Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps (by using positive or negative pressurised fluid medium acting directly on the liquid to be pumped F04F1/00)

Child Classifications

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• F04B 47/005
• F04B 47/02 the driving mechanisms being situated at ground level (F04B47/12 takes precedence)
• F04B 47/06 having motor-pump units situated at great depth
• F04B 47/12 having free plunger lifting the fluid to the surface
• F04B 47/14 Counterbalancing