Data Sheet

EW Valve
D100023X012
Product Bulletin
51.1:EW
August 2012
6
Figure 3. Fisher EWS Trim Details Showing Standard
Cage and Seating Construction
CLAMPED METAL
SEAT RING
W0989-2
C-seal Trim Description
C-seal trim (figure 5) is available for valves with port
diameters from 2.875 inches through 8 inches.
With C- seal trim, a balanced valve can achieve
high-temperature, Class V shutoff. Because the C-seal
plug seal is formed from metal (N07718 nickel alloy)
rather than an elastomer, a valve equipped with the
C-seal trim can be applied in processes with a fluid
temperature of up to 593_C (1100_F).
ENVIRO-SEAL and
HIGH-SEAL Packing
Systems
Fisher ENVIRO-SEAL and HIGH-SEAL packing systems
(figure 18) offer excellent sealing capabilities. These
systems easily install in your existing valves or can be
purchased with new valves. These systems help you
seal your process to conserve valuable process fluid
and to protect the environment against the emission
of hazardous or polluting fluids. The long-life and
reliability of these systems also reduce your
maintenance cost and downtime.
For applications requiring compliance with
environmental protection regulations, the unique
ENVIRO-SEAL packing system and, for hazardous
service, the ENVIRO-SEAL bellows seal bonnet (figure
19) are offered. The emission control packing system
or seal bonnet keeps emission concentrations below
the EPA 100 ppm requirement.
For an excellent stem seal in applications that are not
environmentally-sensitive, the HIGH-SEAL Graphite
ULF packing system is offered. The HIGH-SEAL packing
system provides excellent sealing at
pressure/temperature ratings beyond ENVIRO-SEAL
limits.
ENVIRO-SEAL packing systems, available with PTFE,
Graphite ULF, or Duplex packing, and the HIGH-SEAL
Graphite ULF packing system feature live-loading and
unique packing-ring arrangements for long-term,
consistent sealing performance.