A screw pump unit is a device where generating of pressure is provided by liquid displacement by one or more metal screw rotors rotating inside the stator of corresponding shape.

Screw pumps are used for dispensing viscous fluids, such as wastewater treatment plants, where they are used to feed flocculants ready solutions.

 

The pumps are available in two types of configuration: with manual and automatic adjustment of performance. Pump motors are designed for use with frequency inverters and are equipped with thyristor censors. If the pump is operating within the acceptable range of speeds, integrated motor fan will cool down the device. To avoid overloading the motor, thyristor sensors can be connected to the frequency inverter. The engine is connected to the pump unit by a flange connection.

 

Pumps designed for feed of medium with viscosity up to 250,000 mPa at a temperature up to 70°C, for example, epoxy resin and bitumen, can be supplied upon request.

 

Advantages:

  • uniform feed of liquid, unlike piston and plunger-type pumps;
  • the ability to liquid self-suction;
  • variable feed direction (reverse);
  • the possibility of obtaining a higher outlet pressure without many pumping stages;
  • good mechanism balance and, as a result, low-noise operation.