How to Choose a Suitble Dosing Pump?

A dosing pump is a special volumetric pump used to transport liquids, especially corrosive liquids. The flow can be adjusted steplessly in the range of 0-100%. The dosing pump is also called a quantitative pump or a proportional pump. The dosing pump belongs to the reciprocating positive displacement pump. It is used for precise metering. Usually, the stability accuracy of the dosing pump is required to be no more than ±1%. With the continuous development of modern industry towards automatic operation and long-distance automatic control, the advantages of dosing pumps are particularly prominent because of their strong compatibility and adaptability to a wide range of media (liquids).

Dosing Pump Buying Guide

• Determine the pressure： The rated pressure of the selected dosing pump should be slightly higher than the actual maximum pressure required, generally 10-20% higher. Do not choose a dosing pump with too high pressure, which will waste energy and increase equipment investment and operating costs.
• Determine the flow rate： The flow rate should be equal to or slightly larger than the flow required by the process. The use range of the flow rate of the dosing pump is preferably 30 to 100% of the rated flow range, and the repeatability of the dosing pump is high at this time. Considering the economy and practicality, it is suggested that the actually required flow rate of the dosing pump should be selected as 70-90% of the rated flow rate.
• Determine the material of the pump head： After confirming the first two points, select the material of the overflow part according to the properties of the overflow medium. This step is very important. Improper selection will cause medium corrosion and damage to overcurrent components or medium leakage to contaminate the system, etc., and may cause major accidents in serious cases.

Other Aspects

• When selecting a dosing pump, it is also necessary to consider the accuracy level of the required dosing pump. The higher the accuracy level, the greater the investment.
• The general working temperature of the dosing pump is -30 ~ 100 ℃, and the special dosing pump has a wider working temperature range (such as a high-temperature liquid dosing pump with a thermal insulation jacket, the delivery temperature can reach 500 ℃).
• For the particle size of the medium, it should be less than 0.1mm. For the medium larger than 0.1mm, the flow structure of the pump can be changed in a targeted manner to meet the needs.
• The viscosity of the medium should generally be 0 to 1000 mm/s, and the special dosing pump can reach 6000 mm2/s.
• The flow rate of the mechanical diaphragm dosing pump is the maximum flow rate measured under the calibrated rated pressure (when delivering clean water at room temperature). If the pressure drops, the output flow rate will be higher than the calibrated value.