Reference Manual

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Figure 1-24. ENVIRO-SEAL PTFE Packing System
A6163
Figure 1-25. ENVIRO-SEAL Duplex (PTFE and
Graphite) Packing System
KALREZt Valve Stem Packing (KVSP)
systems
The KVSP pressure and temperature limits
referenced are for Fisher valve applications only.
KVSP with PTFE is suited to environmental use up
to 24.1 bar and 204°C (350 psi and 400°F) and, to
some non-environmental services up to 103 bar
(1500 psi). KVSP with ZYMAXXt, which is a
Figure 1-26. ENVIRO-SEAL Graphite
ULF Packing System
39B4612-A
carbon fiber reinforced TFE, is suited to 260°C
(500°F) service.
ENVIRO-SEAL Graphite Ultra Low
Friction (ULF) Packing (Fig. 1-26)
This packing system is designed primarily for
environmental applications at temperatures in
excess of 232°C (450°F). The patented ULF
packing system incorporates thin PTFE layers
inside the packing rings and thin PTFE washers on
each side of the packing rings. This strategic