b. Place Top Spring Washer on top of Spring and
then place the entire assembly on top of Pilot
Base assembly ensuring that the spherical
radius located on the Bottom Spring Washer
engages with spherical nose on Main Piston.
11. Install the Bonnet over the Spring and Spring
Washer Assembly. Thread the Bonnet onto the Top
Plate. Tighten wrench tight. Install and tighten Set
Screw.
12.
Turn Compression Screw clockwise until
dimension has been reached that was noted during
disassembly.
13.
Tighten Compression Screw Lock Nut wrench tight.
14. For Lifting Lever Option, reinstall Release Nut
and Release Lock Nut onto Lifting Stem. Turn
clockwise until it matches the dimension noted
during disassembly.
a. Install Filter Plug into Bonnet vent hole (if
removed).
15. Install Pipe Plug (Pilot Valve) in port above vent
hole.
16.
Refer to Field Test Connection / Backflow
Preventer Option for reassembly of Field Test
Connection
17. Making The Modulator Piston Assembly:
a. Install Spring Seal (Piston Top) into groove
on Modulator Piston Top. Be sure to have the
spring in the seal facing up.
b. Install O-Ring (Modulator Seat) into groove
on Modulator Piston Bottom.
c. Turn Modulator Piston Bottom over and
place O-Ring (Modulator Piston Bottom) into
inner groove.
d. Install Spring Seal (Piston Bottom) onto
Modulator Piston Bottom in outer groove.
Make sure spring is facing down.
e. Insert Modulator Piston Top into Modulator
Piston Bottom through the side with the
O-Ring (Modulator Piston Bottom) and the
Spring Seal (Piston Bottom).
f. Turn assembly over and install O-Ring
Retainer. The chamfered outside diameter
goes in first.
g.
Thread Lock Screw through the O-Ring
Retainer into Modulator Piston Top. Tighten
40 ± 5 in-lbs (4.5 ± 0.6 N-m).
h.
Final Modulator Piston Assembly is shown in
Figure 62.
18. Lubricate Spring Seals before inserting into
Modulator Base.
19. Insert Modulator Piston Assembly into Modulator
Base with the Modulator Piston Top going in first.
Push piston in with thumbs until it stops. There
will be some resistance due to the Spring Seals
compressing to fit into the bore of the Modulator
Base. If necessary for installation, insert the proper
wrench into the Lock Screw. Lightly tapping the
wrench with a hammer will force the Modulator
Piston Assembly into the Modulator base.
20. Install both O-Rings (Modulator Stop) into grooves
on Modulator Piston Stop.
21.
18. Insert Modulator Stop into Modulator Base with
the seat going in first. Make sure the side hole
in the Modulator Stop is facing towards the flat
side of the Modulator Base.
22.
Thread the Cap Screws (Modulator) through the
Modulator Stop into the Modulator Base. Tighten to
365 ± 30 in-lbs (41.2±3.4 N-m).
23. Do not install Modulator Assembly at this time.
D. Assembly of 39MV22/72
Making the Main Pilot.
1. Making the Main Piston Assembly
a. Insert the Piston Nose into the recess at the
threaded end of the Piston Top.
b. Slide the Piston Nut over the Piston Nose
and thread it onto the Piston Top. Place the
assembly in a vice with soft jaws and torque
the Piston Nut to 30 ± 3 ft-lbs (40.6±4 N-m).
c.
Install the Set Screw into the threaded hole
of the Piston Nut and hand tighten.
Spring Seal
(Piston Top)
Spring Seal
(Piston Bottom)
Modulator
Piston Bottom
O-Ring
(Modulator Seat)
Lock Screw
O-Ring Retainer
Modulator
Piston Top
Figure 62: Modulator Piston Assembly
XIX. Reassembly of Pilot Valve (Cont.)
Consolidated 2900 Series Generation II POSRV Instruction Manual
| 73
© 2021 Baker Hughes Company. All rights reserved.
