Who has some knowledge related to partial flow pumps?

A type of rotary pump, also known as a tangential booster pump. Its working principle is the same as that of a centrifugal pump; it generally uses an impeller with open radial straight blades, and only a portion of the liquid flowing inside the pump is discharged through conical diffuser tubes in a direction tangent to the circular casing. Its feature is that it allows the flow rate and head to be adjusted by changing the dimensions and rotation speed of the conical diffuser tube, thereby **expanding the performance range of the pump and achieving a high degree of versatility ； The pump is small in size, light in weight, and easy to maintain. The disadvantage is that when the flow rate is high enough to make the liquid velocity at the throat of the diffuser approach the impeller speed, the pump’s head drops sharply. It is commonly used in chemical plants for transporting liquid ammonia, as well as in the petrochemical industry for liquids with high temperatures and low viscosity.