| 137 / | HD | FLUID HANDLING |
| 87.01 | DF | SELF-PROPORTIONING OR CORRELATING SYSTEMS {8} |
| 109 | DF | .~ Self-controlled branched flow systems {4} |
| 115.01 | DF | .~.~ Bypass or relief controlled by main line fluid condition {3} |
| 115.03 | DF | .~.~.~ Flow rate responsive {7} |
| 115.09 | | .~.~.~.~ Choke {1} |
| 115.1 | DF | .~.~.~.~.~> Variable choke resistance |