Instruction Manual
D103042X012
D4 Valve
July 2015
17
Appendix A
Note
These instructions apply to valves manufactured with serial numbers less than 18679262.
Valve Packing
WARNING
Observe the warning at the start of the Maintenance section.
The valve stem packing can only be accessed from within the valve body. If packing maintenance is required, first
disassemble per steps 1, 2, and 6 or 7 in the Valve Plug and Seat Ring Disassembly section of this document.
Disassembly
1. Loosen the packing retainer locknut (key 22) with a spanner wrench or with a punch and hammer.
2. Unscrew the packing retainer (key 10) from the bonnet (key 5).
3. Remove the three Belleville springs (key 11), packing spacer (key 14), packing (key 13), and two anti‐extrusion rings
(key 12) from the bonnet, using a formed wire hook.
4. Clean and inspect the packing box wall to ensure that the packing surfaces are not damaged. If the surface
condition is damaged, and cannot be improved by light sanding, replace the bonnet by contacting your Emerson
Process Management sales office.
5. Inspect the valve stem for scratches or wear, and valve plug for wear or damage. Replace if necessary.
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