Consolidated 13900 Series POSRV Maintenance Manual
|
19
© 2018 Baker Hughes, a GE company. All rights reserved.
XIV. Reassembly of Pilot Valve
1. Before reassembly, all parts should be thoroughly
cleaned and free from burrs.
2. Reassemble disc assembly as shown in Figure 8.
3. Ensure the Pilot Base Flange (21) is installed on the
Pilot Base (20). Place the Pilot Valve Base (20) and
Flange (21) over the main valve bonnet studs (44) and
secure with Nuts (45).
4. Place a new pilot bonnet to Base Gasket (25) on Base
(20).
5. Put a small amount of lubricant
1
on the spindle (31) tip
and lower Spring Washer (30) bearing surface of the
spindle. Thread the disc on the spindle and assemble
the Spring (41) and Spring Washers (30) and (32) on the
spindle.
6. Insert the disc, spindle, spring and spring washer
assembly into the bonnet.
7. Install the Adjusting Ring (28) on the base (top of
adjusting ring flush with seat).
8. Place a small amount of lubricant on the ball end of the
Compression Screw (40).
9. Holding the bonnet and spindle (so that disc will not
drop), install the bonnet assembly to the pilot base.
Care should be taken to prevent the disc seat surface
from rotating against base seat surface.
10. Insert the compression screw into the pilot bonnet
and rotate clockwise until previously recorded
measurement in disassembly procedure is obtained.
11. Reestablish the position of the adjusting ring as follows:
a. Using a pointed tool (BHGE Part No. 4215501), turn
the adjusting ring to the right slowly, thus raising the
ring until it touches the disc.
b. Then, counting the notches, turn the adjusting ring to
the left, thereby lowering the ring, until the original
position recorded in the disassembly procedure is
obtained.
c. Insert adjusting ring pin and gasket. Tighten securely.
12. Remove pilot valve from main valve bonnet if main
valve is to be disassembled.
13. Test pilot valve per instruction outlined under "Testing"
before assembly onto main valve.
Note: Lubricant should be “Twist” by Century Corp., or equivalent.
