(under the class definition) Apparatus comprising a member in the working fluid* flow conduit which member guides or regulated the flow of working fluid* and is movable from a first position towards a second position by a force caused by the flow of working fluid* acting against the member and is biased or otherwise urged towards it first position when the working fluid* stops flowing or the direction of its flow reverses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2.1+, for a device with means for controlling casing* or flow guiding means in response to natural fluid current force or direction (i.e., water or wind current).
SEE OR SEARCH CLASS
137, Fluid Handling,
455+, for line condition responsive valves and particularly subclasses 511+ for other check type or return flow preventing valves.
