Emerson Fisher CCV-N, Instruction Manual

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Instruction Manual
D104191X012
CCV-N Valve
October 2018
9
5. Mark the orientation between valve body (key 1, figures 6, 7, 8, 12, and 13) and seat ring retainer (key 3, figure
figures 6, 7, 8, 12, and 13). Remove the seat ring retainer, valve plug and stem assembly, and associated gaskets
(key 10, 12, figures 6, 7, 8, 12, and 13).
6. Separate the plug stem assembly and seat ring retainer (key 3, figures 6, 7, 8, 12, and 13) by sliding the plug stem
assembly through the bottom of seat ring retainer.
7. Remove the seat ring (key 9, figure figures 6, 7, 8, 12, and 13) and seat ring gasket (key 13, figures 6, 7, 8, 12, and
13).
8. For all constructions, inspect parts for wear or damage which would prevent proper operation of the valve. Replace
or repair trim parts according to the following procedure for plug maintenance procedure.
NPS 4 Balanced Bore-Seal Trim Maintenance
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
1. Remove the actuator and the bonnet according to steps 1 through 6 of the Replacing Packing procedure in the
Maintenance section.
WARNING
To avoid personal injury due to leaking fluid, avoid damaging gasket sealing surfaces. The surface finish of the valve stem
(key 7, figure 14) is critical for making a good packing seal. The inside surface of the seat ring retainer (key 3, figure 14) is
critical for smooth operation of the valve plug. The seating surfaces of the valve plug (key 2, figure 14) and seat ring (key 9,
figure 14) are critical for proper shutoff. Unless inspection reveals otherwise, assume all these parts are in good condition
and protect them accordingly.
2. Remove the packing flange nuts, packing flange, and packing follower (keys 3, 5, and 13, figure 4). For Enviro-Seal
packing, remove the packing flange nuts, packing flange and spring pack assembly (key 201, 212 and 217, figure 5).
Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or other
tool that will not scratch the packing box wall. Clean the packing box and the metal packing parts.
3. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.
Scratches or burrs could cause packing box leakage or damage to the new packing. If the surface condition cannot
be improved by light sanding, replace the damaged parts.
4. On a CCV-N design with bonnet spacer, remove the bonnet spacer (key 32, figure 14) and associated gaskets (key
10 and 12, figure 14) without rotating the seat ring retainer (key 3, figure 14).
5. Mark the orientation between valve body (key 1, figure 14), and seat ring retainer (key 3, figure 14).
6. Gently pull the valve stem (key 7, figure 14) up to lift the whole valve plug and stem assembly, seat ring retainer,
Bore-seal and piston rings set (key 2, 4, 7, 8, 17, 18, figure 14) out of valve body (key 1 in figure 14). The plug stem
assembly contains sensitive guiding and sealing surfaces on its outside diameter and care must be taken in its
handling.
7. Locate the break between sections of the piston rings (key 18, figure 14), which should be out of seat ring retainer
by holding the valve stem and seat ring retainer. Using an appropriate tool such as a flat‐blade screwdriver, carefully
pry out the piston rings from the grooves in the Bore Seal retainer.
8. By holding both valve stem and seat ring retainer, place the whole valve plug and stem assembly, seat ring retainer,
Bore-seal trim set on a soft surface such as clean cloth, which will not damage the trim. The valve plug and stem
assembly, seat ring retainer and Bore-seal will remain as a whole trim set. Do not rotate the valve plug and stem
assembly within seat ring retainer. Do not apply any axial force into valve stem which might damage the Bore-seal.