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ProMinent Spectra progressive cavity pumps are used for transfer and metering of water-like liquids, slurries and viscous chemicals such as polyelectrolyte solutions. The Spectra progressive cavity pumps operate between 0.1 and 250 m3/hr at medium pressure and can be fitted with a variety of rotor and stator materials to suit the chemical being pumped. Progressive cavity pumps are an ideal solution for high flow metering applications where accuracy is required at an economical price.

One interesting application is the combination of a Spectra progressive cavity pump with a positive displacement flow meter for dosing rolling oil. The operator sets the desired flow and the control system ramps the motor speed up and down to maintain the desired oil flow.