Instruction Manual
D101643X012
ENVIRO-SEAL System - Rotary Valves
February 2019
7
Figure 3. ENVIRO‐SEAL PTFE Packing System for Fisher 8532, A11, A31A and A31D Valves
2
32B9116‐B
STACKING ORDER OF
PTFE PACKING RINGS
14B0095‐A
3
3
NOTES:
NOT USED ON VALVES LARGER THAN NPS 12
1
NOT USED ON A11
NOT USED ON A11 CL600, NPS 3, 4, AND 6
11. Install the packing flange (key 102) on the shaft, and install the packing nuts (key 101). Hand tighten them.
Note
In general, the following tightening procedure applies to all ENVIRO‐SEAL packing systems—both sliding‐stem and rotary.
CAUTION
Excessive force could cause valve body bushing displacement in Non‐Series B Vee‐Ball valves, allowing Vee‐Ball
misalignment, excessive seat leakage, or stalling of the actuator.
Note
Lubrication is required for the packing studs and nuts. Although it is important to properly lubricate the stud threads and internal
nut threads, it is also important to properly lubricate the contacting face of the nut. See figures 2 through 5 and 7 for lubrication
locations.
