... Pumping Units 1)high reliability 2)simple operation 3)easy maintenance 4)long servicing API B series Pumping Units is conventional walking ... Performances1,High reliability, simple operation, easy maintenance, long service life.2,Gear reducer is involute herring-bone gearing, work smoothly and ... ,70036,2725,00015B-16D-53-305,30030,2316,000 API B Series Pumping Units