US PATENT SUBCLASS 122 / 69
.~.~.~.~.~ Check-valved

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
58 R  DF  .~.~ Drop water firebox {11}
68  DF  .~.~.~ Water tube {3}
*  DD  .~.~.~.~ Feed heater {1}
69.~.~.~.~.~ Check-valved

DEFINITION

Classification: 122/69

(under subclass 68) Devices with check valves so arranged that water from the boiler circulates through the chambers, conduits or tubes until feed water is being fed thereto, when the boiler circulation is cut off.

SEE OR SEARCH THIS CLASS, SUBCLASS:

118, for similar art.

196, for check valved feed heaters for horizontal cylindrical boilers.