ARI Armaturen WA 206R EN - Manual (Page 12)

Page 12 Rev. 0040319001 4709
Operating and installation instructions
3-way/str.thr. control valves - WA206/216/306/316
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 troubleshooting table”, the supplier or manufacturer should be consulted.
9.0 Troubleshooting Table
-
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.
ATTENTION !
- read item 10.0 and 11.0 prior to dismantling and repair work!
- read item 6.0 before restarting the plant !
Fault Possible cause Corrective measures
No flow Valve closed Open valve (using actuator)
Flange covers not removed Remove flange covers
Little flow Valve not sufficiently open Open valve (using actuator)
Dirt sieve clogged Clean / replace sieve
Piping system clogged Check piping system
Kvs value of valve unsuitable Fit valve with higher Kvs value
Valve stem moves in jerks. Valve plug slightly seized owing to solid
dirt particles
Clean internals, smooth rough spots
Valve stem or plug cannot
be moved. Seatring and plug clogged with dirt Clean seatring and plug with suitable
solvent
Valve plug seized in seatring or guide
owing to deposits or dirt in medium Replace plug and seatring
With straight trough version, the O-ring
in the seat ring groove was not
removed Remove O-ring; refer to item 7.3.3
Valve stem leaking. Stem seal leaking Replace stem seal;
refer to item 7.1
Leakage too high when
valve is closed. Sealing surfaces of plug eroded or
worn Replace plug; refer to item 7.3.2.
Sealing edge of seatring damages or
worn Replace seatring; refer to item 7.3.2
Seatring and/or plug dirty. Clean internals of valve
Actuator not powerful enough Install more powerful actuator,
Check service data
Valve stem „hammers“. flow in the closing direction increase actuator force