| 137 / | HD | FLUID HANDLING |
| 455 | DF | LINE CONDITION CHANGE RESPONSIVE VALVES {11} |
| 511 | DF | .~ Direct response valves (i.e., check valve type) {14} |
| 528 | DF | .~.~ Reciprocating valves {5} |
| 532 | DF | .~.~.~ Weight biased {2} |
| 533 | DF | .~.~.~.~ Valve body is the weight {2} |
| 533.17 | | .~.~.~.~.~ Guided head {2} |
| 533.19 | DF | .~.~.~.~.~.~> Cage |
| 533.21 | DF | .~.~.~.~.~.~> Guide stem {5} |