Four methods for controlling the flow of centrifugal pumps

Method 1: Export valve opening adjustment
In this method, the pump is connected in series with the outlet line regulating valve. The actual effect is like using a new pump system. The maximum output head of the pump is not changed, but the flow curve is attenuated.

Method 2: Bypass valve adjustment
In this method, the valve and the pump are connected in parallel. The actual effect is like the new pump system. The maximum output head of the pump changes, and the flow curve characteristics also change. The flow curve is closer to the line shape.

Method 3: Adjust the impeller diameter
This method does not use any external components and the flow characteristic curve varies with diameter.

Method 4: Speed ​​control
The impeller speed change directly changes the flow curve of the pump, and the characteristics of the curve do not change. When the speed decreases, the curve becomes flat, and the indenter and the maximum flow rate decrease.

The overall efficiency of the pump system, both the outlet valve adjustment and the bypass adjustment method, increases the line pressure loss and the pump system efficiency is greatly reduced. The impeller diameter adjustment has little effect on the efficiency of the whole pump system, and the speed control method basically does not affect the system efficiency, as long as the speed is not lower than 50% of the normal speed.

Energy consumption level:

Assume that the output flow of the pump is adjusted from 60m3/h to 50m3/h by the above four methods, and the power consumption when the output is 60m3/h is 100% (at this time, the indenter is 70m), then several methods for controlling the flow rate are What is the impact of the power consumed by the pump?

(1) The opening degree of the outlet valve is adjusted, the energy consumption is 94%, and the power consumption is large when the flow rate is low.

(2) Bypass adjustment, the bypass valve reduces the pump head to 55M, which can only be achieved by increasing the pump flow, resulting in a 10% increase in energy consumption.

(3) Adjusting the diameter of the impeller, reducing the diameter of the impeller, the output flow and pressure of the pump are reduced, and the energy consumption is reduced to 67%.

(4) Speed ​​control, the speed is reduced, the flow rate and head of the pump are reduced, and the energy consumption is reduced to 65%.

2022 New Laser Distance Sensor

At the start of 2022, JRT introduce our customers a batch of new series laser distance measurer sensor(S92-20m, S91, BA6A-150m, BA6A-20Hz, M703A-8Hz, U81-10m etc.). Especially S91(RS485 interface and software Rx Tx protocol) and S92(RS232 interface) ip54 enclosure distance sensor model, custoemrs would like to use it in their industrial automation solutions,according to the ip54 waterproof protection level, well protect laser, Wide Voltage 5~32V(Optimize for industrial using), and easy-to-install.
If you are interested in JRT more laser measuring sensors, or you would like buy qty 2 quotation for trial basis, please welcome to contact us.
Kind regards
JRT Team

Chengdu JRT Main Ranging Modules: Industrial Laser Distance Sensors, Laser Rangefinder Sensor , Tof LiDAR Sensors.


laser measuring,infrared sensor,distance measurers,ir range sensor,laser sensor

Chengdu JRT Meter Technology Co., Ltd , https://www.jrt-measure.com