12.
For D through U orifice bellows valves, the
bellows is attached to the disc holder by right-
hand threads. Use a special spanner wrench on
the bellows ring to remove it by turning
counterclockwise (Figure 29).
For V and W orifice bellows valves, the bellows
is bolted to the disc holder. Remove these bolts
to disassemble the bellows from the disc holder.
ATTENTION!
The bellows convolutions are very thin and
fragile. Take care to protect them from damage.
13.
Remove the bellows gasket.
14.
Follow the procedure appropriate to the orifice
valve type:
For D through U orifice valves, remove the disc from
the disc holder as follows:
a. Clamp the stem portion of the disc holder,
disc end up, firmly between two wooden
V-blocks in a vise.
b. Start inserting special drift pins into the
holes in the disc holder (Figure 28) with the
tapered portion of the pins working against
the top of the disc, as indicated. See Figure
93 and Table 21 in the Maintenance Tools
and Supplies section for drift pin size.
c. Use a light machinist hammer to tap each
pin alternately until the disc snaps out of the
recess in the disc holder.
d.
For V and W orifice valves, remove the disc
from the disc holder as follows:
e. Turn the disc holder on its side.
f. Remove the retaining bolts.
g. Attach the lifting lug to the disc and lift out.
15. For O-Ring seat seal valves only, remove the
Retainer Lock Screw(s), O-Ring Retainer, and
O-Ring Seat Seal.
B.1 Nozzle Removal
B.1.1 Remote Sense Nozzle
1. 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.
2.
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 30).
ATTENTION!
Exercise care when inserting a rod or pipe
in the outlet. Ensure the valve nozzle is
not damaged during the operation.
3.
Use a large pipe wrench on the nozzle flange to
remove the nozzle from the base (Figure 31).
ATTENTION!
The nozzle is normally removed for
routine maintenance and service.
Vise
Bellows Ring
Disc Holder
Bellows
Convolutions
Spanner Wrench
Soft Material
Bellows Gasket
Figure 29: Removal of Bellows Ring
Drift Pin
Drift Pin
Disc Holder
Disc
Figure 30: Removing the Disc with Drift Pins
XIII. Disassembly of the 2900 POSRV (Cont.)
Consolidated 2900 Series Generation II POSRV Instruction Manual
| 37
© 2021 Baker Hughes Company. All rights reserved.
