Proper selection of several elements of the metering pump

What information do you need to properly select a metering pump? To ensure the right metering pump is chosen for your application, several key factors must be considered. First, you should know the required flow rate of the liquid being measured. Second, it’s important to understand the main properties of the liquid, such as its chemical compatibility, viscosity, and specific gravity. These characteristics can affect pump performance and material selection. Third, the system's back pressure must be known, as it influences the pump’s ability to deliver the correct dosage. Fourth, the suction lift or the height from which the liquid is drawn needs to be determined. Lastly, additional features like analog control, pulse control, flow monitoring, or timer functions may be necessary depending on the application. What are the main advantages of an electromagnetically driven metering pump? Electromagnetically driven metering pumps have a simple design with only one moving part—the armature shaft. This minimal number of moving parts increases reliability and reduces maintenance. These pumps are particularly well-suited for low-flow, low-pressure environments and offer stable performance even when there are fluctuations in the power supply. Their simplicity also makes them more energy-efficient and easier to maintain compared to other types of metering pumps. What are the benefits of adjusting the frequency versus changing the stroke length on a metering pump? Adjusting the frequency allows for precise control over the dosing rate. Since each stroke delivers a fixed volume, the total dose is calculated by multiplying the dose per stroke by the frequency. This means that the dosing is directly proportional to the frequency—50% frequency equals 50% dosage. This method offers fast response times, allowing the dosage to vary from minimum to maximum in just a few seconds. Additionally, controlling frequency is generally more cost-effective than adjusting the stroke length, which often requires more complex mechanical components. How do you use the performance curve of a metering pump? To use the performance curve effectively, first locate the curve that corresponds to the selected metering pump model. Next, identify the back pressure in the system, as this value will be used to determine the correction factor. On the graph, mark the back pressure value and draw a vertical line up until it intersects the performance curve. From that intersection point, draw a horizontal line to the left to read the correction factor. Then divide the desired dosing rate by this correction factor to get the actual required flow rate in ml/min or L/h. Finally, place this calculated value on the dosing scale and use a ruler to determine the appropriate stroke length and frequency settings. This process ensures accurate and efficient operation of the metering pump under real operating conditions.

Bimetallic Alloy Screw & Barrel

Bimetallic Alloy Screw & Barrel,Injection Molding Screw Barrel,Bimetallic Screws And Barrels,Bimetallic Single Screw & Barrel

Zhejiang Jinhai Plastic Machinery Co., Ltd. , https://www.jinhaiextruder.com