Fisher NotchFlo DST CL1500, Инструкция по эксплуатации, Страница: 8 / 24

Instruction Manual
D103211X012
NotchFlo DST Valve
March 2011
8
Table 6. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL900 and CL1500, Fisher NotchFlo DST
Valves
VALVE
RATING
VALVE SIZE,
NPS
BOLT TORQUES
(1)
SA193‐B7, SA193‐B8M Class 2
(3)
SA193‐B8M Class 1
(2)
N
S
m Lbf
S
ft N
S
m Lbf
S
ft
CL900 & 1500
1 or 1‐1/2 258 190 149 110
2 373 275 237 175
3 712 525 509 375
4 942 695 705 520
6 2800 2070 ‐ ‐ ‐ ‐ ‐ ‐
8 2800 2070 ‐ ‐ ‐ ‐ ‐ ‐
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
VALVE SIZE
BOLT TORQUES
(1)
SA193‐B7, SA193‐B8M Class 2
(2)
NPS N
S
m lbf
S
ft
CL2500
1 390 290
2 740 550
3 2240 1650
4 2800 2070
6 2800 2070
1. Determined from laboratory tests.
2. SA193‐B8M strain hardened.
Table 8. Valve Stem Connection Torque and Hole Size for Pin
VALVE STEM DIAMETER TORQUE, MINIMUM TO MAXIMUM HOLE SIZE
mm Inches N
S
m Lbf
S
ft mm Inch
12.7
19.1
25.4
31.8 1/2
3/4
1
1‐1/4
81‐115
237‐339
420‐481
827‐908
60‐85
175‐250
310‐355
610‐670
3.20 ‐ 3.25
4.80 ‐ 4.88
6.38 ‐ 6.45
6.38 ‐ 6.45 0.126 ‐ 0.128
0.189 ‐ 0.192
0.251 ‐ 0.254
0.251 ‐ 0.254
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.