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.
4.1.6 Sealing Surface (Valve Mounting)
4.1.6.1 On the underside of the valve body (item 4) is the surface that seals the valve to the
mounting plate on the railcar (Figure 4-8). Machining of this surface is permitted. A good
seating surface is necessary to ensure there are no leaks in this area.
Figure 4-8 Valve-Body Sealing Surface
NOTICE: Please refer to paragraph A4.11.2 of the Tank-Car Specifications and
consult Appendix E for dimensions and applicable tolerances.
NOTICE: Some valves do not include a tongue flange. On valves with a flat-face
mounting flange, refer to A4.11.2 of the Tank-Car Specification for machining
specifications
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