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Instruction Manual
D103211X012
Table 4. CL900, 1500, and 2500 Recommended Torque for Packing Flange Nuts (non live‐loaded)
VALVE STEM
DIAMETER
mm
Inches
12.7
1/2
19.1
3/4
25.4
31.8
1‐1/4
CAUTION
The NotchFlo DST valve uses spiral‐wound gaskets which are crushed to provide their seal. A spiral‐wound gasket should
never be reused. Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket must be
installed upon reassembly. This is necessary to ensure a good gasket seal, since the used gasket will not seal properly.
The spiral‐wound gaskets are of special design. Failure to use genuine Fisher replacement parts may result in valve damage
and/or failure.
Packing Maintenance
Key numbers refer to figure 3 for PTFE V‐ring packing and to figure 4 and 5 for graphite ribbon/filament and graphite
ULF packing, unless otherwise indicated.
WARNING
To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing box
wall for nicks or scratches while performing the following procedures.
Use care to avoid damaging these surfaces.
For spring‐loaded single PTFE V‐ring packing, the spring (key 24) maintains a sealing force on the packing. If leakage is
noted around the packing follower (key 28), check to be sure the shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet, tighten the packing flange nuts (key 21, figure 7 through 12) until
the shoulder is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Replacing Packing
procedure.
Table 5. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL600 Fisher NotchFlo DST Valves
VALVE
VALVE SIZE, NPS
RATING
CL600
1. Determined from laboratory tests.
2. SA193‐B8M annealed.
3. SA193‐B8M strain hardened.
4. For other materials, contact your Emerson Process Management sales office for torques.
PRESSURE RATING
CL900
CL1500
CL900
CL1500
CL900
CL1500
1
CL2500
CL1500
SA193‐B7, SA193‐B8M Class 2
NSm
1
122
2
3
163
4
258
6
740
8
550
NSm
Min
12
15
27
34
42
52
61
68
BOLT TORQUES
(3)
LbfSft
90
91
67
120
190
550
405
NotchFlo DST Valve
TORQUE
lbfSft
Max
Min
18
9
22
11
41
20
50
25
62
31
77
38
91
45
102
50
(1, 4)
SA193‐B8M Class 1
NSm
61
43
84
149
‐ ‐ ‐
‐ ‐ ‐
March 2011
Max
13
16
30
37
46
57
67
75
(2)
LbfSft
45
32
62
110
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7
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