Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped (using only negative pressure F04F3/00; jet pumps F04F5/00; siphons F04F10/00)

Child Classifications

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• F04F 1/02 using both positively and negatively pressurised fluid medium, e.g. alternating
• F04F 1/06 the fluid medium acting on the surface of the liquid to be pumped (F04F1/02 takes precedence)
• F04F 1/18 the fluid medium being mixed with, or generated from the liquid to be pumped