1. A diaphragm pump uses a diaphragm to pump a fluid. 2. For larger scale extractions, diaphragm pumps are most common. 3. Diaphragm pumps can also be made which discharge at fairly high pressure.4. LEWA applied for a patent for the " sandwich diaphragm " for diaphragm pumps in 1968. 5. Slow diaphragm pumps use a large diaphragm operated by a cam or lever to generate suction with each stroke. 6. Fast diaphragm pumps use a diaphragm that is acted on by a lever, with thousands of cycles per minute. 7. Diaphragm pumps have a "'diaphragm "'through which repeated compression / decompression motion is transmitted.8. Diaphragm pumps have the advantage that they pump relatively lightly due to the lack of pulling rods and are corrosion resistant.9. Because this is usually complicated and costly, diaphragm pumps operating in poor rural areas are often abandoned once the diaphragm wears out. 10. In electric diaphragm pumps , the motor drives a hydraulic piston pump that transmits the oil displaced by the piston, to move the diaphragm.
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