(under subclass 231) Subject matter wherein the lever is so arranged that its effective length varies as the lever swings through its actuating range, to vary the relation between effective force and the resistance of the actuated valve at various stages of its movement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237+, for levers having sliding contact wherein there is no appreciable mechanical advantage obtained by the sliding contact.
SEE OR SEARCH CLASS
137, Fluid Handling,
531, for valves having direct response to condition change in which a reciprocating valve has a variable lever arm biasing means.
