Data Sheet

Sliding-Stem Packing Selection
D101986X012
Product Bulletin
59.1:062
December 2012
3
Figure 3. Applications Guidelines Chart for Nonenvironmental Service
ENVIRO-SEAL
GRAPHITE ULF
HIGH-SEAL
GRAPHITE
AND
GRAPHITE
COMPOSITE
ENVIRO-SEAL PTFE AND
ENVIRO-SEAL DUPLEX
SINGLE AND
DOUBLE
PTFE V-RING
KALREZ WITH
VESPEL CR-6100
(KVSP500)
TEMPERATURE, _ C
TEMPERATURE, _F
E0937-1
HIGH-SEAL GRAPHITE ULF,
GRAPHITE ULF, AND
BRAIDED GRAPHITE FILAMENT
The packing selection guidelines in table 1 present two
categories of service conditions. The first category
defines packing systems designed for environmental
or fugitive emission applications where 100 ppmv
(parts per million volume) seal performance is
required, using EPA Method 21 per ANSI/FCI 91-1 as
themeasurementtechnique(seefigure2).Thesecond
category defines application guidelines for
nonenvironmental services (see figure 3). Depending
on category requirements, different
pressure/temperature guidelines have been
established for the packing systems. In addition, a
given packing design has certain characteristics
concerning seal performance, service life, and friction.
The pressure and temperature guidelines and the
relative comparison of these characteristics are
defined in table 1, figure 2, and figure 3.
Seven packing selections are offered for
environmental service: Single PTFE V-ring (easy-e
valves such as ED and EWT), ENVIRO-SEAL PTFE,
ENVIRO-SEAL Duplex, KALREZ with Vespel CR-6100,
ENVIRO-SEAL graphite ULF, and HIGH-SEAL graphite
ULF. Each of these options has different
pressure/temperature service ranges.