Fisher 8580 - Replacing the Packing

Instruction Manual
D103300X012
8580 Valve
April 2020
10
Figure 5. Packing Arrangement Details
STANDARD PACKING
PTFE V‐RING
GRAPHITE RIBBON
GE39901‐A
GE39986‐A
ENVIRO‐SEAL PACKING
SINGLE PTFE PACKING
GRAPHITE PACKING
GE40113‐A
GE40118‐A
THESE TWO SURFACES SHOULD REMAIN PARALLEL AS YOU ALTERNATELY AND EVENLY TIGHTEN THE PACKING NUTS (KEY 28).
NOTES:
WITH CONDUCTIVE PACKING, THE FEMALE ADAPTOR IN PTFE V‐RING PACKING IS CARBON‐FILLED PTFE.
APPLY LUBRICANT.
1
2
3
1. Tighten the packing flange nuts alternately and evenly, keeping the packing flange parallel with the valve flange
(see figure 5), until the Belleville springs are compressed 100% (or completely flat).
D For PTFE packing, loosen each packing flange nut one half turn (180_ of rotation).
D For Graphite packing, loosen each packing flange nut one quarter turn (90_ of rotation).
The target load of 85% compression has now been reached. If leakage continues, replace the packing components as
described in the following procedures.
Replacing the Packing
To replace the packing, the actuator must be removed. Also, the valve should be removed from the pipeline to allow
proper readjustment of the disk position.