Instruction Manual
D103211X012
NotchFlo DST Valve
March 2011
7
Table 4. CL900, 1500, and 2500 Recommended Torque for Packing Flange Nuts (non live‐loaded)
VALVE STEM
DIAMETER
PRESSURE RATING
TORQUE
N
S
m
lbf
S
ft
mm
Inches
Min
Max
Min
Max
12.7
1/2
CL900
12
18
9
13
CL1500
15
22
11
16
19.1
3/4
CL900
27
41
20
30
CL1500
34
50
25
37
25.4
1
CL900
42
62
31
46
CL1500
52
77
38
57
CL2500
61
91
45
67
31.8
1‐1/4
CL1500
68
102
50
75
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
RATING
VALVE SIZE, NPS
BOLT TORQUES
(1, 4)
SA193‐B7, SA193‐B8M Class 2
(3)
SA193‐B8M Class 1
(2)
N
S
m
Lbf
S
ft
N
S
m
Lbf
S
ft
CL600
1
122
90
61
45
2
91
67
43
32
3
163
120
84
62
4
258
190
149
110
6
740
550
‐ ‐ ‐
‐ ‐ ‐
8
550
405
‐ ‐ ‐
‐ ‐ ‐
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.