XIX. Reassembly of Pilot Valve (Contd.)
a. Press Spring Seal (Insert) into groove on the
Insert Bottom. Make sure spring is facing
upwards.
b. Install Insert Top over Insert Bottom with the
spring seal side going in first.
c. Lightly lubricate O-Ring groove now formed by
the two insert parts. This lubrication is used
to hold the O-Ring in place when it is being
inserted into Pilot Base.
d. Place O-Ring (Insert) into groove.
e. Final Insert Assembly is shown in Figure 49.
f. Turn Insert Assembly over and thread into
Pilot Base with T-handle groove wrench
(Part #4995401 Figure 81). Tighten wrench tight.
Make sure milled slot is facing up.
g. Lubricate Main Piston stem and cycle Main
Piston through Spring Seal (Insert) five times.
Note: For Dirty Service Option, please refer to
Dirty Service Option in section XXII.B for
assembly instructions.
4. Install O-Ring (Top Plate) into groove on top of
Pilot Base.
Note: For Dirty Service Option, O-Ring (Top Plate) is
installed into groove on top of the Dirty Service
Insert.
a. 39MV22
i. Lubricate the Spring Seal (Main Piston) and
Top Plate gland. Install the Spring Seal (Main
Piston) into Top Plate. The spring should be
oriented as shown in Figure 51.
ii. Lubricate Main Piston before installing.
Install the Main Piston into the Top Plate
with the Spring Washer bearing point going
in first. Be careful not to damage the Spring
Seal (Main Piston).
b. 39MV72
i. Lubricate the backup rings. Back-up Ring
(Upper) should be installed first with angle
surface facing you when installed.
ii. Back-up Ring (Lower) should be installed
second with angle facing away from you
when installed.
iii. Lubricate Spring Seal (Main Piston) and
Top Plate gland. Install Spring Seal (Main
Piston) into the Top Plate. The spring and
back-up rings should be oriented as shown
in Figure 51.
iv. Lubricate Main Piston Assembly before
installing. Install Main Piston into the Top
Plate with Spring Washer bearing point
going in first. Be careful not to damage
Spring Seal (Main Piston).
5. Install Main Piston / Top Plate Assembly into Pilot
Base by inserting small diameter end of Main Piston
through Insert Assembly.
Note: For Dirty Service Option, install Main Piston /Top
Plate Assembly into Dirty Service Insert instead
of Pilot Base.
6. Insert the four Cap Screws (Top Plate) through the
Top Plate and thread into the Pilot Base. Tighten to
25±2 ft-lbs (34±2.7 N-m).
7. If removed, thread Compression Screw Lock Nut
clockwise onto Compression Screw.
8. Thread Compression Screw into top of Bonnet
until the bearing point begins to protrude through
Bonnet.
9. Place Spring Washers on the ends of the Spring.
There is not a top or bottom Spring Washer unless
the Lifting Lever option is installed.
10. If pilot has Lifting Lever Option:
a. Place Spring over Lifting Stem and place on
Bottom Spring Washer.
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.
10. 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.
11. Turn Compression Screw clockwise until dimension
has been reached that was noted during
disassembly.
12. Tighten Compression Screw Lock Nut wrench tight.
13. For Lifting Lever Option, reinstall Release Nut and
Release Lock Nut onto Lifting Stem. Turn clockwise
until it matches the dimension noted during
disassembly.
14. Install Filter Plug into Bonnet vent hole (if removed).
15. Install Pipe Plug (Pilot Valve) in port above vent hole
(if removed).
16. Refer to Field Test Connection / Backflow Preventer
Option (Section XXII.A) for reassembly of Field Test
Connection.
Consolidated 2900 Series POSRV Maintenance Manual
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© 2018 Baker Hughes, a GE company. All Rights Reserved.
