
28 | BHGE
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and Supplies section for drift pin size.
• Use a light machinist hammer to tap each pin
alternately until the disc snaps out of the recess in the
disc holder.
15. For O-Ring seat seal valves only, remove the Retainer Lock
Screw(s), O-Ring Retainer, and O-Ring Seat Seal.
ATTENTION!
!
The nozzle is normally removed for routine maintenance and
service.
16. The nozzle is threaded onto the base and is removed by
turning it counterclockwise (from right to left). Before
removing the nozzle, soak the threaded joint with a
suitable penetrating liquid or solvent. If the nozzle is
frozen to the base, apply dry ice or other cooling medium
to the inside of the nozzle and heat the base from
the outside with a blowtorch in the area of the nozzle
threads.
ATTENTION!
!
Should heat be applied, use care to prevent cracking of cast
parts.
17. Using a three- or four-jaw chuck welded vertically to a
stand bolted to a concrete floor, clamp the nozzle into the
chuck and break the body loose with a heavy rod or pipe
(Figure 17).
ATTENTION!
!
Exercise care when inserting a rod or pipe in the outlet.
Ensure the valve nozzle is not damaged during the operation.
18. Use a large pipe wrench on the nozzle flange to remove
the nozzle from the base (Figure 16).
19. Remove the Nozzle from the Valve Base as suggested
in Figure 16, or by using a Hex wrench or a pipe wrench
on the flange as indicated in Figure 17.
20. The Main valve is ready for cleaning, inspection and
refurbishing.
21. Discard all O-Rings, guide rings, and seals.
XIII. Disassembly of the 2900-40 POSRV (Cont.)
Base
Nozzle
3 Jaw Chuck
Chuck Stand
8' (2.4 m)-10' (3 m)
Long Rod or
Heavy Pipe
Figure 16: Loosening the Nozzle from the Base
Base
Nozzle
Pipe Wrench
View From Top
View From Side
Figure 17: Removing the Nozzle from the Base