Grundfos Pump Suction Diffusers

Grundfos Suction Diffusers for Pump Suction Protection and Flow Conditioning

Combination Flow Straightener, Strainer, and Elbow for Cleaner Pump Suction and Space-Saving Installation

Grundfos Suction Diffusers are designed to improve flow conditions at the suction side of a pump while helping protect the pump from debris in the piping system. Used in commercial HVAC, hydronic heating and cooling, chilled water, condenser water, and mechanical room pump installations, suction diffusers help create a more uniform flow pattern entering the pump so the pump can operate more reliably and efficiently.

A suction diffuser combines several common pump suction-side components into one assembly. It can serve as an elbow, flow straightener, and strainer, helping reduce the need for long straight pipe runs and additional fittings ahead of the pump. The Series SD suction diffuser provides a uniform flow pattern to the suction side of the pump, helping ensure stable NPSH, and makes it possible to install pumps in narrow spaces where long bends are not practical.

Grundfos Suction Diffusers also incorporate a cylindrical strainer to help prevent impurities from entering the pump. This protects pump internals from startup debris, weld slag, pipe scale, and other particles that can damage impellers, seals, and wear surfaces. The diffuser also includes a disposable fine-mesh stainless steel startup screen for capturing foreign particulates during system startup and commissioning.

Features

• Pump suction diffuser design for commercial pump installations
• Provides a more uniform flow pattern to the suction side of the pump
• Helps support stable NPSH at the pump inlet
• Combines suction elbow, flow straightener, and strainer functions
• Helps reduce the need for long straight pipe runs before the pump
• Useful for compact mechanical room layouts and tight pump installations
• Cylindrical strainer helps prevent impurities from entering the pump
• Disposable fine-mesh stainless steel startup screen captures foreign particulates during startup
• Internal parts such as the strainer can be removed for service
• Adjustable support for mounting
• Designed for water applications
• ANSI 125 configuration available
• ANSI 250 configuration available
• Maximum pressure: 175 PSI for ANSI 125 configurations
• Maximum pressure: 250 PSI for ANSI 250 configurations
• Maximum liquid temperature: 150°F for ANSI 125 configurations
• Maximum liquid temperature: 248°F for ANSI 250 configurations
• Test pressure: 265 PSI for ANSI 125 configurations
• Test pressure: 426 PSI for ANSI 250 configurations

Applications

• Commercial HVAC pump systems
• Hydronic heating systems
• Hydronic cooling systems
• Chilled water systems
• Condenser water systems
• Boiler room pump piping
• Mechanical room pump installations
• Pump suction protection
  Pump suction flow conditioning
• End-suction pump installations
• Base-mounted pump systems
• Retrofit pump piping applications
• Compact mechanical room layouts