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Instruction Manual
D104297X012
Valve Assembly
Be sure to replace valve parts in the same position and orientation from which they were removed. Use the following
steps to reassemble the valve.
Note
Clean and protect all sealing surfaces from damage while installing parts. Lubricate components when necessary as an aid for
installation, and to help protect sealing surfaces.
Refer to figures 4, 5, and 6 that identify the V270 valve components by key number.
During assembly, visually inspect component surfaces that interface with an o-ring or seal for any damage that may
prevent proper sealing.
1. Place both tailpieces (key 2), flange end down on a clean soft surface with the seal assembly cavity facing up. Use
caution to protect the flange end serrated surfaces.
2. Lubricate the tailpiece counterbores where the seal will insert and inject lubricant into each of the spring holes.
Install the seal springs (key 18).
3. On both seals (key 5), install the o-ring (key 15) and backup ring (key 16) in the correct orientation (see figures 5
and 6).
4. Lubricate the seal o-rings and insert the seal assembly into the tailpiece counterbores. Maintain axial alignment of
the two components as the seal assembly is pushed into place.
5. Lubricate and install the o‐rings (key 13) in both tailpieces.
a. For NPS 6 through NPS 12 constructions, one o-ring per tailpiece is required.
b. For NPS 14 through NPS 24 constructions, two o-rings per tailpiece are required.
6. Place the body (key 1) on an appropriate work surface.
7. If studs (keys 19 and 20) were removed from valve body during disassembly, apply anti-seize lubricant (Key 47) to
threaded stud holes. Apply anti-seize lubricant to the long studs (key 20), which are used to attach the base
brackets (key 25). Install the long studs first in the stud hole locations marked during disassembly. (Note: Base
brackets are not available for the NPS6 CL150 and NPS6 CL300 valve constructions.) Apply anti-seize compound to
the balance of studs (key 19) and install in the body.
8. Lubricate the tailpiece o-ring gland of the body and lower the tailpiece into place, guiding the male o-ring gland of
the tailpiece within the female gland of the body. Take special care to prevent pinching of the o-ring. The tailpiece
must be oriented such that, the bearing plate dowel pin holes are in alignment and parallel with the body shaft bore
axis. Refer to figure 4 and note the tailpiece (key 2) orientation in relation to the body (key 1), bearing plates (key
11), and dowel pins (key 22).
9. Apply anti-seize lubricant compound to the face and threads of the heavy hex nuts (key 21). If applicable, place the
base bracket (key 25) over the long studs. Install the heavy hex nuts on the studs by hand with the material
identifier facing outwards. Use an appropriate torque device to apply the final torque specification (see table 3).
10. Lift and orient the assembly so the raised face of the tailpiece end connection flange is sitting on a clean, soft
surface. Take special care to prevent damage to the raised face serrated surface. Install the bearing plate dowel pins
(key 22) in the tailpiece. (Note: The dowel pins are not applicable to the NPS6 CL150, as this construction does not
incorporate bearing plates.)
11. If necessary, install new bushings (key 12) in the bearing plates (key 11) by driving out the old and pressing in the
new.
V270 Valve
September 2018
11
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