(under the class definition) Devices, in the pipe line, attached thereto, or adapted to be attached thereto, for allowing expansion of the conducted fluid upon change in
temperature, for receiving and delivering energy from and to the conducted fluid to maintain a more nearly constant pressure of the fluid and for dampening pulsations in pressure caused by a quick-shutoff of flow or by the nonuniform action of a pump.
SEE OR SEARCH CLASS
73, Measuring and Testing,
277, for such devices tied up with the structure of a water meter or its casing, and subclasses 700+, where tied up with pressure gauges.
181, Acoustics,
212+, for similar structures in mufflers and sound filters. 417, Pumps,
540+, for such devices in combination with a significantly claimed pump.
