| 251 / | HD | VALVES AND VALVE ACTUATION |
| 213 | DF | MECHANICAL MOVEMENT ACTUATOR {10} |
| 231 | DF | .~ Lever {5} |
| 236 | DF | .~.~ Biased {3} |
| 237 | DF | .~.~.~ Sliding contact {1} |
| 238 | DF | .~.~.~.~ Spring {1} |
| 239 | | .~.~.~.~.~ Spring co-axial with valve arm {2} |
| 240 | DF | .~.~.~.~.~.~> Spring stop on valve stem |
| 241 | DF | .~.~.~.~.~.~> Spring abuts valve stem guide |