VAG Operating and maintenance instructions • 8
Table 2
DN
150
200
250
300
400
450
500
600
700
800
900
1000
1200
1600
1800
2000
PN 10
max. operating torque [Nm]
at input of gear box
20
20
20
20
20
25
25
25
40
50
30
40
30
200
130
190
turns/stroke
20,5
20,5
20,5
20,5
20,5
20,5
26,8
52
52
52
155
155
212
212
424
424
PN 16
max. operating torque [Nm]
at input of gear box
20
20
20
20
25
30
25
30
55
70
40
60
40
230
150
210
turns/stroke
20,5
20,5
20,5
20,5
20,5
20,5
26,8
52
52
52
155
155
212
212
424
424
PN 25
max. operating torque [Nm]
at input of gear box
20
20
20
25
45
50
40
40
70
90
45
90
55
260
175
250
turns/stroke
20,5
20,5
20,5
20,5
20,5
20,5
26,8
52
52
52
155
155
212
212
424
424
PN 40
max. operating torque [Nm]
at input of gear box
20
25
35
35
50
60
45
45
90
120
70
110
75
-
-
-
turns/stroke
20,5
20,5
20,5
20,5
20,5
20,5
26,8
52
52
52
155
155
212
-
-
-
7.1 General safety instructions
Prior to any inspection and maintenance work to be performed
on the valve or mounted parts and attachments, the pressurized
pipeline must be shut off, the pressure must be relieved and the
system must be secured against unintentional switching on. De-
pending on the kind and criticality of the medium or fluid con-
veyed, all the required safety regulations must be complied with!
Upon completion of the maintenance work and prior to resuming
operation, all connections must be checked for proper fastening
and leak-freeness. The individual steps as stated under Section 5
need to be performed.
Please note, a plunger valve is not self-locking. Therefore neither
the drive nor the gear must be dismantled while the valve is pres-
surised. This section also applies when the valve is completely
dismantled.
7.2 Inspection and actuation intervals
The leak-freeness, smooth operation and corrosion protection of
the valve should be checked at least once per year (DVGW Tech-
nical Rules W 392).
Under extreme operating conditions, inspection needs to be done
at shorter intervals.
The body seals can be replaced, if required, depending on the
type of fluid conveyed.
7.3 Maintenance and replacement of parts
The spare parts needed can be found in the spare parts list in
chapter “7.3.1 Design”.
7 Maintenance and servicing
