(under the class definition) Apparatus which includes means which senses the existence of conditions which would cause the freezing of liquid within the system and in response thereto exercises a control to protect the liquid from freezing or to safeguard the system as a whole from the effects of freezing of a part thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72+, for valves controlled by heat destructible or fusible means.
79+, for devices responsive to atmospheric temperature not amounting to a freeze condition.
107, for apparatus wherein a waste valve opens in response to the stopping of flow through the line, disclosed as preventing freezing.
118.01+, for branched flow systems responsive to temperature of the system.
301+, for hydrants with means to prevent freezing. 457, for safety cut-offs requiring reset and responsive to thermal conditions in a fluid line.
468, for other valves controlled in response to thermal conditions in a fluid line.
SEE OR SEARCH CLASS
62, Refrigeration,
132+, for condition sensing controls for a refrigeration system, particularly subclasses 139+ for control by accumulation on a freezing surface.
123, Internal-Combustion Engines,
41.14, 41.15, 41.42, 41.5, and 142.5 for devices for protecting the cooling systems of internal combustion engines against cold.
138, Pipes and Tubular Conduits,
27+, for freeze protecting pressure compensators, and subclasses 32+ for freeze protection for pipes and tubular conduits.
236, Automatic Temperature and Humidity Regulation, appropriate subclasses.
237, Heating Systems, 80, for heating radiators having means for preventing freezing.
