This screw pump stator is made of nitrile rubber and is suitable for flow rates of 3-5 tons per hour and pressures up to 1.6 MPa. Inquiries are welcome from all industries.
Screw Pump Stator
Maintaining high efficiency and low transmission power is crucial only if the rotor and actuator are perfectly aligned. For this reason, a stable geometry between the two transmission elements is crucial. A calibrated magnetic core prevents significant tapering at the actuator ends.
This ensures smooth operation throughout the entire actuator length.
Typically, stators are manufactured specifically for each size and pressure level. This custom-made stator production allows for stators with sealing flanges at both ends of the pipeline.
The Constant-Wall-Thickness Nitrile rubber screw pump stator—commonly referred to as a rubber sleeve—is a critical component of progressive cavity screw pumps, providing consistent flow, high efficiency, and durability. Designed to maintain uniform wall thickness, this stator ensures optimal rotor engagement, reducing wear and prolonging pump life.
Manufactured from high-quality nitrile rubber (NBR), it offers excellent resistance to oils, fuels, and a wide range of chemicals, making it suitable for industrial, chemical, and food applications. The constant-wall design guarantees even stress distribution along the rotor, improving pumping efficiency and minimizing leakage or backflow.
The stator is the stationary inner lining of a screw pump, inside which the helical rotor rotates eccentrically. A constant-wall-thickness design provides several advantages:
Uniform clearance between rotor and stator for consistent fluid movement.
Reduced localized stress, preventing premature wear.
Improved self-priming and pumping efficiency, particularly with viscous and abrasive fluids.
The nitrile rubber material offers high flexibility and resilience, while maintaining chemical compatibility and thermal stability within normal industrial operating temperatures.
Outer Casing Interface: Rigid or semi-rigid shell to hold the elastomer in place.
Elastomer Body (NBR): Provides the sealing and progressive cavity formation.
Inner Bore: Matched to the rotor geometry to ensure tight sealing.
Constant-Wall Profile: Ensures even engagement with the rotor, reducing vibration and wear.
Optional Coatings: For specific applications, a chemical-resistant or anti-abrasion coating can be applied.
The nitrile rubber stator works in conjunction with a helical rotor to form a series of sealed cavities. As the rotor rotates eccentrically:
Cavities progress from the suction side to the discharge side, moving fluid continuously.
The constant-wall thickness ensures uniform pressure along the rotor, minimizing internal leakage and energy loss.
The flexible rubber stator adapts to fluid viscosity and allows the pump to handle particulate-laden, abrasive, or viscous fluids without clogging.
This principle makes the screw pump with a constant-wall stator ideal for precise metering, high-viscosity fluid handling, and continuous pumping applications.
| Parameter | Description |
Material | Nitrile Rubber (NBR), hardness 35–55 Shore A |
Wall Thickness | Constant profile, precision molded |
Rotor Compatibility | Single screw, Progressive cavity pumps |
Temperature Range | -20°C to 100°C (standard NBR), up to 120°C with special formulations |
Viscosity Range | 1 mPa·s – 500,000 mPa·s |
Chemical Resistance | Oils, fuels, mild acids, alkaline solutions |
Life Expectancy | 6–36 months depending on application and abrasion |
Size Range | Inner diameter: 10 mm – 500 mm; length: customizable |
Application | Industrial, chemical, food-grade, slurry, wastewater |
Installation | Press-fit into pump casing or clamped design |
Constant-Wall-Thickness Design – Ensures even stress distribution and prolonged rotor life.
High Chemical Resistance – Nitrile rubber is compatible with oils, fuels, mild acids, and alkalis.
Wear-Resistant – Suitable for abrasive fluids, slurries, and particulate-laden liquids.
Versatile Application – Compatible with a wide range of progressive cavity pumps, including food-grade and industrial pumps.
Reduced Vibration and Noise – Uniform wall engagement minimizes mechanical noise.
Easy Replacement – Modular design allows quick stator swaps without disassembling the entire pump.
Sanitary Options – FDA-approved NBR available for food, beverage, and pharmaceutical industries.
Energy Efficient – Lower friction and leakage reduce pumping power consumption.
