ARI Armaturen CHECKO-D PN40 EN - Manual (Page 10)

Page 2-10 Rev. 0040106000 1613
Operating and installation instructions
CHECKO
®
-V PN6-160 / CHECKO
®
-D PN40
9.0 Troubleshooting table
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 Flange covers not removed.
(pos. 8; Fig. 1-2) Remove flange covers.
(pos. 8; Fig. 1-2)
Little flow Dirt sieve clogged. Clean / replace sieve.
Piping system clogged. Check piping system.
Leakage across valve seat. Wrong Installation Correct the Installation (see point 5.1).
CHECKO ® -V:
Seat (pos. 1.2) / plug (pos. 3) damaged
by foreign particles. (Fig. 1-6).
CHECKO
®
-D:
Body (pos.1) / valve plate (pos. 8) dam-
aged by foreign particles (Fig. 7)
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 to big Choose smaller nominal diameter
CHECKO
®
-V:
Use a plug damper execution: see
medium
- 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
CHECKO
®
-V:
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!