US PATENT SUBCLASS 137 / 613
.~ Flow path with serial valves and/or closures

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

561 R  DF  SYSTEMS {32}
613.~ Flow path with serial valves and/or closures {7}
614  DF  .~.~> Separable flow path section, valve or closure in each {4}
614.11  DF  .~.~> Common actuator {3}
614.16  DF  .~.~> One valve head provides seat for other head {1}
614.18  DF  .~.~> One valve head carries other valve head
614.19  DF  .~.~> Biased valve with external operator
614.2  DF  .~.~> Direct response normally closed valve limits direction of flow
614.21  DF  .~.~> Coaxial oppositely directed seats

DEFINITION

Classification: 137/613

(under subclass 561) Systems comprising a single flow path for a fluent material having two or more spaced valves, flow controllers or closures therein through which the fluent material passes serially.

(1) Note. A tank with claimed inlet and outlet, each with valve or closure, is here.

(2) Note. See the class definition, Lines With Other Classes and Within this Class, (2) Plural Valves, and Subclass References to the Current Class, for search notes on plural valves and their actuators.

SEE OR SEARCH THIS CLASS, SUBCLASS:

232, for tire stems with inflation check valve and cap.

247.17, for plural serial valves combined with liquid seal apparatus.

269, for serially arranged valves, flow controllers, or closures, wherein one of these is a removable closure which is entirely separated from the remaining structure in order that a flow section may be attached in place thereof. 285, 299 and 300, for hydrants including a main valve and a serially arranged supplemental valve.

391, for liquid level control of both inflow and outflow of a tank.

583+, for systems with plural openings, one of which is an access opening or a gas vent.

596+, for drain and stop and waste valves, and see the search notes thereto.

SEE OR SEARCH CLASS

222, Dispensing,

445+, and 450+ for measuring traps with valved inlets and outlets and subclasses 478+ for dispensing containers with plural openings.

251, Valves and Valve Actuation,

118, for a valve in series with a restrictor.