Instruction Manual
D101642X012
ENVIRO-SEAL Sliding-Stem Valves
July 2017
2
Table 1. Specifications
Applicable Product Types and Stem Diameters
TÜV Certification
TÜV has certified the stem sealing capabilities of
ENVIRO
-
SEAL PTFE and Graphite ULF packing systems
for sliding
-
stem valves with TA Luft emission control
requirements. See figures 8 and 9 for copies of these
certificates
Pressures and Temperatures
(2)
See figure 2. Figure 2 applies only to ENVIRO
-
SEAL
packing for 100 ppm service. Pressure and
temperature ratings for non
-
environmental service
are in the packing bulletins. See the appropriate valve
instruction manual for additional pressure and
temperature ratings.
1. For availability of ENVIRO
-
SEAL packing system with a specific valve, please contact your
2. The pressure/temperature limits in this manual, in the valve literature, and any applicable code or standard limitation, should not be exceeded.
Figure 2. Applications Guidelines for 100 ppm Service
A6142-1
NOTE:
FOR MAXIMUM CYCLE LIFE, GRAPHITE ULF PACKING SHOULD BE USED IN SERVICES WHERE THE VAST MAJORITY OF THE VALVE CYCLES OCCUR AT TEMPERATURES
OF 150
_
C (300
_
F) OR GREATER.
ENVIRO
-
SEAL GRAPHITE ULF AND
HIGH
-
SEAL GRAPHITE ULF
ENVIRO-SEAL DUPLEX
ENVIRO-SEAL PTFE
Description
ENVIRO
-
SEAL packing systems, with exceptional sealing capabilities, can be easily installed into your existing valves or
can be purchased with new valves. These systems help seal your process to conserve valuable fluids, and protect the
environment against the emission of hazardous or polluting liquids and gases. The external live
-
loading provides a
constant load over the life of the packing material, which reduces your need for packing box adjustment and
maintenance.
If the piping and valve are insulated, do not allow insulation to extend above the yoke boss surface, covering the
ENVIRO
-
SEAL packing arrangement. Keep the ENVIRO
-
SEAL packing arrangement exposed to ambient air conditions.
