Masoneilan 10000 Series Globe Valve Instruction Manual | 6
© 2015 General Electric Company. All rights reserved.
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).
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.
(1) It is extremely important to tighten stud nuts evenly and in the sequence shown otherwise damage to the guides or
bushings could occur.
Valve Size
ANSI Class
Studs
Maximum Torque
(1)
in
mm
Qty
Size (in)
ft. lbs.
m.daN
¾
20
600
6
½-13
55
7,5
1
25
600
6
½-13
55
7,5
1½
40
600
6
½-13
55
7,5
2
50
600
8
½-13
55
7,5
3
80
600
8
5
/
8
-11
89
12
4
100
600
8
¾-10
170
23
6
150
600
12
¾-10
170
23
8
200
300
16
5
/
8
-11
89
12
600
20
¾-10
170
23
10
250
300
16
¾-10
170
23
600
16
1
1
/
8
-8
428
58
12
300
300
16
7
/
8
-9
236
32
600
16
1½-8
789
107
14
350
-
-
-
-
-
16
400
300
16
1¼-8
332
45
600
16
1
1
/
5
-8
789
107
Bolt Torque and Tightening Sequence
(1)