Flowserve 608 Series Ball Valve - Manual (Page 3)

SECTION 4.0 DISASSEMBLY
1 Note: If complete disassembly becomes
necessary, replacement of seats, packing, and
bearing material is required. All persons involved
in the removal and disassembly of the valve
should wear the proper protective clothing such as
face shield, gloves, apron, etc.
WARNING: BALL VALVES CAN TRAP
PRESSURIZED FLUIDS INBALL CAVITY WHEN
CLOSED
2. For your safety and protection, it is important
that the following precautions be taken prior to
removing the valve from service or before any
disassembly of the valve:
A. At all times during this entire procedure, keep
hands out of the valve. A remotely actuated valve
could close at any time and result in serious
injury.
B. Know what media is in the line. If there is any
doubt, check with the proper authority.
C. Wear any protective clothing or equipment
normally required when working with the media
involved.
D. Depressurize the line and valve as follows:
Open the valve and drain the line. Close and open
the valve to relieve any residual pressure that may
be in the valve prior to removing the valve from
service. Leave the valve in the open position.
After removal and prior to any disassembly, drain
any remaining media by placing the valve in a
vertical position and carefully closing and
opening the valve several times.
3. Support the valve on a platform.
4. Remove all accessories and adapter or lever
nut and lever.
5. Remove stem nut lock plate. Remove stem nut,
spring washers, ground spring, and packing
gland.
6. Mark the body joint flanges to assure correct
body and tailpiece orientation during reassembly.
Unscrew the body end connection studs and
separate the body and tailpiece(s).
7. Place the body and tailpiece(s) on a clean
wood or cardboard surface. Use care not to
damage the mating surfaces of the body or
tailpiece(s).
8. Rotate the valve to the closed position and
remove the ball. Use care not to damage the
surface of the ball during handling.
9. Take out the seat rings and body seal(s). Use
care not to damage the sealing surfaces of the
seat pocket. Note: on 3-piece valves it may be
necessary to remove the body seals
and seats before the ball.
10. Push the stem into the body cavity and out
through the end port. Remove the stem washer.
11. Clean all parts carefully. If necessary, use a
suitable solvent.
12. Check all sealing surfaces and parts for
damage or uneven wear.
NOTE: The ball and the surfaces against which
the seats and seals are installed should be
undamaged, clean and free of pit marks and
scratches. Light marring from the action of the ball
against the seats is normal and will not affect the
operation of the valve. Flaws which can be seen
but barely detected with fingertips are acceptable.
The stem and body surfaces that the thrust
bearing(s) and stem seal(s) contact must be
undamaged, clean, and free of pit marks and
scratches.