Fisher D Series, Instruction Manual, Page: 5 / 12

Designs D & DA
5
Figure 3. Packing Arrangements.
C0755-1 / IL
from the bonnet. Release all pressure from the actua-
tor and relieve spring precompression. Use lock-out
procedures to be sure that the above measures stay in
effect while you work on the equipment.
Disconnect the stem connector, and then remove the
actuator from the valve body by unscrewing the actua-
tor yoke locknut (key 14).
2. Loosen the packing flange nuts (key 15) so the
packing is not tight on the valve stem. Remove any
travel indicator parts and stem locknuts from the valve
stem threads.
3. Unscrew the bonnet (key 5) from the valve body
(key 1). Carefully lift off the bonnet and valve plug/
stem assembly (key 4) as a unit. Set the bonnet on a
protective surface to prevent damage to the bonnet
threads and gasket surface.
4. Remove the valve plug/stem assembly from the
bonnet. If you plan to re-use the valve plug, tape or
otherwise protect the valve plug seating surface and
the stem threads to prevent damage.
5. Remove the bonnet gasket (key 7). Cover the
opening in the valve body to protect the gasket sur-
face and prevent foreign material from getting into the
body cavity.
6. Remove the packing flange nuts, packing flange,
upper wiper, and follower (keys 15, 12, 21, and 10).
Carefully push out all the remaining packing box parts
from the bonnet using a rounded rod or other tool that
will not scratch the packing box wall or bottom guide
bushing. Clean the packing box and the metal packing
box parts.
7. Inspect the valve stem threads and packing box
surfaces for any sharp edges that might cut the pack-
ing. Scratches or burrs could cause packing box leak-
age or damage to the new packing. If you cannot im-
prove the surface condition by light sanding, replace
the damaged parts.