137 / | HD | FLUID HANDLING |
315 | DF | WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6} |
329 | DF | .~ With provision of alternate wear parts {1} |
329.01 | DF | .~.~ Valve heads and/or seats {3} |
329.02 | DF | .~.~.~ Opposite duplicate surfaces of unitary structure {1} |
329.03 | DF | .~.~.~.~ Homogeneous material {1} |
329.04 | .~.~.~.~.~ Valve heads |