(under subclass 412) Feed heaters located in the steam space of a boiler and consisting of plates or receptacles superimposed in such a way that the feed water falls from one to the other. The heater may or may not have means for trapping the sediment and blowing it out of the boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
435+, 438 and 443, for other pan or tray structures used in feed heater structures.
SEE OR SEARCH CLASS
210, Liquid Purification or Separation,
198.1+, for separating means with means to add a treating material, e.g., steam.
261, Gas and Liquid Contact Apparatus, for structure of plates and receptacles in Gas and Liquid Contact Apparatus of general utility.
