Stainless Steel Pump Impeller for Vacuum Pumps

Manufactured from corrosion-resistant alloys such as 316L (UNS S31603), 254 SMO (UNS S31254), or duplex 2205 (UNS S32205) via investment casting, these impellers feature precision-machined blade profiles optimized for minimal gas slippage and low cavitation risk at high rotational speeds (up to 10,000 RPM).

Designed for tight clearances (0.05-0.1mm) and balanced geometries, the impellers meet ISO 2858 and API 681 standards, ensuring reliable operation in vacuum levels as low as 1 mbar (abs) and gas handling capacities up to 10,000 m³/h.

This casting part is a vacuum pump impeller, a kind of open impeller with many curved blades equally straddled around the center hub.

We strictly control the production process to get the complicated  structures,ensure the thickness &geometric tolerance of blades and critical machining accuracy.

The lost-wax casting with silica sol technique will help get the fine blade surface roughness for efficient working performance.

Low-Cavitation Blade Design: Curved vanes with optimized leading-edge radii (5-8mm) reduce pressure gradients, minimizing vapor bubble formation in low-pressure environments and improving pump efficiency by 15% compared to flat-blade designs.

Superior Corrosion Resistance: 254 SMO impellers resist pitting in chloride-rich gases (≤ 50,000 ppm Cl⁻), while 316L offers cost-effective performance in general vacuum applications, with optional electropolishing to enhance surface passivation.

High-Speed Balance Assurance: Dynamic balancing to G1.0 ISO 1940 standard eliminates vibration-induced wear, ensuring smooth operation even at maximum speeds and extending bearing life by 30%.

Material Compatibility Matrix: Engineered for gases, vapors, and low-solids slurries, with hardened coatings (e.g., Stellite® 6) on vane tips for abrasion resistance in dusty or particle-laden streams (≤ 5% solids by volume).

The vacuum pump impeller is the core rotating component of a vacuum pump.The impeller ensures smooth operation, low energy consumption, and the ability to handle various media, including gases and liquids. It plays a critical role in maintaining the pump's performance and reliability.

Vacuum pump impeller castings are widely used in industries that require efficient vacuum generation and fluid handling, such as water treatment industry, food equipment industry, petrochemical industry, marine industry,and semiconductor industry,etc.

Chemical Vacuum Systems: Used in distillation, drying, and degassing processes, handling aggressive gases like chlorine, ammonia, and solvent vapors with 254 SMO impellers.

Pharmaceutical Manufacturing: Integral to lyophilization (freeze-drying) equipment and vacuum concentrators, where 316L impellers meet cGMP standards for biocompatibility and cleanability.

Electronics Production: Deployed in vacuum deposition and semiconductor fabrication, ensuring particle-free operation and resistance to plasma-induced corrosion in argon, nitrogen, and oxygen environments.

Food Processing: Forms the core of vacuum packaging machines and deaerators, with electropolished 316L impellers complying with FDA 21 CFR Part 117 for direct food contact.

Q: How is cavitation prevented in low-pressure applications?

A: The impeller’s NPSH (Net Positive Suction Head) requirement is minimized via blade contouring, and optional suction inducer vanes further reduce vaporization risks in critical processes.

Q: Can these impellers handle wet vacuum conditions with liquid carryover?

A: Yes—duplex 2205 impellers tolerate up to 10% liquid entrainment, with reinforced vane roots preventing fracture from liquid slugging.

Q: What is the typical surface finish for vacuum pump impellers?

A: A smooth finish (Ra ≤ 1.6μm) is standard to reduce gas adhesion and improve flow uniformity; super-finished surfaces (Ra ≤ 0.8μm) are available for ultra-high vacuum (UHV) systems.