(under subclass 336) Subject matter wherein the biasing means is a member of sufficient mass to maintain the valve in the desired position by gravity response.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72, for weight biased trip actuated valve.
76, for impact type actuators for valves.
SEE OR SEARCH CLASS
137, Fluid Handling,
38+, for control of change of position or inertia of the system, especially subclasses 45+ for control by pendulum or swinging member, subclasses 403+ for liquid level responsive devices responding to weight of accumulated fluid, and see the search notes to subclasses 403 and 408, subclasses 419 and 421 for weight actuators in quick acting float control valves and subclasses 519+ and 532+ for weight biased valves directly responding to line condition change.
