Flowserve McCANNA CryoSeal Ball Valves - Manual (Page 13)

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McCANNA CryoSeal ® Ball Valves FCD MMENIM2007-01-AQ – 04/15
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5. 14 Assemble plastic seat inserts into seal rings. Place a PTFE seat seal in the back of each seat. Lightly
lubricate ball sealing surface and seat sealing surfaces.
5. 15 Place seats in position on ball so that seats are aligned with the ball flow passage, with the ball slot
facing upwards. Holding ball and seats in position, lift as a unit and carefully lower into valve body,
lining up seat backs with body seat surfaces. Carefully align the ball stem slot so that it is perpen-
dicular to the body flow passage and the top flat of the ball is parallel to the bonnet flange.
5. 16 Lubricate bonnet fasteners (studs & nuts) per Table 1.
5. 17 Place a new bonnet gasket in the machined groove in the body. Place spring on ball, centered on
stem slot.
5. 18 Place bonnet assembly on body, aligning stem tang with spring and ball slot, and bonnet bolt holes
with body studs. Carefully press down on bonnet, making sure bonnet gasket register is properly
aligned with body bore. Spring resistance will be felt; this is normal. Continue pressing down, taking
care not to damage gasket, until studs extend through the bonnet enough to engage nuts. Holding
bonnet in place, thread nuts on to studs and tighten finger tight. Follow the bolt tightening sequence
(Figure 6).
Figure 6. Bolting Sequence
5. 19 Tighten bonnet bolting evenly to the torque values (Table 3) following the bolt tightening sequence
(Figure 6). Manually cycle valve several times to verify proper operation. Reinstall actuation (handle,
gear, or actuator). Testing before reinstallation is recommended.
Table 3 - Bonnet Bolting Torques
Torque (ft-lbs)
Regular Port Valve Size Full Port Valve Size Class 150/300 Class 600
1.5 0.5, 0.75, 1 40 65
2 1.5 95 95
3 2 195 195
4 3 345 345
6 4 345 445
8 6 665 795