US PATENT SUBCLASS 122 / 406.1
CIRCULATION

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

406.1CIRCULATION {7}
406.2  DF  .~> Having anticavitation devices
406.3  DF  .~> Having restrictors and orifices
406.4  DF  .~> Once through
406.5  DF  .~> With start-up operations
407  DF  .~> Injector
408.1  DF  .~> Having internal conduit {2}
*  DD  .~> Mechanical {1}

DEFINITION

Classification: 122/406.1

CIRCULATION:

(under the class definition) Devices not otherwise classified comprising means for regulating the circulations of water in the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11, for rotary boilers.

36, and 407, for steam and water jets that help the circulation.

39, and 59, for horizontal fire tube boilers with a drop water firebox having a conduit located either outside or inside the boiler for aiding the circulation.

69, and 196, where the boiler circulation ceases through certain parts when feed water is fed to the boiler and the parts serve as a feed water heater.

83, for horizontal boilers with fire tubes having transverse diaphragms for assisting the circulation.

91, 118 and 159, for vertical fire tube and vertical flue boilers with internal tubes or sleeves for increasing the circulation. 123, for vertical fire tube boilers with transverse diaphragms.

202, for horizontal cylindrical boilers having a sediment trap through which the water circulates.

258, for boilers in which the circulation is downward through water tubes.

292, and 366, for absorbent wicks, within the boiler space.

379+, for circulation devices in combination with means for cleaning the boiler or purifying the water.

414, 415, 418, 419, 428+, 442, and 444, for circulation features combined with the heating and introduction of feed waters.

488, for combined separators for steam and circulation devices.

495, for circulation devices for protecting the crown sheet.

501, and 502, for displacing elements within water tubes.

SEE OR SEARCH CLASS

417, Pumps, appropriate subclasses for pumps, per se. 418, Rotary Expansible Chamber Devices, for rotary expansible chamber pumps, per se.