F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
F04B45/053—Pumps having fluid drive
F04B45/0536—Pumps having fluid drive the actuating fluid being controlled by one or more valves