(under subclass 118) Subject matter wherein the restricting means is of a form such that the fluid flow direction is changed at least twice in a plurality of stages.
(1) Note. Typical of the restrictors to be found in this subclass are (1) restrictors comprising a plurality of baffle plates so arranged that the fluid flowing past them eddies or reverses its flow and (2) restrictors comprising a passage which is reversed back on itself a plurality of times to produce a number of reversals of flow greater than two.
SEE OR SEARCH CLASS
137, Fluid Handling,
573, and 574 for plural series flow related tanks or compartments formed by baffles and/or providing for zigzag flow.
138, Pipes and Tubular Conduits, 42+, for pipes with flow restrictors in the form of a tortuous path.
