Stainless Steel Diffuser for Multistage Pump

The Stainless Steel Diffuser for Multistage Pump is a high-efficiency fluid guidance component designed to convert velocity energy from impellers into pressure energy in multistage centrifugal pumps. Manufactured from corrosion-resistant stainless steels (304, 316L, 2205 duplex) or nickel-aluminum bronze (NAB) via investment casting or CNC machining, these diffusers feature symmetrical vanes and optimized flow passages to minimize turbulence and axial thrust.

Engineered for tight tolerances (±0.08mm) and balanced geometries, the diffusers meet API 610 and ISO 19951 standards, ensuring seamless integration with leading pump manufacturers’ multistage systems. Their modular design supports easy installation in both horizontal and vertical pump configurations.

The diffuser has a complex structure manufactured by lost-wax casting with silica sol technology. This helps us to achieve the critical dimension tolerance,narrow fluid passage and smooth casting surface, ensuring optimal fluid transfer performance and efficiency.

Hydraulic Performance Optimization: CFD-optimized vane angles (18-25°) and diffuser throat diameters reduce pressure pulsations by 15%, achieving up to 92% volumetric efficiency in clear water and 88% in low-solids slurries (≤2% solids by volume).

Axial Thrust Reduction: Symmetrical vane layouts and balanced flow distribution cancel out radial forces, reducing bearing loads by 70% compared to single-stage diffusers and extending pump life by 40%.

Corrosion & Erosion Resistance: 2205 duplex diffusers resist chloride stress corrosion in seawater (≥35,000 ppm Cl⁻), while NAB diffusers offer superior cavitation resistance in high-velocity flows (≥30 m/s), ideal for marine and offshore applications.

Material Customization: Electropolished 316L diffusers for food-grade applications, hardfaced (Stellite® 6) diffusers for abrasive media, and coated (PTFE) diffusers for sticky or polymer-based fluids.

This casting part is a diffuser, specifically designed for multistage pumps.By gradually expanding the flow area, the diffuser reduces the fluid's velocity while increasing its pressure, ensuring smooth and efficient fluid flow through the pump system. Additionally, the diffuser helps stabilize the flow and minimizes turbulence, contributing to the pump's overall performance and durability.

Diffusers are essential components in multistage pumps.These pumps  equipped with diffusers, are commonly applied in the water treatment industry, food industry, petrochemical industry, biopharmaceutical industry,construction industry,and shipbuilding industry,etc.

Water Supply Grids: Used in high-head multistage pumps for municipal water distribution, with 304 diffusers providing cost-effective corrosion resistance in chlorinated water (≤500 ppm Cl⁻).

Oil & Gas Industry: Deployed in deep-well injection pumps and offshore multistage systems, where 2205 duplex diffusers withstand high-pressure (200 bar/2,900 PSI) and high-temperature (250°C/482°F) seawater flooding.

Power Generation: Integral to boiler feed pumps in thermal power plants, handling superheated water (350°C/662°F, 180 bar/2,610 PSI) with NAB diffusers resisting cavitation erosion from rapid pressure changes.

Chemical Processing: Forms the core of multistage pumps for transferring viscous chemicals and polymers, with PTFE-coated diffusers reducing fluid adhesion and improving self-priming capabilities.

Q: How does the diffuser design affect pump head and efficiency?

A: Properly matched diffuser vane angles and throat area ensure efficient energy conversion, with each stage adding 50-150 meters of head depending on pump size and speed.

Q: Can these diffusers be used with non-stainless steel impellers?

A: Yes, but galvanic corrosion may occur. Using compatible materials (e.g., bronze impellers with NAB diffusers) or installing sacrificial anodes is recommended to prevent electrochemical reactions.

Q: What is the maximum operating temperature for 2205 duplex diffusers?

A: 2205 duplex maintains mechanical properties up to 300°C (572°F); for higher temperatures (300-600°C), Inconel 625 diffusers are recommended, though at a higher cost.