Emerson fisher ETR Instruction Manual page 11

Instruction Manual
D100391X012
6. Avoid scratching the packing box walls when removing the old packing parts. Clean the packing box (see figure 4),
and clean, inspect, or replace metal packing parts. Generally, the metal packing parts are not part of the packing
kits listed in the Parts List section, and they must be ordered individually.
7. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.
Scratches or burrs on the stem surfaces can cause packing box leakage or damage to new packing. If the surface
condition cannot be improved by light sanding, replace the damaged parts by following the appropriate steps in the
Trim Maintenance procedure.
Note
If the control valve assembly was purchased for an application where the service temperatures are under 232_C (450_F), the
bonnet may be unscrewed from the valve body. Where temperatures are greater than 232_C (450_F), the bonnet is seal welded to
the valve body.
CAUTION
To prevent possible product damage, set the bonnet on a protective surface in the following procedure.
8. If necessary, remove the bonnet assembly from the valve by unscrewing it. Some applications require seal welding
the bonnet to the valve body, and the bonnet should not be removed. Set the bonnet on a protective surface to
prevent damage to the bonnet gasket surface.
EDR and ETR Valves
March 2016
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