Replacing The Seal Ring Assembly; Replacing The Disk, Shafts, Or Bearings - Emerson Fisher 8580 Instruction Manual

Instruction Manual
March 2010
page 15 of this manual, before returning the valve to
service.

Replacing the Seal Ring Assembly

Perform this procedure only if the control valve is not
shutting off properly (that is, leaking downstream).
This procedure does not require removing the
actuator from the valve body.
Key numbers in this procedure are shown in
figure 10 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
10 unless otherwise indicated.
8580 Valve
11