137 / | HD | FLUID HANDLING |
315 | DF | WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6} |
329 | DF | .~ With provision of alternate wear parts {1} |
329.01 | .~.~ Valve heads and/or seats {3} | |
329.02 | DF | .~.~.~> Opposite duplicate surfaces of unitary structure {1} |
329.05 | DF | .~.~.~> Different portions of continuous surfaces |
329.06 | DF | .~.~.~> Successively used adjacent independent elements |