How to Adjust Pressure of Slurry Pump

Change the speed

According to the basic performance formula of the pump, the pressure is proportional to the square of the rotation speed. By changing the rotation speed of the motor, the pressure of the slurry pump can be adjusted more effectively.

A common method is to use a frequency conversion speed regulation device to adjust the motor speed by changing the power supply frequency, thereby changing the speed of the slurry pump to achieve pressure regulation. This method has high adjustment accuracy, can achieve smooth pressure adjustment within a wide range, and can be adjusted in real time according to actual working conditions, which can effectively reduce energy consumption and improve the operating efficiency of the pump, but requires additional frequency conversion equipment, which increases certain costs.

Regulating valve

Outlet valve adjustment: By changing the opening degree of the outlet valve, the flow rate of the slurry pump can be controlled, thereby indirectly adjusting the pressure. When the small outlet valve is closed, the flow rate will decrease, and the pressure will increase according to the performance curve of the pump; on the contrary, when the large outlet valve is opened, the flow rate will increase, and the pressure will decrease. This method is simple, convenient and fast to operate, but it will increase the resistance loss of the pipeline system and lead to energy waste. It is generally suitable for small-scale pressure regulation.

Imported valve adjustment: Adjusting the opening of the inlet valve can also affect pressure. Close the inlet valve, which will reduce the flow rate entering the pump, and the pressure inside the pump will also change accordingly. However, this method may cause the pump to have poor suction performance and easily cause cavitation and other problems. It is generally rarely used alone and is usually used in conjunction with the outlet valve adjustment.

Change the diameter of the impeller

The impeller is the core component of the slurry pump, and its diameter directly affects the performance of the pump. According to the pump's similarity law, when other conditions such as rotation speed remain unchanged, the pressure is proportional to the square of the impeller diameter.

Replacing impellers of different diameters can change the pressure output of the pump. Increase the impeller diameter and the pressure will increase; decrease the impeller diameter and the pressure will decrease. However, this method requires shutdown and replacement of the impeller, which is relatively complicated to operate, and requires the selection of the appropriate impeller according to the specific pump type and working conditions. It is generally used when there is a large demand for pressure adjustment and other adjustment methods cannot meet it.

Change the impeller series

For multi-stage slurry pumps, the pressure can be adjusted by changing the number of impellers. Increasing the number of impeller stages is equivalent to increasing the number of times the pump does work on the fluid, which will increase the pressure; reducing the number of impeller stages, which will decrease the pressure.

This method is generally used in situations where pressure is adjusted in a large range and the working conditions are relatively stable, because changing the impeller stage requires a large degree of disassembly and assembly of the pump, which has a large workload and may require redesign and selection of some parts.

Change media characteristics

The characteristics of the medium conveyed by the slurry pump also affect the pressure, such as the density and viscosity of the medium. Within a certain range, the medium density or viscosity increases, the resistance that the pump needs to overcome increases, and the pressure will increase accordingly; otherwise, the pressure will decrease.

The characteristics of the medium can be changed by adjusting the concentration of the medium, adding additives, etc., and then adjusting the pressure. However, this method needs to be operated with caution, because changing the characteristics of the medium may affect the wear, corrosion and other conditions of the pump, and may also affect the subsequent process, and various factors need to be considered comprehensively.