| 251 / | HD | VALVES AND VALVE ACTUATION |
| 89 | DF | WITH MEANS FOR BLOCKING OR DISABLING ACTUATOR {6} |
| 101 | DF | .~ Latch manipulator mounted on handle or stem {3} |
| 102 | | .~.~ Constrained linear motion {3} |
| 103 | DF | .~.~.~> With pivoted latch |
| 104 | DF | .~.~.~> With latch rigidly associated with manipulator {1} |
| 106 | DF | .~.~.~> With transversely movable latch |