Stator Function in Eccentric Screw Pumps
The stator is essential for fluid transfer and works together with the rotor. The geometry, number of stages and materials used have a direct impact on the pump’s efficiency, flow rate and pressure.
The stator is the most commonly replaced part.
It wears naturally due to the constant friction caused by the rotation of the rotor.
How often it should be replaced depends on the type of fluid being pumped, the speed at which the rotor rotates and various fluid specifications such as abrasiveness, corrosiveness, solid particle content, etc.
Certain fluids containing more or less hard or abrasive particles tend to shorten the life of the stator.
Over time, this friction can compromise the stator’s ability to maintain a perfect seal, affecting the pump’s efficiency. Like your car’s tyres, the stator eventually needs to be replaced to ensure optimal pump performance.
Stator Characteristics
Steps and Geometry
- Single Stage
Single-stage stators are suitable for low-viscosity fluids. - Multi Stages
Multi-stage stators handle higher viscosity fluids and reduce pulsation by creating more cavities in the fluid. The more stages, the higher the output pressure.
For higher pressure requirements, multi-stage stators combining multiple rotor-stator pairs are used. These pumps are ideal for high-pressure applications.
Typically, a screw pump has between one and four stages, with each stage capable of delivering a pressure of about 6 bar. Some multi-stage pumps have up to eight stages and 48 bar.
Rotor Angle or Rotor Eccentricity
- A steep angle increases the pressure generated.
- A shallow angle increases the flow rate.
Choose the Stator Material According to your Application
- NBR (Nitrile Butadiene Rubber)
Offers good resistance to oils and fuels but has limited temperature and chemical resistance - EPDM (Ethylene Propylene Diene Monomer)
Provides excellent resistance to heat, ozone, and weathering, making it suitable for outdoor applications - FKM (Fluorocarbon)
Exhibits superior chemical and temperature resistance, ideal for handling aggressive fluids
Contact us for in-depth analysis of fluid compatibility.
Available Polymers for Stator Construction
- Black nitrile, white nitrile
- EPDM Black, EPDM white
- SBLBM
- Buna CB
- CSM
- HNBR
- Silicone
- Perbunan®
- Nitril®
- FKM
- Viton®
- Natural rubber
- Teflon®
Spare Parts for Eccentric Screw Pumps
SPS Pumps maintains a comprehensive inventory of spare parts for all major brands of eccentric screw pumps, ensuring quick and efficient solutions for your maintenance and repair needs. Whether you require stators, rotors, coupling rods, joints, or other critical components, we have them readily available in stock. Minimize downtime and keep your operations running smoothly with SPS Pumps’ extensive spare parts inventory.
All brands are mentioned as for information only.
They are the exclusive property of their respective owners.
SPS Pumps
Your Trusted Partner for Eccentric Screw Pump Solutions
When it comes to eccentric screw pumps (or progressive cavity pumps), whether you’re selecting the right pump or sourcing hard-to-find spare parts, SPS Pumps is your ideal partner.
Need Assistance? Contact Us Today
Call us at +32 2 657 23 53 or email us at info@sps-pumps.com.
Remember: When it comes to eccentric screw pumps, choose SPS Pumps – your trusted partner for expert guidance, reliable solutions, and outstanding service.
