(under subclass 26) Devices intended to prevent the bursting of the pipe when the fluid therein freezes by providing an air pocket or other chamber into which the fluid can flow when it expands.
SEE OR SEARCH CLASS
123, Internal-Combustion Engines,
41.5, for similar devices tied up with the structure of an internal combustion engine cooling system.
137, Fluid Handling,
59+, for fluid handling system including safety devices responsive to freeze conditions, subclasses 301+ for hydrants having means for preventing freezing, subclasses 334+ for fluid handling devices including heating means to prevent freezing, subclass 375 for jacketed or insulated fluid handling apparatus and subclass 593 for fluid distribution systems provided with expansion chambers.
