Emerson Fisher NPS 2 CCV-N Instruction Manual page 13

Instruction Manual
D104191X012
5. For NPS 2 and 3 balanced design, carefully insert the bottom end of plug stem seal assembly into the top of the seat
ring retainer (key 3) through the inner bore as shown in figure 10. Make sure there is no damage done to the seals.
Slide the plug stem seal assembly into the seat ring retainer (key 3) until the top of the plug stem seal assembly is
even with the top of the seat ring retainer (key 3). At this point, the plug (key 2) should have a snug fit with the seal
ring retainer (key 3).
For NPS 2 and 3 unbalanced design, carefully insert the bottom end of plug stem assembly into the top of the seat
ring retainer (key 3) through the inner bore. Make sure there is no damage done to the seals. Slide the plug stem
assembly into the seat ring retainer (key 3) until the top of the plug stem seal assembly is even with the top of the
seat ring retainer (key 3).
For NPS 4 balanced design, except Bore-seal trim, carefully insert the top end of the plug stem seal assembly into
the bottom of the seat ring retainer (key 3) through the inner bore. Ensure no damage is done to the seals, as shown
in figure 11. Slide the plug stem seal assembly into the seat ring retainer (key 3) until the top of the plug stem seal
assembly is even with the top of the seat ring retainer (key 3). At this point, the plug (key 2) should have a snug fit
with the seat ring retainer (key 3).
For NPS 4 balanced design Bore-seal trim, the valve plug, stem, plug retainer, Bore-seal, piston rings assembly is in a
whole trim set with seat ring retainer, which is ready for step 6. See the NPS 4 Balanced Bore-seal Valve Plug
Maintenance section.
6. Hold on to the end of the stem (key 7) and seat ring retainer (key 3) and slowly insert them into the valve body
(key 1), as shown in figures 6, 7, 8, 12, 13, and 14. Be cautious and do not swing the assemblies, as the seat ring
retainer (key 3) may fall off. At the same time, ensure that the seat ring retainer (key 3) bottom diameter is guided
properly to the seat ring (key 9) when installed into the valve body (key 1).
7. After the plug (key 2), stem (key 7, figure 3), and seat ring retainer (key 4) assembly is placed into valve body (key
1), ensure one of the seat ring retainer legs centerline aligns with the valve body inlet centerline and the previous
orientation mark between valve body (key 1, figures 6, 7, 8, 12, 13, and 14) and seat ring retainer (key 3, figures 6,
7, 8, 12, 13, and 14) aligns with each other. Once the seat ring retainer is oriented, gently push the plug seating
surface against the seat ring (key 9). Note the plug stem assembly is symmetrical, so no orientation is necessary.
For NPS 4 balanced design Bore-seal trim, do not try to push the valve plug, plug retainer, stem, Bore-seal and
piston rings assembly very hard into seat ring retainer Bore-seal sealing surface might require extra actuator force.
Wait until the valve stem is attached to actuator therefore the actuator could push the Bore-seal plug into Bore-seal
sealing surface.
8. Identify the spiral wound gasket (key 12) quantity per figures 6, 7, 8, 12, 13, and 14. Slide quantity 1 spiral wound
gasket (key 12) per figures 6, 7, and 8, or quantity 3 spiral wound gaskets (key 12, figures 12, 13, and 14) and
quantity1 flat sheet gasket (key 10) over the seat ring retainer (key 3). Make sure the bottom of the gasket is flush
with the mating surface on the seat ring retainer shoulder.
9. Coat the bonnet studs (key 15) with anti-seize lubricant (key 45) up to the deformed thread. Thread the studs into
the valve body (key 1) by hand until the deformed thread prevents further insertion.
10. If no bonnet spacer is required for the construction, skip this step and go to step 11. Slide the bonnet spacer
(key 32) onto the flat sheet gasket (key 10) over the seat ring retainer (key 3). Then, slide another flat sheet gasket
(key 10) onto the bonnet spacer (key 32) over the seat ring retainer (key 3).
11. Mount the bonnet on the valve body and complete the assembly according to steps 10 through 14 of the packing
replacement procedure.
12. Attach valve to actuator by securing the actuator yoke to valve bonnet with yoke locknut (key 15, figure 3, 4, or 5),
and connecting valve stem to actuator stem connector per actuator instruction manual. Make sure the actuator
stem and the valve stem are aligned with each other before connecting.
CCV-N Valve
October 2018
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