... operation 3)easy maintenance 4)long servicing API B series Pumping Units is conventional walking beam pumping units, it ... )Rated Torque1B-80D-119-6411,90064,5480,0002B-80D-76-647,60064,5480,0003B-80D-133-5413,30054,4180 ... ,4157,0008B-57D-89-548,90054,4157,0009B-57D-76-547,60054,4157,00010B-57D-109-4810,90048,3557 ... 3557,00012B-40D-89-488,90048,3540,00013B-40D-76-427,60042,2940,00014B-25D-67-366,70036,2725 ...