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Instruction Manual
D103300X012
Key numbers in this procedure are shown in figure 11 unless otherwise indicated.
1. Isolate the control valve from line pressure, and relieve pressure from the valve body. Shut off and disconnect all
lines from the power actuator.
WARNING
The edges of a rotating disk have a shearing effect that may result in personal injury. To help prevent such injury, stay clear
of the disk edges when rotating the disk (key 3).
CAUTION
Damage to the disk (key 3) may occur if the disk is not closed when the valve is being removed from the pipeline. If
necessary, apply operating pressure to the actuator temporarily to retain the disk in the closed position while removing the
valve from the pipeline.
2. Unscrew the flange bolts, and remove the valve from the pipeline.
3. Unscrew the machine screws (key 14), remove the retainer clip (key 13), and remove the seal retainer (key 2).
4. Remove the seal ring assembly (key 4).
5. The valve must be closed during seal ring installation to permit accurate centering of the seal. To install the new
seal ring assembly:
D For a soft seal, if the spring (key 5) was disassembled, hook the spring ends together. Work the spring into the
recess in the seal ring (key 4). Place the seal ring assembly onto the disk. Set the retainer onto the seal, making sure
proper alignment between the seal and retainer has been achieved.
D For the metal seal ring assembly, place the seal ring assembly onto the disk. Set the retainer onto the seal, making
sure proper alignment between the seal and retainer has been achieved.
6. Attach the seal retainer (key 2) and the retainer clips (key 13) to the valve body and secure with the machine screws
(key 14).
7. Be certain the disk is closed before installing the valve according to the Installation section on page 4 of this
manual.
Replacing the Disk, Shafts, or Bearings
Key numbers in this procedure are shown in figure 11 unless otherwise indicated.
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.
8580 Valve
April 2020
13
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