Fisher NotchFlo DST CL300 Instruction Manual page 8

NotchFlo DST Valve
March 2011
Table 6. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL900 and CL1500, Fisher NotchFlo DST
Valves
VALVE VALVE SIZE,
RATING NPS
1 or 1‐1/2
CL900 & 1500
1. Determined from laboratory tests.
2. SA193‐B8M annealed.
3. SA193‐B8M strain hardened.
Table 7. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL2500 Fisher NotchFlo DST Valves
VALVE RATING
CL2500
1. Determined from laboratory tests.
2. SA193‐B8M strain hardened.
Table 8. Valve Stem Connection Torque and Hole Size for Pin
VALVE STEM DIAMETER
mm
12.7
19.1
25.4
31.8
If there is undesirable packing leakage with other than spring‐loaded PTFE V‐ring packing, first try to limit the leakage
and establish a stem seal by tightening the packing flange nuts (key 21, figure 7 through 12) to at least the minimum
recommended torque in table 3 or 4. However, do not exceed the maximum recommended torque in table 3 or 4. or
excessive friction may result. If leakage continues, replace the packing by following the numbered steps presented in
the Replacing Packing procedure.
If the packing is relatively new and tight on the valve plug stem, and if tightening the packing flange nuts does not
stop the leakage, it is possible that the stem is worn or nicked so that a seal cannot be made. The surface finish of a
new stem is critical for making a good packing seal. If the leakage comes from the outside diameter of the packing, it
is possible that the leakage is caused by nicks or scratches around the packing box wall. While replacing the packing
according to the Replacing Packing procedure, inspect the valve plug stem and packing box wall for nicks or scratches.
8
SA193‐B7, SA193‐B8M Class 2
NSm
258
2 373
3 712
4 942
6 2800
8 2800
VALVE SIZE
NPS
1
2
3
4
6
TORQUE, MINIMUM TO MAXIMUM
Inches NSm
1/2 81‐115
3/4 237‐339
1 420‐481
1‐1/4 827‐908
(1)
BOLT TORQUES
(3)
LbfSft NSm
190 149
275 237
525 509
695 705
2070 ‐ ‐ ‐
2070 ‐ ‐ ‐
BOLT TORQUES
SA193‐B7, SA193‐B8M Class 2
NSm
390
740
2240
2800
2800
LbfSft mm
60‐85 3.20 ‐ 3.25
175‐250 4.80 ‐ 4.88
310‐355 6.38 ‐ 6.45
610‐670 6.38 ‐ 6.45
Instruction Manual
D103211X012
(2)
SA193‐B8M Class 1
LbfSft
110
175
375
520
‐ ‐ ‐
‐ ‐ ‐
(1)
(2)
lbfSft
290
550
1650
2070
2070
HOLE SIZE
Inch
0.126 ‐ 0.128
0.189 ‐ 0.192
0.251 ‐ 0.254
0.251 ‐ 0.254