automatic diaphragm dosing pumps automatic stroke controller flow:0-500L/H, Pressure:0-10bar power:250W, 370W, 2ph or 3ph automatic diaphragm dosing ... 15 28 Features1.Very high safety of operation. Mechanical actuate diaphragm. Changeable eccentric drive2.Power off seal,no leakage,with ... the life span, the first layer is Teflon anti-acid diaphragm, the second is EPDM stretch rubber, the third is ...