Description
Class F04F : PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED
Subclass 1/12: Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped (using only negative pressure F04F 3/00; jet pumps F04F 5/00; siphons F04F 10/00) the fluid medium acting on the surface of the liquid to be pumped (F04F 1/02 takes precedence) of multiple type, e.g. with two or more units in parallel (F04F 1/08 takes precedence) in series