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Install four (4) extra 5/8”-11 UNC 2A 1-3/4” long cap screws (item 9)
without
Locktite
.
TIP:
Use a 5/8” wrench to tighten the cap screws (item 9).
Figure 4-31 Install Cap Screws
Tighten the eight (8) cap screws (item 9) in a crisscross sequence until the
cap plate contacts the valve body (item 4).
NOTICE:
Tighten the cap screws (item 9) to 130 ft-lbs.
Figure 4-32 Tighten Cap Screws
Use a 0.002-inch feeler gauge to confirm that the cap is in contact with the
valve body (item 4) all around,
with no gaps allowed
.
NOTICE:
Cap-Bolt Torqe
. If uniform cap-to-body contact is not
achieved, increase the torque on the cap bolts in 10 ft-lb increments until
it is, but do not exceed a maximum of 250 ft-lb.
Figure 4-33 Check Cap-to-Body
Contacts
Attach the updated valve nameplate to the cap. It must be oriented upside-down (with respect to the valve
position in these photos) so that it will read properly when the valve is inverted and mounted on the tank car.
Use an applicable valve handle (two-feet long) to fully close the ball valve [with the stem stop plate (item 8)
contacting the stop pin (item 7)].
9
A-520/A-522/A-522A
, Rev. 3.0
