IOM - SLEEVED PLUG VALVES, UNIFLOW PP
©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - SLEEVED PLUG V
AL
VES, UNIFLOW PP
- Ed.16/05
Comeval V
alve Systems reserves the right to alter any technical data contained in this Manual without prior notice. Regularly updated data on www
.comeval.es
8. – 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 this Manual.
9. – TROUBLESHOOTING TABLE
Technical support always available through our website www.comeval.es or your local distributor.
10. – DISMANTLING THE VALVE
ATTENTION!
- Read chapters 10 & 11 before carrying out installation and repair work!
- Read chapter 6 before recommissioning!
Page 6
FAULT
POSSIBLE CAUSE
CORRECTING MEASURES
No flow
Not enough flow
Flange covers or protection not removed
Clear valve entrances
Valve closed or almost closed
Check valve position
Pipe system clogged
Check piping system
Broken flange
Bolts not properly tightened
Re-align piping and fit new valve
Mating flanges not properly aligned
Leakage between body/
cover
Bolts loose or gasket damaged
Retighten bolts or change gasket
Parts not well aligned
Check alignment
Metal Sealing surfaces damaged
Repair or change damaged surfaces
Leakage through the stem Normal wear after cycles or long time without
use
Retighten bolts
Packing or stem worn out or damaged
Replace parts
Metal Sealing surfaces damaged
Repair or change damaged surfaces
Valve not tight at closing
Valve is not in closed position
Check correct handle rotation
Dirt trapped between plug and sleeve
Open to sweep dirty and close back
Install a strainer upstream
Seats damaged
Machine plug or change seating parts
(sleeve and plug)
Plug surface damaged
Repair or change plug
Too much pressure
Check the system
Too high operating torque,
lever hard to turn
Packing too tight
Check packing gland tightening
Packing rings damaged or with dirt
Inspect and replace/clean parts
Stem is bended
Replace stem
Sleeve damaged
Repair or change sleeve
Too much pressure
Check the system
ATTENTION!
The following points must be observed:
- Pressureless pipe system
- Medium must be cool
- Plant must be drained
- Purge pipe systems in case of toxic, corrosive, flammable or caustic media
ATTENTION!
- It is essential that the safety regulations are observed when identifying faults.
