Metering pumps, also known as quantitative pumps, are used in many processes. Nowadays, mainstream international brands include Milton Roy metering pumps, OBL metering pumps, Prominent metering pumps, Pulsafeeder metering pumps, etc. Below, we will discuss several issues that need to be noted when selecting metering pumps:

In your selection, please compare whether you have the following 5 points

1. The flow rate (L/h) of the measured liquid and the required pressure (MPa).

2. The main characteristics of the measured liquid include liquid name, chemical corrosiveness, viscosity (cp), temperature (℃), concentration, specific gravity, solid content (for slurry), etc.

3. The back pressure of the system, the stability requirements for flow, and the appropriate suction height

4. The working environment of the metering pump, such as whether it needs to be corrosion-resistant, explosion-proof, etc

5. Other required options include automatic control mode, external control signal types such as analog control, pulse control, flow monitoring, and timer.

Based on the above points, the pump head material (PP, PVC, PVDF, 316SS, 316L, 316TI, etc.), diaphragm material (single diaphragm, double hydraulic diaphragm, sandwich diaphragm, etc.), control mode (manual control, 4-20mA control, frequency modulation control, etc.) of the metering pump can be basically determined. When selecting liquids with relatively high viscosity, please pay attention to using stainless steel sealing balls or double sealing balls (also known as valve balls) to achieve the transmission of viscous liquids

The accuracy of the metering pump can reach about 5% for ordinary precision, and 2% for hydraulic diaphragm metering pumps, depending on the customer's requirements

If the selection is strictly based on the above steps, it is estimated that the selected metering pump will be very suitable.