... with the medium convey cavit “Feiya” QDM-901 Pneumatic Diaphragm Pump Field of application: Printing: ink(water-based, gravure), solvent ( ... material, can transmit various corrosive medium. Operating principle:This pump has left and right two groups of diaphragms, aim to ... auxiliary start-up devices (start seal), when the pump initial start hard or stopping work, you should first turn off the inlet ...