The methods for adjustment the flowrate of slurry pumps

      The flowrate adjustment method of slurry pump can be selected in various ways according to different needs and occasions. The following are some common flowrate adjustment methods:

      The first method is outlet valve adjustment, which is currently the most commonly used and more popular method. In the slurry pump discharge pipeline installation of control valves, by changing the valve opening degree to realize the flowrate adjustment. This method is simple and reliable, but the power loss is large, the economy is not good, on the small flowrate or small flowrate adjustment effect is not good. However, the outlet valve regulates the flowrate of a wide range of continuous or intermittent adjustment can be realized, to adapt to different production process requirements.

      The second method is variable speed adjustment, by changing the rotational speed of the slurry pump impeller to adjust the flowrate. This method of additional power loss is very small, is the most economical method. But need to increase the variable speed mechanism and variable speed motor, the initial investment cost is higher. The method of changing the rotational speed is most suitable for turbine, internal combustion engine and DC motor-driven slurry pumps, and can also be used to change the motor speed with variable frequency adjustment, and sometimes can also be adjusted through the use of hydrodynamic coupling to adjust the rotational speed.

      The third method is the bypass adjustment, the use of bypass shunt adjustment flowrate, can solve the problem of slurry pump in small flowrate continuous operation. But cause shunt flowrate not fully utilize the additional loss increase, at the same time process pipeline also increased. Bypass adjustment is set up in the pump suction line bypass valve, so that part of the liquid from the bypass flow back to the suction side, thus reducing the flowrate into the impeller. This method is suitable for processes that require intermittent operation, or long-term operation occasions where the flowrate rate does not change much.

      The fourth method is to cut the outer diameter of the impeller, by cutting the outer diameter of the impeller to adjust the flowrate of slurry pumps, power loss is small, but the impeller can not be restored after cutting that can only be adjusted to the direction of the flowrate of small flowrate. And the impeller cutting range is limited, the flow rate adjustment amplitude is limited. It applies to the occasions which need to work for a long time in a small flowrate and the flowrate of change is not big.

     The fifth method is the cavitation adjustment, by changing the slurry pump inlet pressure (water level, suction valve), cavitation occurs, change the performance curve of slurry pump, so as to change the flow of slurry pump. This method is applicable to the occasions which need for short-term or intermittent adjustment of the flowrate, but because of the cavitation will have an impact on the performance of the pump, it need to pay attention to the stability of the control pressure and flowrate when using.

      In summary, there are many ways to adjust the flowrate of slurry pumps, which can be selected according to the actual situation. Each method has its advantages and limitations, the applicable occasions also will be different.