ARI Armaturen CHECKO-D DN 125-350 EN - Manual (Page 7)

Rev. 0040106001 2613 Page 2-7
Operating and installation instructions
CHECKO
®
-D DN 125-350
7.0 Care and maintenance
Maintanance and maintenance-intervals have to be defined by the operator according to
the requirements.
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 !
- See point 10.0 before dismantling the valve.
-
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 Wrong flow direction Correct the installation
Little flow Dirt sieve clogged. Clean / replace sieve.
Piping system clogged. Check piping system.
Leakage across valve seat. Body (pos.1) / valve plate (pos. 8) dam-
aged by foreign particles (Fig. 1)
Replaced valve, consult supplier/manu-
facturer.
Medium contaminated
(suspended solids). Clean valve.
Install dirt screen upstream of valve.
Rattling / banging
of the plug resp. of the
valve plate Nominal diameter of the valve in compli-
ance to the flow rate is too big Choose smaller nominal diameter
- high flow turbulences;
- the check valve 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