8580 Valve
Instruction Manual
March 2010
12
Figure 5. Orientation of Bearing Tabs
BEARING TAB
BEARING TAB
BACKSIDE OF VALVE
Table 6. Follower Shaft Internal Threads
VALVE SIZE
THREAD SIZE
DN NPS
50 2 M8 X 1.25
80 3 M10 X 1.50
100 4 M12 X 1.75
180 6 M16 X 2.00
200 8 M20 X 2.50
250 10 M20 X 2.50
300 12 M24 X 3.00
1. Isolate the control valve from the line pressure,
release pressure from both sides of the valve body,
and drain the process media from both sides of the
valve. If using a power actuator, also shutoff all
pressure lines to the power actuator, release all
pressure from the actuator. Use lock-out procedures
to be sure that the above measures stay in effect
while you work on the equipment.
CAUTION
When removing the actuator in the
following step, use a wheel puller to
separate the actuator parts from the
valve shaft. Do not drive the actuator
parts off the valve shaft because this
could damage valve trim components.
2. Remove the actuator per instructions in separate
actuator instruction manuals, then remove the cap
screws and nuts (keys 35 and 36). Remove the
clamp (key 130, figure 3) if the strap (key 131,
figure 3) is used.
3. Remove the packing flange nuts and the packing
flange (key 26) if used and pull out the packing
follower (key 25).
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