BW-320 Mud pump is a horizontal, triplex, single acting reciprocating directly plunger pump. It has the advantages of multi-speed shift gears for variable displacement, compact construction, light weight, move readily with the trail car frame and easy to be operated, etc. BW-320D Mud pump is provided with two kinds of plunger, 80mm is for core drilling of ordinary bore,60mm is for core drilling of small bore with diamond bit, the depth of the hole can reach to 2500 meters. The pump can be driven by electric motor or diesel engine according to the requirement of customers in order.