Instruction Manual
D100714X012
461 Valve
June 2017
11
Replacing Trim
Refer to figure 6.
Disassembly
1. Remove the actuator and the bonnet according to steps 1 through 6 of the Replacing Packing section.
2. Remove the valve plug and stem assembly (keys 3 and 10) from the valve. If the stem needs to be replaced, drive
the pin (key 11) out, and unthread the stem from the plug.
CAUTION
Never use an old stem with a new valve plug. The use of an old stem requires drilling a new pin hole through the stem,
which will weaken the stem.
3. If the valve plug needs replacing, replace the entire valve plug and stem assembly. Do not reuse the old stem on a
new valve plug. If only a new stem is necessary, screw the plug onto the new stem. Drill a 4.8 mm (3/16 inch) hole
through the stem using the plug pin hole as a guide. Drive the pin into the stem and plug.
Table 3. Recommended Torque for PTFE Type Packing Flange Nuts (non live-loaded)
VALVE STEM DIAMETER
PRESSURE RATING
TORQUE
N
S
m
lbf
S
ft
mm
Inches
Min
Max
Min
Max
19.1
3/4
CL600
10
15
7
11
CL900
27
41
20
30
CL1500
34
50
25
37
CL2500
41
61
30
45
25.4
1
CL600
17
25
13
18
CL900
42
62
31
46
CL1500
52
77
38
57
CL2500
61
91
45
67
31.8
1-1/4
CL600
24
36
18
27
CL900
56
83
41
61
CL1500
68
102
50
75
CL2500
81
122
60
90
4. With the stem and valve plug assembly removed, slide the liner (key 5) out of the valve body. Inspect the seat ring
(key 2) for nicks and scratches. Make sure the valve plug and seat ring contact surfaces are free of nicks and
scratches.
5. To remove the liner (key 5), break it loose by using cap screws in the tapped holes located in the liner's flange. (In
some very hard materials, i.e., R30006, the holes have been omitted; therefore, a sleeve puller or similar device
must be used).
6. To replace the seat ring (key 2), remove the valve from the line, or remove the pipe connected to the flange. Then,
unthread the seat ring retainer (key 4), and remove the seat ring through the bottom of the valve body.