Circulation pump: the device conveys the reaction, absorption, separation, absorption fluid regeneration circulating fluid pump. Commonly used single-stage centrifugal pump. Circulating pump flow medium size, stable operating conditions, the pump flow changes smaller. Its low lift, just to overcome the pressure drop of the circulatory system. Can use low-lift pump. Circulating pump is the role of the pump, the centrifugal pump is the pump structure, the two are completely two concepts. The working principle of the circulating pump The pump used to circulate the water is called the circulating pump, for example, the hot water in the plumbing heating pipe is circulated by the circulating pump.