Appendix A (Packing Constructions With Lot Numbers Less Than 0410-Xxxx) - Emerson Fisherr D2 FloPro Instruction Manual

Instruction Manual
D103031X012
Appendix A
(Packing Constructions with Lot Numbers Less Than 0410)
Appendix A provides information on packing constructions manufactured with lot numbers less than 0410-xxxx.
Packing and Valve Trim Maintenance (Appendix A)
Note
The following maintenance procedures apply to both air-to-open and air-to-close actuator configurations, except as noted.
Key numbers are referenced in figures 10 and 11.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve.
2. For air-to-open actuator action only, apply pressure to the actuator to fully stroke it open. This will raise the plug off
its seat so that the valve stem serrations are visible inside the flow adjuster window (see figure 9). Loosen the socket
head screws (key 29) and lower the flow adjuster (key 14 and 15) to its lowest position on the valve stem. Retighten
the socket head screws (key 29) to 3 NSm (26 lbfSin). Relieve pressure to the actuator, shut off all pressure lines to
actuator, and disconnect. Use lockout procedures to be sure that the above measures stay in effect while you work
on the equipment.
CAUTION
The preceding step is intended to prevent damage to the valve plug (key 3) and seat ring (key 5) during the removal of the
bonnet and actuator.
3. Unscrew the bonnet from the valve body.
WARNING
Avoid personal injury from sudden release of process pressure. If the process media starts to escape from the safety vent
(see figure 2) located in the bonnet neck of the valve body,
STOP DISASSEMBLY IMMEDIATELY!
The escape of process media indicates that the valve has NOT been isolated from the process media, or process pressure is
trapped in the valve body.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
4. Once the bonnet has been removed from the valve body, inspect the valve seat (key 5) for wear or damage. If the
seating surface has been damaged, remove it from the valve body. Also remove the seat ring gasket (key 6). Clean
D2 FloPro Valve
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