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Instruction Manual
D104727X012
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.
WARNING
When lifting the ball, ensure the bearing plates (key 11) are secure on the ball trunnions to prevent parts from falling which
may cause personal injury or property damage.
12. Use an approved lifting sling through the ball bore to lift the ball (key 3).
a. Lubricate and install the thrust washers (key 17) and bearing plates on both ball trunnions.
b. Install the ball and bearing plate assembly into the body.
c. Guarantee the dowel pins (key 22) in the lower tailpiece have engaged the holes in the bearing plates and that
the ball shaft interface geometry is aligned with the body shaft bore.
d. Note: Specific to the NPS 6 CL150 construction, lubricate and place the follower end thrust washer (key 17) in the
follower end bore of the ball then lubricate and press in the follower end bushing (key 12) prior to installing the
ball assembly into the body. See figure 6.
13. Insert the upper bearing plate dowel pins (key 22) into the intended holes and install the upper studs, tailpiece,
base bracket, and heavy hex nuts per steps 7 through 10.
14. Insert the drive shaft (key 4) into the body shaft bore and engage the ball interface geometry. Slide the shaft thrust
washer (key 9) into place.
15. Install the drive shaft bushing (key 8) in the packing box from the end that engages the body. Lubricate and install
the O-ring (key 14) in the packing box housing.
16. After lubricating the body shaft bore and thrust washer (key 9), position the packing box housing assembly over the
drive shaft and slide into place ensuring the O-ring (key 14) properly engages the body shaft bore. For DSV1000
constructions other than the NPS6 CL150, skip to step 18.
DSV1000 Valve
June 2022
11
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