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XV. Reassembly of 4900 Series Main Valve
A. Lubricants and Sealants
1. Operating temperatures below -40°F (-40°C),
consult Factory.
2. Operating temperatures between -40°F and
+505°F (-40°C and 262.7°C)
a. Lubricate all O-Rings, except silicone, spring
energized seals, and back-up rings sparingly
with silicone grease (P/N SP505).
b. Seal all pipe threads with Teflon tape or pipe
sealant (P/N SP364-AB).
c. Lubricate standard threads and bearing points
with Jet-Lube, non-metallic, product code
#14613 (P/N4114510 or 4114511).
3. Operating temperatures above +505°F (262.7°C)
a. Lubricate all O-Rings, except silicone, spring
energized seals, and back-up rings sparingly
with silicone grease (P/N SP505).
b. Seal all pipe threads with Teflon tape or pipe
sealant (P/N SP 364-AB).
c. Lubricate standard threads and bearing points
with nickel graphite N5000 (P/N 4114507)
or equivalent.
B. Assembly Procedure for O-Ring
Seats
B.1 Installation of Nozzle
1. Install Nozzle O-Ring over threads of Nozzle and
slide until it hits the backside of the flange. Install
Nozzle into Base with the appropriate wrench
and torque to the value shown in Table 2. Refer
Bore
Type
in.
1.00
1.50
1.50
2.00
Standard
Bore
3.00
4.00
6.00
8.00
3.00
4.00
Full Bore
6.00
8.00
10.00
34 |
Baker Hughes
Table 3: O-Ring Retainer Screw(s) Torque Values
Inlet Size
Orifice
mm
25.4
D,E,F
38.1
D,E,F
38.1
G,H
50.8
G,H,J
76.2
J,K,L
101.6
L,M,N,P
152.4
Q,R
203.2
T
76.2
3"
101.6
4"
152.4
6"
203.2
8"
254.0
10"
Table 2: Nozzle Torque Values
Valve Inlet Size
in.
mm
1.00
25.4
1.50
38.1
2.00
50.8
3.00
76.2
4.00
101.6
6.00
152.4
8.00
203.2
Bolted Nozzles
to Figure 45 and Table 9 for specifications on
appropriate spanner wrench.
2. Install the Seat Seal O-Ring in the disc groove
and position the O-Ring Retainer onto the Disc.
Install the Lock Screw(s) and tighten to the
torque values listed in Table 3.
3. For valves with separate retainer and sensing
tube, assemble the tube to the retainer before
attaching to the disc. Insert the tube through the
retainer and attach using the hex nut. Torque to
25±5 ft-lbs (33.9±6.8 N-m).
4. Insert an O-Ring into the O-Ring groove of the
Sensing Retainer Nut. Thread nut into the top
of the disc, being careful not to dislodge the
O-Ring. Torque to 25±5 ft-lbs (33.9±6.8 N-m).
Note: For Teflon seat O-Rings, heat to 300°F
(149°C) for ten minutes before
installation.
No. of
Bolt Size
Bolts
N/A
5/8-24UNC
N/A
5/8-24UNC
N/A
5/8-24UNC
N/A
5/8-24UNC
4
5/16-24UNC
6
3/8-24UNF
6
3/8-24UNF
6
3/8-24UNF
6
3/8-24UNF
4
3/8-24UNF
6
3/8-24UNF
8
3/8-24UNF
8
3/8-24UNF
© 2020 Baker Hughes Company. All rights reserved.
Torque Specification
ft-lbs ± 5%
Nm ± 5%
100
136
100
136
160
217
475
644
1070
1451
1445
1959
1865
2529
60
81.4
Torque Value
in-lbs ±5
N-m ±0.5
720
14.0
720
14.0
720
27.7
720
27.7
120
14.0
245
27.7
245
27.7
245
27.7
245
27.7
245
27.7
245
27.7
245
27.7
245
27.7
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