Instruction Manual
D100381X012
HS Valve
June 2019
9
Table 5. Recommended Torque for Packing Flange Nuts (Non Live‐loaded Graphite Packing)
STEM
DIAMETER
VALVE BODY
RATING
(1)
TORQUE
N
S
m
lbf
S
ft
mm
Inches
Min
Max
Min
Max
12.7
1/2
CL900
12
18
9
13
12.7
1/2
CL1500
15
22
11
16
19.1
3/4
CL900
27
41
20
30
19.1
3/4
CL1500
34
50
25
37
25.4
1
CL900
42
62
31
46
25.4
1
CL1500
52
77
38
57
31.8
1‐1/4
CL900
56
83
41
61
31.8
1‐1/4
CL1500
68
102
50
75
50.8
2
CL1500
98
146
72
108
1. For intermediate class ratings, use the same torque as the next lower standard class.
Trim Maintenance
WARNING
D
Observe the warnings at the start of the Maintenance section.
Replacing Valve Plug, Seat Ring(s), and Guide Bushings
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut-off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock-out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Disconnect the valve stem from the actuator by unscrewing the cap screws and removing the stem connector.
3. To remove the valve plug, use the appropriate procedure below:
For direct-acting valves
:
a. Disconnect all pressure lines from the actuator. Unscrew the yoke locknut (valves with 3/8, 1/2, or 3/4-inch
stems) or eight cap screws and nuts (valves with 1 or 1-1/4 inch stems). Remove the actuator from the valve.
b. Unscrew the bonnet bolts bonnet nuts (steel valves). Remove the bonnet, valve plug , and stem as a unit.
c. Loosen the packing flange nuts and carefully slide the valve plug and stem out of the bonnet.
4. To replace the guide bushings, press them out of the bonnet and bottom flange. If the bushings cannot be removed
in this manner, machine out the old bushings. Press the new bushings into place. Spin or crimp the bushing
retaining lip into place per figure 7.
