IOM - TRUNNION BALL VALVES, UNIFLOW® BV BT-B9
©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - UNIFLOW BV BT
-B9 - Ed.18/03
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
Page 6
9. – TROUBLESHOOTING TABLE
Technical support always available through our website www.comeval.es or your local distributor.
10. – DISMANTLING THE VALVE
11. GOODS RETURN & DISPOSAL
- For any returned goods, the issuing company must provide information in written on any hazards and the precaution in
case of potentially polluting or harmful residues, or any mechanical damage that could present a health, safety or environ-
mental risk, as enforced by EU Health, Safety and Environment Law, including the Safety Data Sheet of the substances
identified as potentially hazardous.
- Valves are recyclable and not expected hazard to the environment, with the exception of soft parts (PTFE and rubber
compounds) that should be disposed separately only by approved procedure, and no incineration is permitted.
ATTENTION!
- Read the complete Manual before carrying out installation and repair work.
- Read chapter 6 before recommissioning
ATTENTION!
The following points must be observed:
- Pressureless pipe system.
- Medium must be cool.
- Plant must be drained.
- Note chapter 3 for proper handling and lifting.
- Additionally, in case of toxic, corrosive, flammable or caustic media:
- Purge pipe system carefully.
- Use proper protection equipment to avoid health harm.
- Adopt proper actions to avoid pollution of the environment.
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
Piping clogged
Check piping system
Broken flange
Bolts not properly tightened
Re-align piping and fit new valve
Check pipe system anchoring, guiding,
vibration and thermal changes
Mating flanges not properly aligned
Tensions in the pipe
Leakage between
body halves
Bolts loose or gasket damaged
Check alignment
Parts not well aligned
Retighten bolts or change gasket
Metal sealing surfaces damaged
Repair or change damaged surfaces
Too much pressure or temperature
Check the system
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
Too much pressure or temperature
Check the system
Valve not tight
at closing
Valve is not in closed position
Check correct handwheel rotation
Dirt trapped between ball and seats
Open and close the valve under pressure
to sweep the dirt trapped. Clean the system and
set a strainer upstream of the valve.
Repair or replace the valve if needed
Seats damaged
Replace seats
Ball surface damaged
Repair or change ball
Too much pressure or temperature
Check the system
Too high operating
torque, handle
hard to turn
Wrong turn direction (opposite)
Turn in the correct direction
Valve open being handle parallel to pipe,
clockwise direction to close
Packing gland too tightened
Check packing gland tightening
Packing rings damaged or with dirt
Inspect and replace/clean parts
Seats damaged or deformed
Inspect and replace if needed
Recheck valve duty
Body halves union bolts too tightened
Check bolts tightening
Stem seizure
Clean/lubricate/replace stem
Stem is bended
Replace stem
Too much pressure or temperature
Check the system
Too viscous or sticky fluid
