Progressive cavity pumps have become a staple piece of equipment for accurate metering and dosing across various industrial sectors. Their unique design allows for precise transfer of a wide range of difficult fluids. In this article, we will explore how progressing cavity pumps can be optimized for low-flow metering and dosing applications through customized designs.

Progressive Cavity Metering Pumps

Progressive cavity pumps are inherently suitable for low-flow metering applications due to their positive displacement design. By precisely controlling the rotational speed of the rotor, flow rates as low as 0.1 L/min can be reliably achieved. This makes progressive cavity pumps well-suited for dosing small quantities of chemicals, additives and other process materials.

For metering applications, specialized progressive cavity pump designs known as progressive cavity metering pumps have been developed. These incorporate features such as high-precision gears and variable frequency drives to optimize accuracy and repeatability at flow rates below 5 L/min. Metering-specific components like integral pulsation dampeners further smooth out the discharge pulse to reduce dosing errors.

Table 1: Features of Progressive Cavity Metering Pumps

Progressive Cavity Dosing Pumps

When metering requirements exceed typical process material viscosities, progressive cavity dosing pumps provide an optimal solution. Customized designs accommodate fluids up to 100,000 cP through specialized materials, clearances and cavity profiles. Dedicated dosing pump models optimally handle high-viscosity slurries, pastes and non-Newtonian fluids with precision.

Low Flow Progressive Cavity Pumps

For dosing applications requiring flow rates under 1 L/min, low flow progressive cavity pumps address higher viscosity handling needs. Features include oversized stator diameters up to 100 mm to minimize internal clearances. Elastomer compounds catered for each application maximize wear resistance and cavitation prevention. Variable speed drives coupled to high resolution encoders enable consistent sub-liter dosing.

An example is a progressive cavity dosing pump customized to add less than 0.5 L/min of 6000 cP grease into a mixing machine. The 130 mm stator pump operates at 6 rpm to precisely dose grease through a 1/8" discharge line. Intricate cavity profiling transfers the shear sensitive fluid without degradation.

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Applications of Progressive Cavity Metering Pumps

Progressive cavity metering pumps excel in precise dosing of critical additives and process materials. Here are some key industries and typical applications:

Water Treatment

• Polymer addition for flocculation
• Chlorine dosage for disinfection
• Corrosion inhibitors

Pulp & Paper Manufacturing

• Chelating agents for softening
• Biocides for microbiological control
• pH adjusters

Food & Beverage Processing

• Vitamin/mineral fortification
• Emulsifiers for texture manipulation
• Colorants and flavorings

Pharmaceutical Production

• Active drug substances metering
• Excipient addition for tablet presses
• Coating solutions

Customization for Unique Applications

When standard progressive cavity metering pumps are not suitable, custom designs address unique challenges. Examples include exotic alloy wetted paths for corrosive acids and bases. Large 150-200 mm pumps dose concentrated slurries at flow rates under 10 L/min. Sanitary designs with laser welded chambers meter pure and potent drugs sterilely. From explosive-proof versions to hygienic models, progressive cavity technology continues to innovate dosing solutions across industries.

Low-flow progressive cavity metering and dosing pumps have earned their place as indispensable components across many process industries. Their consistent and smooth metering capability allows for exact addition of critical substances down to fractions of a liter per minute. Customization further expands their application range for difficult and non-ideal fluids. With continuous technological innovation, progressive cavity pumps will remain a go-to solution for precision process feeding and additive metering applications.