251 / | HD | VALVES AND VALVE ACTUATION |
12 | DF | FLUID ACTUATED OR RETARDED {12} |
61 | DF | .~ Flexible wall expansible chamber reciprocating valve actuator {2} |
61.2 | .~.~ Coaxial actuator, seat and valve {3} | |
61.3 | DF | .~.~.~> Valve between coaxial spring biasing means and actuator |
61.4 | DF | .~.~.~> Coaxial spring biasing means between valve and actuator |
61.5 | DF | .~.~.~> Actuator wall between valve and coaxial spring biasing means |