What exactly is a metering pump?
A metering pump is a system that adds tiny but specific quantities of liquid to other fluid sources or vessels. Metering pumps are also used as dosing and proportioning pumps. A metering pump must be capable of supplying liquid with greater than 3% accuracy over a large range of discharge pressures.
Metering pumps are used in what applications?
Metering applications that are often used include:
- Maintaining a steady flow rate in the face of changes in lateral pressure or fluid viscosity.
- Providing a vector flow in order to maintain a system parameter (for example, pH).
- Injecting a single dose (typically required in batch processing).
Many sectors, including pharmaceuticals, water and waste disposal, food and beverage manufacturing, power generation, chemical refining, petrochemicals, and oil and gas extraction, require metering. Liquids can range from fragrances and pigments used in the manufacture of toiletries and food to acids and alkaline solutions used in chemical processes and water treatment.
What type of pumps are used for metering?
A centrifugal pump can be used to produce a controllable flow when delivering low viscosity liquids at high flow speeds (>1 m3/h) and low delivery pressures. This is likely to be the most cost-effective choice. In other cases, however, precise metering necessitates the use of a positive displacement pump. This type of pump pushes a fluid by continuously enclosing a set volume and mechanically moving it through the device with the assistance of seals or valves. The pumping operation is cyclic, and a given distribution rate or precise single dose can be achieved by adjusting the motor’s speed or stroke duration.
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