Coolant pump

 Defined as ns = 3.65n / H, where n is the speed, r / min; Q for the flow, m / s; H for the head, m. Ns <300 for the centrifugal pump; ns = 300 ~ 500 for the mixed flow pump; ns> 500 for the axial flow pump. Main pump than the speed is usually ns = 340 ~ 465, are mixed flow pump.