Data Sheet

ENVIRO-SEAL Bellows Seal
D101641X012
Product Bulletin
59.1:070
December 2012
2
Specifications
Applicable Valve Designs
NPS1/2through4FisherCL125through600Jeasy-e
valves (for example, EAT, EZ, ETR, etc.),JYD, and
JYS valves
Cycle Life
See tables 1, 2, 3, and 4 and the Cycle Life section.
The bellows is available in Jone-ply or Jtwo-ply
construction for higher pressures and longer cycle life
Pressures and Temperatures
(1)
See tables 5 and 6. Do not exceed the
pressure-temperature rating of the valve or the
maximum temperature of the packing and gaskets
Factory Testing Specification
Every bellows is tested to 1 X 10
-6
cubic centimeters
per second of helium
Bellows Seal Travel (Also See Cycle Life Section)
See table 7
Construction Materials
See table 10
Material Temperature Capabilities
(1)
Standard Packing:
Material
In-Body Process
Temperature Limits
(2)
Temperature Limits
of the Packing
Material
PTFE and PTFE/
Composition
-46 to 427_C
(-50 to 800_F)
-40 to 232_C
(-40 to 450_F)
Graphite Ribbon/
Filament
-46 t o 593_C
(-50 to 1100_F)
-18 t o 538_C
(3)
(0 to 1000_F
(3)
)
ENVIRO-SEAL Packing: See Bulletin 59.1:061
ENVIRO-SEAL Packing Systems for Sliding-Stem
Valves
Bellows Gasket: Graphite Laminate
-254 to 593_C (-425 to 1100_F)
Valve C omponents: Seethevalvebulletin
Applicable Stem and Yoke Boss Diameters
See t able 11
Maximum Flow Coefficients
See table 7
Bellows Spring Rate
Negligible for actuator sizing and selection purposes
Bellows Effective Area
When sizing an actuator, use the bellows effective
area instead of the valve stem area
NPS 1/2 through 2 Valves: 2.28 cm
2
(0.353 square
inches)
NPS 3 and 4 Valves: 8.65 cm
2
(1.340 square inches)
Dimensions
Seefigure2
Options
JRetrofit kits for installation in existing valves.
JENVIRO-SEAL packing systems (figure 1) with PTFE,
Graphite ULF, or Duplex packing materials; see
Bulletin 59.1:061
1. The pressure-temperature limits in this bulletin, in the valve bulletin, and any applicable code or standard limitation, should not be exceeded.
2. These in-body process temperatures assume an outside, ambient temperature of 21_ C(70_F).
3. Limit to 371_C (700_F) on oxidizing service.