Instruction Manual
D104707X012
WhisperTube
August 2021
6
Follow steps 14-20 for the two-piece body construction (NPS 8-12)
14. Install the wave spring (key 4) in the groove at the flange end of the inlet body half.
15. Assembly is easiest if the parts are oriented vertically. Place the inlet body half flange end down on a clean soft
surface. Use caution to protect the flange end serrated surfaces.
16. Install the perforated screen tube in the inlet body half until it contacts the wave spring.
17. Center the spiral wound gasket (key 12) on the inlet body flange serrated surface.
18. Lower the outlet body half over the screen. Ensure the drain pipe plugs and the threaded lifting lugs are aligned and
located on the same side of the body in both the inlet and outlet halves.
19. Apply anti-seize lubricant compound to the face and threads of the hex nuts and to the threads of the studs. Install
the nuts and studs. Use an appropriate torque device to apply the final torque specification (see table 4). Tighten
nuts in a star pattern to ensure the spiral wound gasket is compressed evenly.
Table 4. Body Flange Torque Specifications
VALVE SIZE, NPS
PRESSURE CLASS
STUD MATERIAL
STUD SIZE
TORQUE
(ft•lbs)
8
150, 300
B7M
1 1/8” – 8 x 6.75”
525
600
1 1/4” – 8 x 8.75”
695
10
150, 300
1 1/4” – 8 x 7.50”
695
600
1 1/2” – 8 x 10.00”
1220
12
150, 300
1 1/4” – 8 x 7.70”
695
600
1 5/8” – 8 x 10.75”
1570
