Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS

Subclass:

POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS

Child Classifications

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• F04B 49/02 Stopping, starting, unloading or idling control
• F04B 49/04 Regulating by means of floats
• F04B 49/06 Control using electricity
• F04B 49/08 Regulating by delivery pressure
• F04B 49/1 Other safety measures
• F04B 49/12 by varying the length of stroke of the working members
• F04B 49/16 by adjusting the capacity of dead spaces of working chambers
• F04B 49/18 by changing the effective cross-section of the working surface of the piston
• F04B 49/2 by changing the driving speed
• F04B 49/22 by means of valves