6) When diving mud pumps with cooling shroud power must ensure the continued injection of clean cold water, drain and ensure the smooth flow of cooling water from the cooling apparatus flows into the lower side, NSQ300-30-55 pumping sand pump, the upper end of the outflow from the other side. 7) Use 500V megohmmeter to measure the motor cold insulation resistance should not be less than 50ΜΩ. 8) Note: After the unit normal operation, you should always observe the power supply voltage, current, pump flow and pump vibration is normal. As one of the following occurs should immediately stop inspection:. A operating current exceeds the rated current. B. rated head when pump intermittent water flow decreased 20% or over. C. When the pump work without cooling unit pump motor part out of the water, NSQ250-35-55 pumping sand pump, or with cooling device out of the water pump volute part time. D. Power supply voltage is too high or too low (above 400V or lower than 340V). E. motor insulation resistance below 0.5ΜΩ. F. unit has noticeable vibration and noise. Third, the classification based on the type of pump pump range, according to the principle can be divided into: ① power pump, pumping sand pump, also known as impeller-type pump or vane pumps, dynamic action of the rotating impeller rely on liquid, the continuous energy passed to the liquid, so that the kinetic energy of the liquid (mainly) and the pressure increases, followed by extrusion chamber kinetic energy is converted to pressure energy, can be divided into centrifugal, axial flow, partial flow pump and vortex 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. NSQ200-30-45 pumping sand pump submersible slurry pump (online consultation), supplied by pumping sand pump Ltd. Shijiazhuang-school Pump. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) is Shijiazhuang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Pump in Shijiazhuang-school leadership with the staff warmly welcome all inquiries negotiations to create the Shijiazhuang-pump send a better future.