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This invention relates to an apparatus particularly adapted for pumping liquid air or other liquids having relatively low boiling points. It is desirable in handling such liquids that the moving parts be simplified and reduced in number as much as possible, as effective lubrication is very difficult in such mechanism on account of the extreme low temperature of the liquid. It is the object of my invention to provide a pumping apparatus in which the pumping action is produced by vapor pressure in a closed pumping chamber. A further object is to provide an apparatus in which the vapor is produced by evaporation of a portion of the liquid being handled and in which such evaporation is preferably utilized for cooling the walls of a combustion chamber in which high temperatures are developed. My invention also relates to an improved method of pumping a low temperature liquid by utilizing vapor pressure developed by evaporation of a portion of the same liquid.
- Robert Goddard
pumping low temperature liquids, pumping apparatus, pumping apparatus and vapor pressure,
Goddard, Robert, "Apparatus for Pumping Low-Temperature Liquids" (1932). WPI Patents Collection. 33.