US PATENT SUBCLASS 137 / 455
LINE CONDITION CHANGE RESPONSIVE VALVES

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456  DF  .~> Safety cut-off requiring reset {7}
467  DF  .~> Fluid opened valve requiring reset
467.5  DF  .~> Consistency responsive
468  DF  .~> Thermal responsive
469  DF  .~> Pop valves {5}
479  DF  .~> Combustion engine induction type {5}
484.2  DF  .~> Line flow effect assisted {2}
485  DF  .~> Pilot or servo controlled {3}
493  DF  .~> Bi-directional flow valves {4}
494  DF  .~> With separate connected fluid reactor surface {8}
511  DF  .~> Direct response valves (i.e., check valve type) {14}

DEFINITION

Classification: 137/455

(under the class definition) Apparatus in which a valve is controlled in response to a change in the fluid condition, occurring within the system or line including the valve, which change has not been effected by external means for the express purpose of controlling the operation of the valve.

(1) Note. The ultimate function of these devices is to control the flow by its own characteristics. Where the ultimate purpose of the system goes beyond this field, classification is in the subclass appropriate to the system, even though one or more line condition change responsive

valves are included in it. For example, a closed circulating distribution system is classified in subclasses 563+ even if it has check valves in one of more flow passages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38+, for gravity or inertia operated flow controllers.

47+, for speed responsive valve control, and see the search notes to subclass 47.

59+, for freeze condition responsive valves. 67+, for fusible, frangible or soluble flow controllers.

78+, for atmospheric condition change responsive valves.

154+, for condition change responsive valves in diverse fluid containing pressure systems.

220, for condition responsive valves of the large streamlined co-axial needle type used in hydraulic engineering, i.e., Larner-Johnson.

386+, for liquid level responsive or maintaining systems.

SEE OR SEARCH CLASS

181, Acoustics,

212, and 237 for general fluid conducting and pressure relief valves.

222, Dispensing,

491+, for dispenser outlet valves operated by pressure of the material, and see the search notes thereto.

251, Valves and Valve Actuation,

15+, for flush type valves the closing of which is delayed by means of a pressure chamber in the line, and subclasses 25+ for fluid pressure pilot or servo operation of a valve.