Instruction Manual
D101643X012
ENVIRO-SEAL System - Rotary Valves
February 2019
9
Figure 5. ENVIRO‐SEAL Graphite Packing System for Fisher 8532, A11, A31A and A31D Valves
1
2
3
4
14B0086‐A
32B9116‐B
4
STACKING ORDER OF
GRAPHITE PACKING RINGS
NOTES:
VALVES WITH SHAFTS LARGER THAN 38.1 mm (1-1/2 INCH) USE 3 GRAPHITE RINGS
NOT USED ON VALVES LARGER THAN NPS 12
NOT USED ON A11 VALVES
NOT USED ON A11 CL600 NPS 3, 4, AND 6
CAUTION
Do not use pneumatic air tools. Do not apply torque in excess of 34 N
S
m (25 ft
S
lbs) increments to any one flange nut at a
time. Excessive over‐torquing of the flange nuts may cause the studs to break.
D
For PTFE packing, loosen each packing flange nut 1/2 turn (180
_
of rotation).
D
For graphite packing, loosen each packing flange nut 1/4 turn (90
_
of rotation).
The “target load” of 85% compression has now been reached.
13. Install the actuator. Refer to the appropriate valve and actuator instruction manuals when connecting the valve to
the actuator.
Under normal conditions, the packing nuts should not require re‐tightening.
However, when servicing, if the springs do not remain at the target load of 85% compression, retighten the packing
box nuts according to step 11 above.