137 / | HD | FLUID HANDLING |
455 | DF | LINE CONDITION CHANGE RESPONSIVE VALVES {11} |
511 | DF | .~ Direct response valves (i.e., check valve type) {14} |
843 | DF | .~.~ Resilient material valve {4} |
852 | DF | .~.~.~ With valve member flexing about securement {4} |
855 | DF | .~.~.~.~ Flap or reed {3} |
857 | .~.~.~.~.~ With spring |