Stainless Steel Rotor for Rotary Lobe Pump

The Stainless Steel Rotor for Rotary Lobe Pump is a precision-engineered component designed for reliable, low-pulsation fluid transfer in sanitary, chemical, and industrial applications. Manufactured from 304 (UNS S30400), 316L (UNS S31603), or exotic alloys like 2205 duplex stainless steel, these rotors feature twin-lobe or multi-lobe profiles optimized for gentle product handling and high volumetric efficiency (≥ 95%).

Subjected to rigorous heat treatment and surface finishing, the rotors exhibit excellent wear resistance and dimensional stability, with tight clearance control (0.05-0.15mm) to minimize slip and maintain consistent flow rates across viscosities from water (1 cP) to heavy oils (10,000 cP).

Gentle Product Handling: Symmetrical lobe profiles (2-lobe, 3-lobe, or "banana" design) reduce shear forces, making them ideal for conveying shear-sensitive fluids like emulsions, polymers, and food slurries without degradation.

High Wear Resistance: Through-hardened 316L rotors (28-32 HRC) or case-hardened duplex 2205 (35-40 HRC) resist abrasion from suspended solids (up to 5% by volume), with optional tungsten carbide coatings increasing service life in abrasive media.

Precision Balancing: Dynamic balancing to G2.5 ISO 1940 standard ensures smooth operation at speeds up to 1,500 RPM, reducing vibration and bearing wear in high-cycle applications.

Hygienic Design Options: Electropolished surfaces (Ra ≤ 0.8μm) for food/pharma use or bead-blasted finishes for chemical resistance, with crevice-free geometries compliant with FDA, 3A, and EHEDG standards.

The rotors rotate in opposite directions within a casing. As the lobes rotate, they create cavities that capture and move the fluid from the pump’s inlet port on the suction side to the outlet. The gentle handling of fluids making rotary lobe pump the right choice for applications where maintaining the integrity of the fluid is crucial.

The rotor castings are the most important components of rotary lobe pumps, which are widely applied in water treatment industry, food equipment industry, petrochemical industry, and biopharmaceutical industry,etc

Food & Beverage: Transfers creams, juices, and viscous sauces in bottling plants and dairy facilities, preserving product integrity and enabling CIP/SIP (Steam-in-Place) sanitization.

Chemical Processing: Handles corrosive solvents, adhesives, and polymer melts in petrochemical plants, with duplex stainless steel rotors resisting stress corrosion in chloride-rich environments.

Pulp & Paper: Used in stock pumps to convey fibrous slurries and coatings, with robust lobe tips enduring abrasion from cellulose particles and fillers.

Wastewater Treatment: Moves sewage, sludge, and biofuels in anaerobic digesters, with anti-fouling coatings preventing bacterial buildup and reducing maintenance downtime.

Q: What is the maximum viscosity these rotors can handle?

A: Standard designs handle up to 50,000 cP, while custom low-clearance rotors with increased lobe overlap are suitable for viscosities up to 200,000 cP.

Q: How do I choose between 2-lobe and 3-lobe rotors?

A: 2-lobes offer higher flow rates at lower speeds, ideal for shear-sensitive fluids; 3-lobes provide smoother flow with lower pulsation, suitable for metering applications.

Q: Can the rotors be repaired after wear?

A: Yes—minor wear can be corrected via precision grinding and re-coating, while major damage is addressed through replacement with interchangeable rotor sets, minimizing downtime.