IMO
2/19
6
IMO-R26 EN
6.4
Body
Sealing and functional surfaces are shown in
Figures 5 and 6.
Visually inspect body seal, packing, and thrust bearing seal
areas for damage.
Visually inspect seat sealing area per
Section 6.4.1
and
Figure 6
.
If equipped with phono-grooves, visually inspect them for
damage.
If insert threads into body, visually inspect the threads for
damage. Dry fit the insert into the body threads to check fit.
Where a seal is used between the valve body and the tank
car, visually inspect the sealing surface between the valve
and tank car for damage.
Visually inspect thrust bearing area for wear or galling.
If equipped with threaded holes, visually inspect them for
damage.
If the body has threaded fasteners, gage the threads for
damage. Replace any fastener where the threads are
damaged, or have been heated, stretched or corroded.
Figure 5: Typical Body Sealing and Functional Areas
See Figure 6
LEGEND: Seal Surface (Solid Line) Functional Surface
6.4.1 Seat to Body Sealing Area
The seat seal against the body occurs at the transition of
the angle on the back of the seat (see
Figure 6
). This band
of continuous sealing area and must meet the sealing area
criteria. The location of the sealing band varies for each ball
valve model, size and seat material. Dimensions for each
Jamesbury
Tank Car Ball valve are provided in
Table 1
.
The repair facility must use their own judgement and
experience when evaluating damage severity in sealing
areas. Metso recommends that all repairs be confirmed by
gas testing each rebuilt valve for shell and seat leakage.
