8
IMO-227 EN
IMO 8/17
2. With a wire brush, clean studs (29) and stud nuts (30)
of foreign material, such as paint, thread locker, grime
and commodity. Inspect the threads for damage or
defects with appropriate ring or plug gauge. Repair
any out-of-tolerance threads, or replace in-kind. Check
that nut can be run up and down entire usable portion
of the threads. See (Figure 19).
3. Re-inspect all components for damage before reas-
sembling the valve. Look for damage to the seating
areas, stem, body and insert; and look for wear in the
bearing areas. Replace any damaged parts.
4. Carefully clean and polish the ball (3) sealing surface: It
should be free of all scratches and grooves.
5. If the ball is slightly damaged, it may be possible to
smooth the sealing surface with crocus cloth or equiv-
alent. If deep scratches are present, replace the ball.
6. With the body insert side facing up, slide one valve seat
(5) sideways into the body (1) to below the stem bore,
and tilt it into place so that the proper surface (see
Figure 7) will be adjacent to the ball (3), being careful
not to cut or scratch the seat.
Figure 7 Proper Seat and Ball Orientation
7. From inside the body (1), insert the one thrust bearing
(13), the secondary stem seal (7), and the second thrust
bearings (13) into the stem bore (see Figure 8).
8. Insert the stem (4) through the insert end of the body
(1), being careful not to scratch the stem sealing sur-
face; and press it gently up into the stem bore until
resistance is felt from the thrust bearing. Holding the
stem in place from the bottom and insert the stem seals
(8) (see Figure 9) for proper v-ring orientation), over the
stem (4).
Figure 8 Thrust Bearing Orientations
Figure 9 Stem Seal Orientation
9. Place compression plate (20) overstuds (29). Place two
disc springs (31) over each stud (see Figure 10) for
proper orientation).
10. A lubricant compatible with the flow media MUST be
applied to the stud (29) threads and the face of the
stud nut (30). Place a stud nut (30) on each stud (29)
and tighten nuts alternately so that the compression
plate (20) remains parallel with the body bonnet.
Tighten the stud nuts in accordance with the torque
values in Table 1.
TABLE 1
Bonnet Stud Nut Torque (Standard Valve)
Size
Series
V-RING STEM SEALS GRAPHITE STEM SEALS
ft·lbs in·lbs
N·m
ft·lbs in·lbs
N·m
3
7150/7180
4
48
5.4
8
96
11
3
7300/7380
4
48
5.4
8
96
11
3
730S/738S
4
48
5.4
8
96
11
4
7150/7180
4
48
5.4
8
96
11
4
7300/7380
8
96
11
18
216
24.5
4
730S/738S
8
96
11
18
216
24.5
6
7150/7180
8
96
11
18
216
24.5
6
7300/7380
11
132
15
24
288
32.5
6
730S/738S
11
132
15
24
288
32.5
11. Screw the insert (2) into the body until it is fully down,
and then mark its position as shown in the left view of
(Figure 11). Counting the number of turns, remove the
insert.
Stem must be centered
in ball slot as shown at
assembly
Seats must be in this
position at assembly
®
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