Generally speaking, a special pump is a special kind of pump which is used to transport the liquid medium, the use of the requirements and the use of occasions and so on. Such as the transportation of impurities, suspension, volatile, high viscosity, strong corrosive, flammable and explosive, radioactive, toxic and expensive liquid, and the requirements of self suction, the requirements of measurement, high temperature and high pressure and low pressure etc.. As the pump delivery of liquid medium special, the use of special requirements and occasions, so the performance requirements of the pump, structural type, material selection and use of methods and other aspects of the pump is generally more special. However, the special pump is basically developed on the basis of the general use of the pump, in essence, most of the general use of variants of the pump. What kind of pump is a special pump, there is not a unified standard.
With the development of modern science and technology and the development of production, the requirement of the pump is becoming more and more special. For example, high viscosity pump oil sector production requires delivery of liquid viscosity up to hundreds of thousands of CPS; metallurgy, chemical industry, space rockets and other departments require the delivery of liquid medium to low temperature and some 200 degrees below zero, some as high as 800 degrees above the pump, and the reciprocating pump discharge pressure of more than 10 thousand atmospheric pressure etc..
Due to the development of industrial and agricultural production, more and more requirements for special pumps are required. From the current production of pump products, countries, generally with the pump ratio decreased, and special pump a lot of development, gradually increase the proportion of. The development of special pump is a main trend of the development of pump products.
According to the conditions of use and delivery of liquid medium is different, a lot of special types of pump. At present, the most common are self suction centrifugal pump, impurity pump, submersible pump, corrosion pump, canned pump, metering pump, high viscosity pump, high speed part of the flow pump, low temperature pump, high temperature pump and high pressure pump, etc..
