3nb drilling mud pump is designed according to api 7k design characteristics is an optimization parameter, increased the stroke properly, lowered the speed reasonably, improved the suction capability of the pump, prolonged the service life of wearing parts the pump used for oil-field and other industrial and mining establishments; used for the drill, well work over and transport the liquid media mainly installed on 20~25 rig.The series pump produces according to sy5138 of the petroleum industry standard strictly, and carry through factory's experiment according to the standard.