NOTICE: Repair work is limited to cleaning and polishing. See Paragraph A4.11.1 of
the Tank-Car Specifications.
WARNING: Machining Not Allowed. Machining, grinding, welding or other
alterations to the valve seat or stem seat is not allowed per AAR M1002, Paragraph
A4.11 of the Tank-Car Specifications.
4.1.1 Top Guide
4.1.1.1 The Top Guide (item 1) is principally a structural part. There should be no paint on the guide
bushing of this part where the valve stem enters it, or between adjacent surfaces of the top
guide and valve body. The area of discharge through the top guide (Figure 4-2) must be
unobstructed by foreign matter that would hinder free flow of discharging fluid.
Figure 4-2 Top-Guide Discharge Area
4.1.2 Valve Stem
4.1.2.1 Remove scale, residual product and other foreign material from the stem. Use magnetic-
particle or dye-penetration inspection to detect cracks.
Figure 4-3 Valve Stem
To Next Page
Loading...
