| http://www.w3.org/ns/prov#value | - The drive is by means of compressed air acting directly upon the diaphragm Another possibility is hydraulic driven instead of compressed air At least 2 valves, one on the suction and one on the discharge side are always necessary Several types of valves are used in a air operated diaphragm pumps - they are flap, cylindrical and ball valves No seal ??? no leakages
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