Early in 1588, there will be a record about 4 blade vane pump, NSQ200-55-75 suction sand pump, one after another appeared in a variety of other rotary pump. 1689, NSQ200-45-75 sand pump suction, France D. Papin invented a 4 blade impeller centrifugal pump volute. In 1818, the United States appeared in a centrifugal pump with radial straight blade, semi-open double-suction impeller and volute. 1840 and 1850, the United States, HR Worthington invented the pump cylinder and the steam cylinder opposed steam direct action piston pump, NSQ350-35-75 suction sand pump, marking the formation of the modern piston pumps. 1851 ~ 1875, suction sand pump, multi-stage centrifugal pump with guide vanes have been invented, so the development of high-lift centrifugal pump as possible. Subsequently, various pumps after another. With the application of advanced technology, the efficiency of the pump gradually increase the scope and application performance are increasingly expanding. When geological core drilling, the return rate is generally 0.4 to 1 m / min or so. Mud pump pressure depends on the depth of the borehole, the resistance to fluid passage through which the fluid nature of the transmission and the like. Deeper drilling, the greater the pipeline resistance, the higher the pressure required. With the change in the depth of the hole diameter ﹑ required pump displacement can be adjusted at any time. The transmission mechanism is provided in the pump or hydraulic motor to adjust its speed in order to change the displacement of the goal. NSQ200-45-75 suction sand pump, NSQ pumping sand pump (high merchant) provided by the Shijiazhuang-Pump Co., Ltd. faction. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) is specialized in "slurry pumps, submersible pumps, sewage pumps, chemical pump, pulp pump, water pump, mud pump, multi-stage" of the enterprise, the company of " honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Xu.