How to Choose a Metering Pump

Selection needs to follow the steps below:

1. Determine the pressure:

The rated pressure of the selected metering pump is slightly higher than the actual maximum pressure required, generally 10-20% higher. Do not choose too high, too high pressure will waste energy, increase equipment investment and operating costs.

2. Determine the flow rate:

The flow rate of the selected metering pump should be equal to or slightly greater than the flow rate required by the process. The flow rate of the metering pump should be within 30% to 100% of the rated flow range of the metering pump. At this time, the repetition accuracy of the metering pump is high. Considering the economy and practicality, it is recommended that the actual required flow rate of the metering pump be selected as 70-90% of the rated flow rate of the metering pump.

3. Determine the material of the pump head (fluid end):

After the specific model and specifications of the metering pump are determined, it is very important to select the material of the flow part according to the properties of the flow medium. If the choice is not appropriate, it will cause medium corrosion to damage the flow parts or medium leakage to pollute the system. In serious cases, it may cause major accidents.

other aspects:

When selecting a metering pump, it is also necessary to consider the accuracy level of the required metering pump. The higher the accuracy level, the greater the investment. The general working temperature of metering pump is -30～100℃, and the working temperature range of special metering pump is wider (for example, the delivery temperature of high temperature liquid metering pump with insulation jacket can reach 500℃). For the particle size of the medium, the requirement should be less than 0.1mm,

For media larger than 0.1mm, the flow structure of the pump can be changed to meet the needs. For the viscosity of the medium, it should generally be 0-1000mm/s, and the special metering pump can reach 6000 mm2/s. The flow rate of the mechanical diaphragm metering pump is the maximum flow rate measured under the calibrated rated pressure (clear water delivery at room temperature) When), if the pressure drops, the output flow will be higher than the calibration.