Instruction Manual
D104191X012
CCV-N Valve
October 2018
10
9. Remove the seat ring (key 9, figure 14) and seat ring gasket (key 13, figure 14).
10. 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 NPS 4 Bore-seal plug maintenance procedure.
Valve Plug Maintenance (Except NPS 4 Balanced Bore-seal Plug)
Except where indicated, NPS 2 key numbers are referenced in figure 6 or 12, NPS 3 key numbers are referenced in
figure 7 or 13, and NPS 4 key numbers are referenced in figure 8.
Note
Due to the design requirement of this product, the valve and stem are precision-matched and the stem is not replaceable. If
damaged, the valve plug and stem must be replaced as an assembly. Contact your
CAUTION
To avoid the valve plug seal ring (key 24) not sealing properly, be careful not to scratch the surfaces of the ring groove in
the valve plug or any of the surfaces of the replacement ring.
Do not remove the valve stem from the plug/retainer assembly unless you are planning to replace the valve stem. Never
reuse an old valve stem with a new plug or reinstall a valve stem after it has been removed. Replacing a valve stem requires
drilling a new pin hole in the stem. This drilling weakens the stem and damage may result in service.
1. With the valve plug (key 2) removed according to the Disassembly portion of the Trim Maintenance procedure,
proceed as appropriate:
2.
NPS 2 design for application up to and including 316
_
C (600
_
: Mark the orientation between valve plug
(key 2) and seal retainer (key 4). Punch out the pin (key 8) that connects the valve plug (key 2), stem (key 7) and seal
retainer (key 4). Remove the seal retainer (key 4) with a spanner wrench or strap wrench while counter-holding the
valve plug (key 2) with a second strap wrench, or other suitable tool, to prevent rotation of the valve plug on the
valve stem (key 7). Slide the upper anti-extrusion ring, seal ring, bi-directional back up ring, seal ring, and
anti-extrusion ring (key 63, 24, and 33) off the plug.
Inspect all parts for defects and cleanliness and replace the damaged parts. The removed seal set soft parts should
not be reused. To install the new seal parts, slide the lower anti-extrusion ring, seal ring, bi-directional back up ring,
seal ring, and upper anti-extrusion ring (key 63, 24, and 33) into the plug, as shown in figure 6. Apply anti-seize
lubricant (key 45) to the thread of the seal retainer and flat mating surfaces between the seal retainer and plug (key
2 and 4). Then, install the seal retainer (key 4) into the plug (key 2) and tighten it with a spanner wrench or strap
wrench until the pin holes and previous mark are aligned. Once the holes are aligned, secure the seal retainer (key
4) to the plug stem assembly with a new pin (key 8). Make sure the pin is inserted completely into the assembly with
0.025” depth from the radial surface.
CAUTION
To avoid damaging the seal ring, slowly and gently stretch it for the following procedure. Avoid jerking sharply on the ring.
NPS 3 design for application up to and including 316
_
C (600
_
F) (figure
Remove the retainer ring (key 26) off the
groove, and slide the back up ring, upper anti-extrusion ring, seal ring, bidirectional back up ring, seal ring, and
anti-extrusion ring (key 63, 24, 25, and 33) off the plug.
Inspect all parts for defects and cleanliness and replace the damaged parts. The removed seal set soft parts should
not be reused. To install the new seal parts, slide the lower anti-extrusion ring, seal ring, bi-directional back up ring,
