Screw pumps belong to the rotary positive displacement family and boast excellent pumping technology for a broad range of applications in the mining, heavy oil and gas, and manufacturing industries. One unit can come with a single screw or multiple screw assembly. Although differentiated by several designs, all screw pump types work by pressurizing fluid as it passes through the screw threads and rotated from the inlet to the discharge side.  

Screw Pump Design 

The construction of this pump is quite simple. Its main pumping mechanism consists of the threaded rotor, the casing (stator) the driver (shaft), and some types have a timing gear included. Hence, installation, maintenance, and servicing can be accomplished quickly and conveniently.  

The clearance between the rotor and the casing is constant, hence creating a uniform volumetric flow. Also, it is the clearance and the rotating motion of the screw that pressurize the fluid and create the pumping action.  

Screw Pump Operation 

A screw pump work by driving a threaded rotor to rotate against the casing or another screw. In designs incorporating two or more screws, the screws rotate in opposite directions so that their threads engage and create a sealed cavity with the casing. As fluid enters the pump, it is trapped between the threads of the meshing screws and rotated within the casing. It moves steadily from the inlet toward the discharge port. SThe pump ensures a volumetrically steady flow rate no matter the amount of pressure applied. Their operating principle makes them a better choice for handling a wide range of liquids, including very viscous ones. 

Screw Pump Benefits

  • Ability to handle a wide range of liquids, viscosities, flow rates, and pressures. 
  • Creates constant volume and steady flow rate despite the pressure applied. 
  • Low operational costs account for the pump’s high efficiencies 
  • Highest flow speed among PD pumps. 
  • Smooth, low vibration, and quiet operation. 
  • High tolerance to entrained air and gases. 
  • Low pulsation resulting in low stress on pump components. 
  • Simple design and easy to install and maintain. 
  • High tolerance to contamination compared to other rotary pumps. 

Screw Pump Types 

Screw pumps are available in different designs according to the number of screw assemblies enclosed inside the casing. Some of the most common types include: 

  • One Screw – commonly known as progressive cavity pump where the rotor shape is twisted rather than threaded. 
  • Two Screw – also known as twin screw pump. The rotors rotate in different directions. One rotor is driven by a power source while the second one is driven by the timing gear. 
  • Three Screw – the triple screw pump has three rotors aligned vertically. One rotor is driven by a power source, which in turn rotates the two other screws. 
  • Four Screw – this is basically two sets of twin screw where one rotor contains two screws that rotate in different directions.  
  • Five Screw – this type is the same as the triple screw but has five screws aligned vertically instead of three. 

At All Pumps, we have a range of screw pumps from the best manufacturers and brands trusted by industries worldwide.  Connect with one of our pump experts and we will help you find compatible equipment for your system.  

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First in Class. Low Cost Ownership. High Reliability for Different Industrial Applications

Wangen is an ISO 9001, ISO 14001, ISO 45001, and DIN EN ISO 3834 certified pump manufacturer that’s known for its revolutionary fluid handling technologies. Wangen has been a leader in the manufacture of sanitary twin screw pumps for over five decades until it jumped into the competition in creating progressing cavity pumps. 

The MX progressing cavity pumps boast modular design and robust construction making them ideal for various applications including hygienic pumping as well as chemical, paint, lacquer and paper transfer. A feature unique to the MX range is its EvenWall® technology, which offers significantly higher pressure stability. The pumps also have high hygiene standards around the joints and seals.

All Wangen pumps carry great versatility, making them able to handle abrasive, adhesive, high viscous, and crumbly materials, as well as liquids that require high hygiene standards. Employing high quality materials, Wangen pumps are made to last longer than others and ensure low maintenance costs.

The Wangen progressing cavity pump range is divided into five types:

  • Immersion Pumps
  • Hygienic Progressing Cavity Pumps
  • Hopper Feed Pumps
  • Hygienic Hopper Feed Pumps
  • Suction Pumps

Sounds like a Wangen progressing cavity pump is the right equipment for your business? Click HERE to read the full details on Wangen pumps and check with our experts whether they are the ideal fit for your system.