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XVII. Disassembly of Pilot Valve
A. 39PV07/37 Disassembly
Figures 30 and 31
1
Remove and discard the aluminum seals and sealing wire.
2.
Remove Cap (Compression Screw) by turning
counterclockwise.
3.
If a lifting lever is installed, also use Figure 31 to remove
the Lifting Lever assembly. Then return to Figure 30 to
continue disassembly.
a. The Lifting Lever Assembly consists of:
1 – Lever
1 – Drive Pin
1 – Cam Shaft
1 – Bushing
b. Remove Lifting Lever Assembly by turning Bushing
counterclockwise.
c. Turn Cap (Compression Screw) counterclockwise.
d. Measure distance from Release Lock Nut to the top of
the Lifting Stem for reassembly later.
e. Remove the Release Lock Nut and Release Nut by
turning counterclockwise.
4.
Measure and record Compression Screw height for later
use when resetting.
5.
Turn Compression Screw Lock Nut counterclockwise to
loosen.
6.
Turn Compression Screw counterclockwise to remove the
load on the Spring.
7.
Turn Set Screw counterclockwise to loosen.
8.
Bonnet can now be removed by turning counterclockwise.
9.
Spring and Spring Washers can now be removed.
Note: If Lifting Lever option is equipped, there is no need to remove
Drive Pin from Bottom Spring Washer assembly.
10. Remove the four Cap Screws (Top Plate) holding the Top
Plate to the Pilot Base. Remove and discard the Spring
Seal (Main Piston) and O-Ring (Top Plate).
11. Remove Main Piston from Pilot Base.
12. Removing the Insert Assembly.
The Insert Assembly consists of:
1 - Insert Top
1 - Insert Bottom
1 - Spring Seal (Insert)
© 2019 Baker Hughes, a GE company. All Rights Reserved.
1 - O-Ring (Insert)
Remove Insert Assembly from the top of the Pilot Base
with tool #4995401 as shown in Figure 58. Remove and
discard the O-Ring (Insert) on the bottom of the Insert
Assembly. Disassemble Insert Assembly by removing the
Insert Bottom from the Insert Top. Discard Spring Seal
(Insert).
13. Remove Adjuster Cap from the bottom of the Pilot Base
by turning counterclockwise.
14. Loosen Adjuster Lock Nut by turning counterclockwise.
15. Removing the Adjuster Assembly.
The Adjuster Assembly consists of:
1 – Adjuster Top
1 – Adjuster Bottom
1 – O-Ring (Adjuster Top)
1 – O-Ring (Adjuster Bottom)
1 – Spring Seal (Adjuster Top)
16. Turn Adjuster Assembly clockwise counting the number
of flats until assembly stops. Record number of flats for
reassembly.
17. Remove Adjuster Assembly from the Pilot Base by turning
counterclockwise. Remove O-Ring (Adjuster Top) and
O-Ring (Adjuster Bottom) from adjuster assembly and
discard. Disassemble Adjuster Top from the Adjuster
Bottom by turning Adjuster Top counterclockwise.
Remove Spring Seal (Adjuster Top) from Adjuster Top and
discard.
18. Refer to Field Test Connection / Backflow Preventer
Option (Section XXII.A) for disassembly of Field Test
Connection
B. Cleaning
1.
Clean parts to remove all rust, burrs, scale, organic
matter, and loose particles. Parts are to be free of any
oil or grease except for lubrication as specified in this
instruction.
2.
Cleaning agents used shall be such that effective cleaning
is assured without injuring the surface finishes or
material properties of the part.
3.
Acceptable cleaning agents include demineralized water,
nonphosphate detergent, acetone, and isopropyl alcohol.
Parts must be blown dry or wiped dry after cleaning.
4.
If you are using cleaning solvents, take precautions to
protect yourself from potential danger from breathing
Consolidated 2900-40 Series POSRV Maintenance Manual | 43
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