
2
3
