(under subclass 455) Apparatus within ... in which a valve is controlled in response to a change in the thermal condition of the fluid within the apparatus.
(1) Note. This subclass includes devices which sense changes in thermal conditions of the fluid and exercise a compensating effect so as to neutralize any effect the change in thermal condition of the fluid would otherwise have on the operation of the device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6, for processes of mixing controlled by heat of combustion of the mixture.
59+, for freeze condition responsive controls.
65+, for fuel safety cut-offs responsive to combustion failure.
72+, for similar apparatus which includes a heat fusible or destructible element for sensing the thermal condition. 79+, for valves controlled in response to variations in atmospheric temperature.
90, 118 and other appropriate subclasses of this group for self-proportioning systems having temperature responsive or maintaining aspects.
334+, for systems involving heating, heat exchange and cooling, and see the search notes to subclass 334.
457, for safety cut-off valves which respond to temperature changes in the line and require external reset.
SEE OR SEARCH CLASS
236, Automatic Temperature and Humidity Regulation, appropriate subclasses for thermally controlled valves, per se, especially
53, 60 for temperature responsive liquid separating traps.
