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. Third, the classification based on the type of pump pump range, according to the principle can be divided into: ① power pump, also known as impeller-type pump or vane pump, relying on rotating impeller fluid dynamic action on, the energy is continuously transferred to the liquid , NSQ2000-20-200, so that the kinetic energy of the liquid (mainly) and the pressure increases, followed by extrusion chamber kinetic energy is converted to pressure energy, NSQ, can be divided into centrifugal, axial flow, partial flow and vortex pump pumps. ② positive displacement pumps, seals rely on periodic changes inclusive working space fluid volume, the energy is periodically transferred to the liquid, the liquid pressure increased to forcibly discharge the liquid, according to the motion in the form of a working element can be divided into reciprocating pump and rotary pumps. NSQ20-25-4 | NSQ | submersible sand suction pump provided by the Shijiazhuang-school Pump Company. Road Zhiyuan, temper forward. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) aims to become and you win symbiosis, strategic partners to move forward, more determined to become the other's most influential business, and you leap together to success!