(under the class definition) Subject matter comprising means for variably restricting or entirely cutting off the flow of fluid through a passage.
(1) Note. The subject matter of this subclass relates to valves, per se, which were included in this class by analogy to the various special types specifically provided for. See the search notes below for a listing of such special types.
SEE OR SEARCH CLASS
137, Fluid Handling,
67+, for fusible, soluble and other destructible and deformable closures, subclasses 154+ especially subclasses 173+, 177+ and 197+ for discriminating valves for gas and liquid, subclasses 219+ for Larner-Johnson valves, subclasses 251+ for liquid valves, subclasses 309+ for reversing valves for regenerative furnaces, subclasses 386+, especially subclasses 409+ for float operated valves, subclasses 455+ for line condition change responsive valves, e.g., pop and other safety valves, check valves and safety cut-offs.
