... Conservation : low noise ; leak-tightness; reasonable selection of materials;easy maintenance, manufacturer AY oil pumpAY-type oil pump ... first reconstruction, Y-centrifugal oil pump, S-first impeller double-suction,,material code of over-current partsI-class HT12547,-class ZG25 ... ,-class ZG1Cr13Ni.60, 150-single-stage lift (m) 2-stageB,the orders of ...