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 5
7. – CARE AND MAINTENANCE
The operator must define maintenance and maintenance-intervals to meet requirements.
- Check for body and seat tightness and valve smooth operation without additional tools.
- Check the valve surface inside and outside. Keep valve surface is in good condition and retouch coating protection if
any when needed. If advanced corrosion or erosion is observed, double check service and valve features and replace
the valve properly.
7.1 Parts disasseembly and assembly
- Packing, seats, ball and stem can be easily dismounted by using common tools.
VALVE DISASSEMBLY
- Place the valve in vertical position so the body flange (part 1) leads on the working table.
- Release any pressure that may be retained in the body cavity by using the drain valve (part 4) or by opening or closing
the main valve. Leave the valve in the closed position to continue the disassembly.
- Remove body bolting (parts 2 & 3) that retains the body halves (parts 1, 7) and remove the seats and ball carefully in
order not to damage the seals sittings.
- To remove the stem from the interior of the body (part. 14), first remove the cap screw, gasket, O-ring (19,20,21). Once
done there is free access to rest of parts..
- All the parts to be used in the assembly must be cleaned and stored in a dry and secure place. All the sealing surfaces
on the ball, seats, packing and metal faces must be carefully checked for corrosion and or erosion. Seats should have
no metal particles. All damaged parts must be replaced.
VALVE ASSEMBLY
- Before assembly all the sealing surfaces on the ball, seats, seals and metal faces must be carefully checked for dirt,
corrosion or erosion.
- Follow the above steps in the reverse order to reassemble the valve. Seats should perfectly fit; if necessary slightly
strike with a soft hammer. Once mounted, slowly operate the valve till a complete manoeuvre is covered, to allow perfect
adjustment between ball and seats.
- Seats, stem seals and ball must be lubricated with suitable lubricant. Please contact lubricant supplier for advice. This
will improve overall performance and torque due to less friction.
- After assembly check for leaks and the correct opening and closing of the valve.
After any maintenance work please refer to chapters 5 and 6 for installation / commissioning.
Recommended Spare parts:
Use only original spare parts.
It is advisable to keep packing rings (9), body seats (7), gasket (8) and body union gasket (5) as spare parts. Type and
number of each spare part to be stored according to many factors: service level, valves quantity, etc. In many cases a
good choice is to keep complete valves as spare part.
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.
ATTENTION!
- In the event of infrequent use, operate the valve as frequently as possible to avoid deposits of dirt and valve blocking.
- Before disassembling the valve, note chapters 3, 10 & 12.
- When using the valve as an end seal, the employers’ liability insurance association specifies the use of a safe
-
ty precaution such as a plug-in disc, blind flange, etc. With a medium jet that freely exists, secure the exit area.
- When the valve is operated, there is a crushing hazard between the ball and the seats. Ensure the valve is not
under operation in case hands are introduced inside the valve.
- Only carry out maintenance work in the pipework when the valve has been secured from operation (in case of
actuator, ensure it has been disconnected from the mains supply and secured from reactivation).
- Check the valve seat surface and the flow passage as well as the stem packing.
- Check the valve surface inside and outside and retouch coating protection when needed. If advanced corro
-
sion or erosion is observed, double check service and valve features and replace the valve properly.
ATTENTION!
- It is essential that the safety regulations are observed when identifying faults.
