Flowserve Trunnball DL Ball Valves IOM - Manual (Page 6)

6
7 Ordering of Spare Parts
When placing an order for spare parts, specify:
• NAF-No: specified on the identification plate of the valve.
• Recommended spare part kit according to section 6.
• Quantity required.
Ordering example:
NAF-No: 8985KF-0200-BABAEA
Spare part kit: A
Quantity: 1pc
8 Maintenance
Many valves are installed in locations where their performance is
of critical importance to the entire process. Such valves should be
inspected regularly and any issues should immediately be corrected.
Valves intended for use on highly oxidizing media require
special handling, such as cleanliness and use of special
grease, to avoid safety hazards. Applicable regulations
must be followed and the following maintenance instructions
can therefore only serve as general guidance.
8.1 Removing the valve from the pipework
The procedure for inspection and maintenance requires no special
tools.
Ensure the process line is shut off, free of pressure and
drained of media.
1 Ensure that the recommended spare parts and gaskets for the
pipe flanges are available.
2 Before removing the valve from the pipeline, operate it several
times between the open and closed position to ensure that any
trapped media / pressure is released.
3 Shut off all compressed air connections and isolate all electrical
connections to the actuator.
4 Disconnect all compressed air lines and electric cables connected
to the actuator.
Caution. Liquid in the valve may be harmful.
5 Release the flanged joint between the valve and the pipework.
Then lift out the valve. Don’t use the actuator for lifting. Apply
all lifting forces to the valve itself and not to the actuator. See
Figure 1.
8.2 Disassembling the valve for inspection
and replacement of ball, seats and stem
packing
For part numbers, refer to Figure 3.
1 The actuator does not need to be removed for replacing the
seat rings and ball. However if the stem seal is leaking, the stem
packing must be replaced. Even if the stem seal does not leak,
we always recommend replacing the stem packing every time the
valve is disassembled. This will prevent unnecessary extra work
and downtime caused by a stem leakage in the future. We always
recommend the use of a stem sealing kit, spare part kit A.
2 Operate the valve to make certain that it is completely empty of
process media. Close the valve.
3 Remove the body cover (2).
Figure 4 – Lifting the ball with the valve in closed position – here
with the valve on a work bench, but it can be done with
mounted actuator
NAF Trunnball DL Ball Valves NFENIM4168-00-A4 01/15