According to the metering pump working principle, how to choose a metering pump for the dosing device?

Metering pump is a device that can accurately control liquid flow and is often used in industrial applications that require precise batching or flow control. The working principle of the metering pump is based on the change of volume, which is usually achieved by using structures such as plungers, screws or diaphragms.

Here is how a metering pump works:

1.Plunger metering pump:

▪Suction stage: When the plunger moves backward, the suction valve of the pump opens and the liquid is sucked into the pump body.

▪Discharge stage: When the plunger moves forward, the suction valve closes, and the discharge valve opens at the same time, and the liquid is pushed out of the pump body.

2.Screw metering pump:

▪Suction stage: The screw rotates and the liquid is sucked into the pump body from the suction end.

▪Discharge stage: When the screw rotates, the liquid is pushed along the spiral groove of the screw to the discharge end.

3.Diaphragm metering pump:

▪Suction stage: When the diaphragm is compressed, the volume inside the pump body increases and liquid is sucked into the pump body.

▪Discharge stage: When the diaphragm returns to its original shape, the volume inside the pump body decreases and the liquid is discharged from the pump body.

Metering pumps are often equipped with sophisticated control systems that can adjust the pump's operating speed or the degree of compression of the diaphragm to precisely control the volume of liquid pumped each cycle. This precise flow control makes metering pumps widely used in chemical, pharmaceutical, food and other fields that require accurate ingredients.

Fluid metering pump is one of the most core accessories in the dosing device. When choosing a metering pump in the dosing device, you usually need to consider the following factors:

▪Accuracy requirements:

Different application scenarios have different requirements for dosing accuracy. If very high precision is required, such as in the water treatment industry, it is usually necessary to choose a metering pump with higher precision. Piston metering pumps generally provide higher accuracy.

▪Flow requirements:

The flow range of a metering pump is usually determined based on the specific model and design. Make sure the flow range of the selected pump meets the needs of the dosing system.

▪Corrosion resistance:

Consider the chemical properties of the liquid being processed and select pump materials with good corrosion resistance. For highly corrosive liquids, metering pumps made of special materials are usually chosen.

▪Working environment:

Consider the environment in which the metering pump will be installed. Some metering pumps are explosion-proof and suitable for use in flammable and explosive environments. At the same time, the durability and stability of the pump also need to be considered to ensure that it can work normally in various harsh environments.

▪Control method:

Metering pumps can usually be controlled manually, automatically or remotely. Choose the appropriate control method according to actual needs.

▪Maintenance and care:

Consider metering pump maintenance and upkeep requirements. Some metering pumps are designed to be simple and easy to maintain, which will reduce maintenance costs in the long term.

Cost Considerations:

Finally, of course, there is also budget to consider. The prices of metering pumps of different models and brands vary greatly, and it is necessary to find a balance between performance and cost.

When selecting a metering pump for dosing equipment, the above aspects should be considered comprehensively.