ARI Armaturen EURO-WEDI EN - Manual (Page 8)

Page 8 Rev. 0040104000 0410
Operating and installation instructions
EURO-WEDI
®
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 point 10.0 and 11.0 prior to dismantling and repair work!
- read point 6.0 before restarting the plant !
Fault Possible cause Corrective measures
No flow Valve closed. Open valve.
Flange covers not removed. Remove flange covers.
Little flow Valve not sufficiently open. Open valve.
Dirt sieve clogged. Clean / replace sieve.
Piping system clogged. Check piping system.
Valve difficult to move or
cannot be opened Wrong direction of rotation Turn in correct direction (anticlockwise
to open valve).
Valve spindle leaking EDD-special spindle seal Replace valve or bonnet.
Leakage across valve seat. Valve not properly closed. Pull hand wheel tight without tools.
Seat (1) / plug (3) damaged by foreign
particles. (fig. 1-4). Replaced valve, consult supplier/manu-
facturer.
Pressure difference too high. Check system pressure and pressure
drop (max.
Δp = 16 bar).
Reduce system pressure.
Medium contaminated
(suspended solids). Clean valve.
Install dirt screen upstream of valve.
Valve with stroke limiter
and locking device cannot
be opened. Stroke limiter on spindle stop has been
tightened.
Locking device has been tightened. Turn stroke limiter upwards.
Slacken the locking device.
Flange broken between
valve and piping. Bolts tightened unevenly.
Mating flanges not properly aligned. Re-align piping and fit new valve!