Seal Maintenance - Emerson Fisher 8532 Instruction Manual

8532 Valve
June 2017
3. Loosen the flange bolting that holds the valve. Make sure the valve cannot slip or twist while loosening and
removing the bolting.
4. Before removing the valve from the pipeline, make sure the valve disk is closed. Removing the valve with the disk
open could cause damage to the disk, piping, or pipe flanges.
5. After removing the valve from the pipeline, move the valve to an appropriate work area. Always support the valve
properly.
6. When valve maintenance is complete, refer to the Installation procedures in this manual.

Seal Maintenance

Note
For larger valves, it is possible to replace the seal (key 5) while the actuator is mounted to the valve and can be accomplished by
cycling the valve to 90 degrees open.
Key numbers in this procedure are shown in figures 9 and 10 unless otherwise indicated.
1. After removing the valve from the pipeline, remove the manual or power actuator. Manually rotate the upper shaft
(key 3) counterclockwise until the disk has moved a full 180 degrees away from the closed position.
WARNING
Avoid personal injury or property damage caused by the impact of a falling or tipping of a large valve. Support large valves
during maintenance.
2. Lay the valve flat on a work bench in a secure position with the retaining ring (key 18) and retaining ring screws
(key 19) facing up. Properly secure the valve on a suitable worktable so it cannot slip, twist, or fall during
maintenance. Remove all retaining ring screws.
3. Remove the retaining ring by placing a socket head cap screw from the retaining ring in each of the two retaining
ring jacking screw holes. Slowly turn the screws until the retaining ring has been lifted from the valve body. Remove
the retaining ring to expose the seal in the T‐slot area of the valve body.
Note
The 8532 valve is available with different seal designs and components. See figure 2 to identify the specific seal design.
CAUTION
In the following procedure, take care not to damage the seal or T‐slot area of the valve body during removal of the seal.
4. Insert a regular screwdriver or other similar tool under the top edge of the seal and gently pry the seal out of the
T‐slot area in the valve body. Take care not to damage the seal or T‐slot area of the valve body. After the seal has
been removed, clean the T‐slot area, retaining ring and, if required, polish the disk (key 2) thoroughly with fine steel
wool or other appropriate material.
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Instruction Manual
D101550X012