US PATENT SUBCLASS 122 / 196
.~.~.~ Check-valved

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

*  DD  HORIZONTAL CYLINDER {6}
195  DF  .~ Water tube {7}
*  DD  .~.~ Feed heater {1}
196.~.~.~ Check-valved

DEFINITION

Classification: 122/196

(under subclass 195) Devices through which the boiler water circulates and is heated, with check valves so arranged that the feed water when introduced flows through the tubes and is heated therein and is not permitted to enter the boiler directly.

SEE OR SEARCH THIS CLASS, SUBCLASS:

69, for a similar arrangement of valves.