sl3nb-500 Single Action Triplex back and forth piston pump: sl3nb-500 is Single Action Triplex back and forth piston pump. The characteristic of design is the first to choose parmeter, approprotely increase excursion and reasonably lower strike number to improve the fuctions of pumps for assimicating. Being firm and durable. The pump is mainly used for oilfield and other industrial and mine enterprise which trasport liquid carrier and meet the need of three adgiting oil technique. Pour oil side into polymer etc. It is suit for Rig15. The serial products are strictly produced by SY5138 standard of Oil Industrial Department and Qingzhou huifang pump co ltd.