Progressive cavity pumps, also known as: progg cavity pumps, cavity pumps, or PC pumps are well-suited for pumping viscous fluids and materials with high solids content, such as sludges and sewage in wastewater treatment applications. The gentle pumping action of these pumps minimizes shear forces, making them suitable for handling delicate materials without degradation.
The image above contains a progressive cavity pump made by Seepex.
The working principle of a progressive cavity pump involves a helical rotor, typically a single external helix rotating within a double internal helix stator. As the rotor rotates eccentrically within the stator, cavities form and progress along the length of the pump. This action creates a continuous seal between the cavities, preventing backflow and allowing the fluid to be displaced steadily through the pump.
One of the key advantages of progressive cavity pumps is their ability to generate a consistent flow rate, even when handling fluids with varying viscosity or solids content. The design of the pump allows for precise control over flow rates and pressure, making them ideal for dosing and metering applications in wastewater treatment processes.
Progressive cavity pumps are known for their self-priming capabilities and ability to handle fluids with high suction lift. This makes them suitable for applications where the pump may be required to operate under vacuum conditions or lift fluids from deep wells or underground reservoirs.
In wastewater treatment, progressive cavity pumps are commonly used for tasks such as sludge transfer, feeding polymer solutions for flocculation, dosing chemicals for pH adjustment, and transferring thickened slurry to dewatering equipment. Their versatility, efficiency, and gentle pumping action make progressive cavity pumps an essential component in wastewater treatment plants, ensuring reliable and effective handling of challenging fluids and materials throughout the treatment process.
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