Instruction Manual
D101643X012
ENVIRO-SEAL System - Rotary Valves
February 2019
2
Table 1. Specifications
Applicable Valve Designs
Fisher 8510B (single arrangements only), 8560 and
8532 eccentric disk control valves; A11, A31A, A31D
and A41 control valves; V150, V200 and V300
Vee‐Ball
t
control valves (Series B & Non‐Series B
(1)
);
V250 and V260 and BV500, CV500 and V500
eccentric plug rotary valves. Also see table 3.
Applicable Shaft Diameters
See table 3
Pressures and Temperatures
(2)
See table 2
1. Refer to Fisher Vee‐Ball V150, V200 & V300 instruction manual, for distinctions between Series B & Non‐Series B.
2. The pressure/temperature limits in this manual, in the valve literature, and any applicable code or standard limitation should not be exceeded.
Table 2. Maximum Application Temperature and Pressure for 100 PPM Service
ENVIRO‐SEAL PACKING MATERIAL
MAXIMUM APPLICATION TEMPERATURE
MAXIMUM APPLICATION
PRESSURE
_
C
_
F
Single PTFE
232
450
Not Restricted
(1)
Double PTFE
(2)
177
350
20.7 bar
(300 Psi)
Graphite
316
600
Not Restricted
(1)
1. For pressure ratings through CL600 of valves listed in this instruction manual.
2. These application conditions apply for double PTFE only in the valve types where double PTFE is available.
Valve/Actuator Shaft Coupler
To install an ENVIRO‐SEAL packing system on an A11, A31A, A31D, or 8532 valve with a non‐standard, non‐Fisher
produced actuator may require a special valve/actuator shaft coupler.
Table 10 contains a list of valve/actuator combinations and part numbers for the new coupler. If you are considering
installation of an ENVIRO‐SEAL packing system in another existing valve/actuator package, check table 10 to see if a
new coupler is required.
In some cases, coupler replacement is not required when retrofitting valve/actuator combinations. Table 11 contains a
list of valve/actuator combinations that can use existing couplers.
Description
Fisher packing systems are offered with exceptional sealing capabilities that you can easily install in existing valves or
that you can purchase with new valves. These systems help you conserve valuable process fluid. The external
live‐loading provides a constant load over the life of the packing material, which reduces the need for packing box
adjustment and maintenance.
The system design, coupled with very smooth shaft finishes and spring‐loading of the packing, provides longer service
with lower maintenance than many other designs.
