Valve Body Reassembly - GE Masoneilan 10000 Series Instruction Manual

7. Valve Body Reassembly

It is possible to change the valve from down seating to up seating
or vice versa. However, the plug stem must be re-pinned to the
opposite end of the plug. (If at all possible, a new stem should be
used.) Then, simply invert the valve body and reassemble. The
tolerances and clearances explained in this instruction apply to
either seating direction.
After completion of the required maintenance, the valve should be
reassembled using the following procedures.
Note: If any of the following steps were completed during
maintenance proceed to the next step. If the bonnet, body and
bottom flange were marked in relation to each other, remember to
align these marks to obtain the same orientation.
A. Clean all gasket surfaces.
B. Apply a small amount of lubricant to the seat ring threads and
sealing shoulder and install.
C. Using seat ring wrench, fabricated for removal, tighten seat ring
only enough to ensure a seal.
Do not over tighten. Do not strike the seat ring lugs.
This could distort the seat ring, resulting in unwarranted seat
leakage.
Note: Valve seats must be lapped before final assembly (See
section 6.3).
D. Install bottom flange gasket (13) bottom flange (10) and loosely
install body stud nuts (11). Install stem and plug assembly (1, 8
and 9).
Bolt Torque and Tightening Sequence
Valve Size
in mm
¾
1
1½
2
3
4 100
6 150
8 200
10 250
12 300
14 350
16 400
(1) It is extremely important to tighten stud nuts evenly and in the sequence shown otherwise damage to the guides or
bushings could occur.
© 2015 General Electric Company. All rights reserved.
(1)
ANSI Class
20 600
25 600
40 600
50 600
80 600
600
600
300
600
300
600
300
600
-
300
600
The upper plug must be installed so that the larger of the two V
notches in that plug is in line with the inlet of the valve. Placement
of a witness mark on the stem may be helpful.
E. Install bonnet gasket (13), bonnet (6) and loosely install body stud
nuts (11).
Note: For ease of accessibility the bonnet should be positioned
so that the packing flange studs are at right angles to the flow
center line.
Refer to Figure 10 for proper bolt torque and tightening sequence
specifications. Additionally the plug must be stroked manually
while evenly tightening the body stud nuts (11) around both
bonnet and bottom flange to ensure proper alignment and
prevent binding between the plug guides and the bushings.
F. Insert packing (17) and packing spacer (18).
G. Install packing follower (19) and packing flange (3).
H. Install packing flange stud nuts (2).
Do not tighten at this time. When placed in service they should
be tightened only enough to stop leaking.
I. Install stem lock nuts and travel indicator on plug stem.
J. Proceed to the appropriate actuator instructions for actuator to
body assembly.
Studs
Qty Size (in)
6 ½-13
6 ½-13
6 ½-13
8 ½-13
8 -11
/
5
8
8 ¾-10
12 ¾-10
16 -11
/
5
8
20 ¾-10
16 ¾-10
16 1 -8
/
1
8
16 -9
/
7
8
16 1½-8
- -
16 1¼-8
16 1 -8
/
1
5
Masoneilan 10000 Series Globe Valve Instruction Manual | 6
Maximum Torque (1)
ft. lbs. m.daN
55 7,5
55 7,5
55 7,5
55 7,5
89 12
170 23
170 23
89 12
170 23
170 23
428 58
236 32
789 107
- -
332 45
789 107