Transfer of chocolate, peanut butter, honey, syrups, sauces, fruit pulps.
Dairy products: yogurt, cream, cheese slurry.
Ensures low shear and minimal aeration.
Resins, adhesives, lubricants, polymers, paints, coatings.
Compatible with abrasive or viscous chemical fluids.
Ideal for metering and batch transfer.
Transfer of ointments, gels, lotions, creams.
Preserves product integrity with gentle pumping.
Supports CIP/SIP cleaning procedures for hygiene compliance.
Sludge, slurry, and wastewater handling.
Resistant to abrasive solids and high-viscosity sludge.
Suitable for filter press feeding and dewatering.
Paints, inks, adhesives, and sealants.
Provides consistent flow for batching and dosing.
Reduces wear on rotors in abrasive fluid environments.
Clean the pump casing thoroughly.
Inspect the rotor for wear or damage.
Align the stator carefully with the rotor geometry.
Press-fit or clamp the stator in place.
Verify proper alignment to avoid premature wear.
Start pump at low speed, gradually increasing to operational RPM.
Monitor pressure, temperature, and flow to ensure optimal performance.
Avoid dry running, which can damage the elastomer.
For viscous or abrasive fluids, use appropriate lubrication and feed rate.
Stop pump gradually.
Flush stator with compatible cleaning fluid to remove residual product.
Inspect for wear and schedule maintenance as needed.
Daily: Rinse with water or cleaning solution; wipe external surfaces.
Periodic: Inspect stator integrity, hardness, and surface wear.
Replacement: Replace stator if tears, cracks, or excessive wear observed.
Avoid using sharp tools during cleaning to prevent damage.
| Problem | Possible Cause | Solution |
Low flow | Stator wear or rotor misalignment | Inspect and replace stator; realign rotor |
Noise | Rotor-stator contact or uneven wear | Check alignment; replace stator if needed |
Leakage | Stator crack or improper installation | Replace stator; ensure correct press-fit |
Overheating | High viscosity or dry run | Reduce speed; ensure adequate lubrication |
Vibration | Rotor imbalance or worn stator | Balance rotor; replace stator |
Wear gloves and eye protection when handling nitrile rubber.
Do not exceed recommended operating temperature.
Avoid dry running; always maintain fluid in pump.
Follow manufacturer guidelines for installation and maintenance.
High Durability: Long-lasting nitrile elastomer
Chemical Resistance: Compatible with oils, fuels, and mild chemicals
Constant-Wall Design: Reduces wear and improves flow consistency
Versatile Applications: Food, chemical, pharmaceutical, industrial
Energy Efficient: Low friction and reduced leakage
Easy Maintenance: Quick replacement and inspection
Q1. What is the maximum operating temperature?
A1. Standard NBR: up to 100°C, high-temp formulations up to 120°C.
Q2. Can it handle abrasive fluids?
A2. Yes, nitrile rubber is wear-resistant, suitable for slurry and particulate fluids.
Q3. How long does a stator last?
A3. Typically 6–36 months, depending on viscosity, solids, and operating conditions.
Q4. Is it food-grade?
A4. Yes, FDA-approved NBR is available for food and pharmaceutical applications.
Q5. Can I use it for high-viscosity fluids?
A5. Yes, compatible with fluids up to 500,000 mPa·s.
Q6. How do I replace the stator?
A6. Align the rotor and casing, press-fit or clamp the new stator, verify alignment, and start pump gradually.
The Constant-Wall-Thickness Nitrile Rubber Screw Pump Stator (Rubber Sleeve) is a critical component for maintaining high-efficiency, durable, and precise operation in progressive cavity pumps. Its uniform wall thickness, chemical and wear resistance, and versatile compatibility make it indispensable for industrial, chemical, food, and pharmaceutical applications. By ensuring low pulsation, minimal leakage, and long rotor life, this stator optimizes pump performance, reduces maintenance costs, and enhances operational reliability.
With easy replacement, energy-efficient operation, and sanitary options, it is a premium solution for modern screw pump systems, helping industries handle high-viscosity, abrasive, and sensitive fluids safely and efficiently.
Copyright ? Jiangsu Longjie Pump Manufacturing Co., Ltd.
Phone