Top Entry Trunnion Mounted Cryogenic Ball Valves – C52
Valves Series
Top Entry Trunnion Mounted Cryogenic Ball Valves – C52
Valves
Series
16
3.18.
Tighten the stem nut onto the stem according to table 2 and lock the locking clip or the tab lock washer.
Table 2:
Valve Size
Stem Size
Stem Thread
HERMETIX
Nm
Lb-in
1/2” (DN15)
1”
7/16” - 20 UNF
11
97
3/4”-1” (DN20-DN25)
1 1/2”
9/16” - 18 UNF
15
133
1 1/2” (DN40)
2 1/2"
M20x2.5
30
265
2" (DN50)
3"
1” – 14 UNS
60
530
2 1/2”-3"-4" (DN65-DN80-DN100)
6"
1 1/2” – 12 UNF
120
1060
6” (DN150)
10”
2" – 8 UN
300
2655
Important: An excessively tightened stem nut can cause excessive packing wear and
increase stem torque.
3.19.
Insert the stem bearing inside the bottom flange of the bonnet.
3.20.
Place the bonnet onto the body, coupling the stem slot with the ball drive and aligning the "S" on
the bonnet with the body seat side (also marked with "S").
3.21.
Ensure that the bolt holes in the bonnet align with the threads in the body.
Slightly push the bonnet
down to seat it onto the body,
taking care not to score faces or damage seals
.
Important: Prior to assembly, determine the correct orientation of the stem slot
with respect to the "S" mark on the bonnet.
