(under subclass 8) Structures including (1) means responsive to some condition of the fluid (for example, temperature, pressure or flow) to operate some device (for example, valves, switches or indicators), (2) also all combinations with signaling or indicating means, including liquid level gauges.
(1) Note. Fluid pressure operated valves are included.
(2) Note. This subclass does not include mere expansion and contraction devices which compensate for changes in volume of the fluid, unless associated with fluid controlled or indicating means. Such expansion and contraction devices are elsewhere in this class.
(3) Note. For signaling means and means responsive to a condition of a fluid, and not limited to combination with subject matter of this class (174), see the appropriate class, the following in Search Class, below, being particularly noted.
SEE OR SEARCH CLASS
73, Measuring and Testing,
40+, for means for detecting leaks in electrical apparatus utilizing fluids where the structural characteristics of the electrical apparatus are not claimed. 116, Signals and Indicators. (See Note (3), above.)
137, Fluid Handling, particularly
455+, and 551+. (See Note (3), above.)
138, Pipes and Tubular Conduits, particularly
26+,. (See Note (3), above.)
220, Receptacles, particularly
721+,. (See Note (3), above.)
236, Automatic Temperature and Humidity Regulation. (See Note (3), above.)
313, Electric Lamp and Discharge Devices,
13, for electric lamps and discharge devices with nonelectrical means for controlling the temperature modifying medium used with the lamp or discharge device.
315, Electric Lamp and Discharge Devices: Systems, 112+, for electric lamps and discharge devices with electrical means for controlling the temperature modifying medium used with the lamp or discharge device.
577+, 584+, 603+, and 635+. (See Note (3), above.)
361, Electricity: Electrical Systems and Devices,
14, for miscellaneous electrical systems having fluid condition response means for controlling the system for safety purposes (e.g. opening supply circuit if cooling medium is not effective).
