Data Sheet

Sliding-Stem Packing Selection
D101986X012
Product Bulletin
59.1:062
December 2012
2
Table 1. Fisher Packing Selection Guidelines for Sliding-Stem Valves
Packing System
Maximum Pressure and
Temperature Limits for
100 PPM Service
(1)
Application Guideline for
Nonenvironmental
Service
(1)
Seal
Performance
Index
Service
Life
Index
Packing
Friction
(2)
Metric Imperial Metric Imperial
Single PTFE V-Ring
20.7 bar
-18 to 93
_C
300 psi
0 to 200
_F
Seefigure3
-46 to 232
_C
Seefigure3
-50 to 450
_F
Better Long Very low
Double PTFE V-Ring --- ---
Seefigure3
-46 to 232_C
Seefigure3
-50 to 450_F
Better Long Low
ENVIRO-SEAL PTFE
Seefigure2
-46 to 232
_C
Seefigure2
-50 to 450
_F
Seefigure3
-46 to 232
_C
Seefigure3
-50 to 450
_F
Best Very long Low
ENVIRO-SEAL Duplex
51.7 bar
-46 to 232
_C
750 psi
-50 to 450
_F
Seefigure3
-46 to 232
_C
Seefigure3
-50 to 450
_F
Best Very long Low
KALREZr with Vespelr CR-6100
(KVSP 500)
(3)
24.1 bar
4 to 260_C
350 psig
40 to 500_F
Seefigure3
-40 to 260_C
Seefigure3
-40 to 500_F
Best Long Low
ENVIRO-SEAL Graphite ULF
103 bar
-7 to 315_C
1500 psi
20 to 600_F
207 bar
-198 to 371_C
3000 psi
-325 to 700_F
Best Very long Medium
HIGH-SEAL Graphite ULF
103 bar
-7 to 315_C
1500 psi
20 to 600_F
290 bar
(4)
-198 to 538_C
4200 psi
(4)
-325 to 1000_F
Best Very long Medium
Graphite Composite / HIGH-SEAL
Graphite
--- ---
290 bar
(4)
-198 to 649_C
(5)
4200 psi
(4)
-325 to 1200_F
(5)
Better Very long Very high
Braided Graphite Filament --- ---
290 bar
-198 to 538_C
(5)
4200 psi
-325 to 1000_F
(5)
Good Moderate High
Graphite ULF --- ---
290 bar
-198 to 538_C
4200 psi
-325 to 1000_F
Better Very long Medium
1. The values shown are only guidelines. These guidelines can be exceeded, but shortened packing life or increased leakage might result. The temperature ratings apply to the actual packing
temperature, not to the process temperature.
2. See Fisher Catalog 14 for actual friction values.
3. The KALREZ pressure/temperature limits referenced in this bulletin are for Fisher valve applications only. DuPont may claim higher limits.
4. Except for the 9.5 mm (3/8 inch) stem, 110 bar (1600 psi).
5. Except for oxidizing service, -198 to 371
_C (-325 to 700_F).
Figure 2. Applications Guidelines Chart for 100 PPM Service
E0936-1
ENVIRO-SEAL GRAPHITE ULF
HIGH-SEAL GRAPHITE ULF
ENVIRO-SEAL PTFE ENVIRO-SEAL DUPLEX
SINGLE PTFE V-RING
KALREZ WITH
VESPEL CR-6100
(KVSP500)
TEMPERATURE, _C
TEMPERATURE, _F