ARI Armaturen STOBU PN63-160 EN - Manual (Page 16)

Page 2-16 Rev. 0040102002 0213
Operating and installation instructions
STOBU
®
PN63-160
Valve with throttling plug +
position indicator + lock-
ing device cannot be
opened. Locking device has been tightened. Release locking device.
Rattling / banging
of the plug design with
„loose plug“ Nominal diameter of the valve in com-
pliance to the flow rate is to big Choose smaller nominal diameter
Use a plug damper execution: see
medium
- high flow turbulences;
- the valve with loose plug is mounted
directly by a centrifuged pump;
- behind pressure reduction stations;
- behind pipe elbows;
- in compact plants;
- expansion joints are missing;
- the pump is not mounted on a
damper;
- there is no flow stabilizing pipe length;
- there is no start-up bypass line
Alter the system
Use a plug damper execution: see
medium
Flange broken between
valve and piping. Bolts tightened unevenly.
Mating flanges not properly aligned. Re-align piping and fit new valve!
Fault Possible cause Corrective measures