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XIII. Disassembly of the 2900-40 POSRV
A. Removal of Pilot Valve from Main Valve
1. Make sure there is no media pressure in the vessel, in the
valve inlet, in the main valve, or in the pilot valve.
2. Disconnect the Sensing Tube, Dome Tube and Discharge Line
from the Pilot Valve.
3. All other external attachments should be removed to free
the Pilot Valve for Disassembly.
4. Loosen and remove the two cap bolts holding the pilot valve
to the mounting bracket.
5. Place parts in the order they are disassembled to facilitate
reassembly.
B. Disassembly of Main Valve
Note: If the pilot valve has not been removed, then refer to the
appropriate section above.
1.
If applicable, remove sensing tube fitting from Sensing
Tube
2.
Remove and discard Plug Filter from Sensing Tube (if
applicable).
3.
Loosen and remove the Stud Nuts on the Cover Plate.
ATTENTION!!
If valve is equipped with spring assist, carefully back off on
Stud Nuts in small increments to reduce preload on Cover
Plate.
4.
Remove the Bracket.
5.
Install 1/4" MNPT pipe plug into Cover Plate where dome
line is installed. Pipe plug will prevent Main Valve Piston
from falling out of Cover Plate when the assembly is
removed.
6.
Remove Cover Plate and Main Valve Piston assembly
from Base.
ATTENTION!!
If Main Valve Piston O-Ring or Spring Energize Seal is
damaged, then Main Valve Piston may fall out of Cover Plate
during disassembly.
7.
Remove pipe plug from Cover Plate.
© 2019 Baker Hughes, a GE company. All Rights Reserved.
Lower pressure and
stand clear of discharge
when working on valve
to avoid sever personal
injury or death.
Do not remove bolts if
pressure in line, as this
will result in severe
personal injury or death
Consolidated 2900-40 Series POSRV Maintenance Manual | 25
Wear necessary
protective equipment
to prevent possible
injury
Know all valve exhaust/
Leakage points to avoid
possible severe personal
injury or death
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