What is a Metering Pump & How Does it Work?

Metering pumps are a great choice for industries that need precise fluid handling. They offer accurate dosing, so you can be sure the right amount of fluid or chemical is always delivered. Plus, you can easily adjust them for different flow requirements, whether it’s a small or large amount. Let’s learn more about metering pumps.

What is a Metering Pump?

A metering pump is a type of positive displacement pump designed to deliver precise volumes of fluid at a consistent flow rate. The key feature of metering pumps is their ability to provide accurate control over the amount of liquid they pump, even when dealing with aggressive, viscous, or hazardous chemicals.

These pumps are typically used in applications where precise dosing is crucial, such as adding chemicals to water treatment systems, injecting additives into manufacturing processes, or controlling the flow of liquids in pharmaceutical production.

Features:

• Adjustable Flow Rate – The flow rate can be precisely adjusted by changing the stroke length or speed, allowing for accurate dosing.
• Chemical Resistance – Many metering pumps are constructed from materials that resist corrosion, making them ideal for handling aggressive chemicals.
• Pressure Tolerance – Metering pumps can operate under high pressure, making them suitable for systems requiring consistent pressure to move fluid through the process.
• Versatility – Whether you’re working with viscous liquids, abrasive chemicals, or sensitive biological fluids, metering pumps can handle a wide variety of fluids with ease.

How Does a Metering Pump Work?

The operation of a metering pump revolves around the stroke movement of a diaphragm, piston, or plunger. Here’s a closer look at how the process works:

Suction Stroke – During this phase, the pump’s diaphragm or piston moves backward, creating a vacuum inside the pump chamber. This causes the inlet valve to open, allowing the fluid to flow into the chamber.

Discharge Stroke – As the diaphragm or piston moves forward, the inlet valve closes, and the fluid is forced through the outlet valve, delivering it into the system at a precise rate. The amount of fluid dispensed depends on the stroke length and speed, both of which can be adjusted to meet specific flow requirements.

This cyclic process of drawing in and discharging fluid ensures that the pump delivers the exact amount of liquid needed, which can be as little as a few milliliters per hour to several liters per minute, depending on the pump model and settings.

Types of Metering Pumps

There are several types of metering pumps, each suited for specific applications. The most common types include:

1. Diaphragm Metering Pumps – These pumps use a flexible diaphragm to move the fluid. They are ideal for handling corrosive or hazardous chemicals because the diaphragm isolates the liquid from the pump’s mechanical components, reducing wear and tear.
2. Piston Metering Pumps – In piston pumps, a piston moves back and forth inside a cylinder to displace fluid. These pumps are well-suited for high-pressure applications and can handle thicker fluids like oils or gels.
3. Peristaltic Metering Pumps – These pumps operate by squeezing a flexible tube to move the liquid inside it. Since the fluid only contacts the tubing, s are great for sterile or sensitive applications, such as in the medical or food industry.

Metering pumps are used across various industries, wherever precision dosing is essential. Here are a few key applications:

Metering Pumps for Water Treatment

Metering pumps are commonly used to inject chemicals such as chlorine, pH adjusters, or coagulants into water treatment systems to purify and balance the water.

Metering Pumps for Chemical Processing

In chemical plants, these pumps help dose additives, catalysts, or reactants with high accuracy, ensuring consistent production quality.

Metering Pumps for the Food and Beverage Industry

Metering pumps are used to add precise amounts of flavorings, preservatives, or colorings to food products, ensuring consistency in taste and appearance.

Metering Pumps for Pharmaceutical Production

In the pharmaceutical industry, these pumps play a critical role in dosing ingredients for drug formulation, maintaining the stringent accuracy required for health products.

FAQs About Metering Pumps

Can metering pumps handle different fluid viscosities?

Yes, metering pumps are designed to handle a wide range of fluid viscosities, from water-thin liquids to thick, viscous substances like gels or oils.

How do I adjust the flow rate of a metering pump?

The flow rate can typically be adjusted by changing the stroke length or the pump speed. Some models may allow for electronic adjustments via a control panel.

Are metering pumps suitable for high-pressure applications?

Yes. Many metering pumps are designed to operate efficiently under high pressures, making them ideal for demanding industrial systems.

How safe are metering pumps?

Many metering pumps made from chemical-resistant materials can safely handle hazardous or corrosive chemicals, minimizing risk in dangerous environments.

Get Your Pumps from PumpWorks

Understanding how metering pumps work and their benefits can help you make informed decisions when selecting the right pump for your specific needs.

If you’re looking for expert advice on choosing the right metering pump for your operation, PumpWorks is here to help. Our team of professionals can guide you through the selection process and provide tailored solutions that fit your industrial requirements.

Contact us today to learn more!