... priming centrifugal pumps of our company, short for self-priming pump ,manufacture in strict accordance with the standard JB/T6663. ... 1-93,which mainly consist of impeller,casing,sealing,bearing body etc, apply to convey clear water or ... construction, factory and mine.principleSelf-priming pump is different with centrifugal pump, you should fill the pump with water before start, then ...