The new Pageboy SFD15 self-priming diaphragm pump from Pump Engineering has been designed for use with aggressive or corrosive liquids.Unlike other diaphragm pumps,which use a rod to return the diaphragm,the SFD15 uses a venturi to create a vacuum behind the diaphragm.At the end of its suction stroke,a control rod attached to the diaphragm blocks the outlet on the venturi,diverting air on to the back of the diaphragm,creating the discharge stroke.As it is used simply to separate the air from the liquid,is not subject to the same stresses as a conventional diaphragm.
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