(under subclass 219) Flow control devices in which the valve is actuated in response to a change in condition of the fluid handled.
(1) Note. Such devices as pressure regulators and excess or reverse flow responsive valves, and combinations of the above with each other or with manual or other external controls, are included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
455+, for line condition responsive valves of other types, especially subclasses 485+ for pilot or servo-controlled condition change responsive valves.
