Tangential Air Separators

Rolairtrol Air Separator Hot & Chilled Water

The Bell & Gossett Rolairtrol® is a patented centrifugal style air separator for use in any HVAC system. Its 3-to-1 body diameter to nozzle diameter ratio slows the fluid velocity to help entrained air come out of solution, while its tangential inlet and outlet nozzles induces centrifugal fluid flow. This centrifugal flow creates a low pressure vortex in the center of the tank where entrained air can come out of solution and float to the top of the tank where it can easily be removed via an air vent or connection to an expansion tank.

The Rolairtrol is also available with or without a 304 stainless steel strainer to help break the fluid surface tension and remove suspended solids from your system fluid. Contaminants such as air and suspended sediment can lead to diminished heat transfer, higher energy costs, damage to your system components, and increased system noise. By removing them you can lower the cost to operate your system, extend the life of your components, and provide better comfort to your building occupants.

All Rolairtrol models are designed, constructed, inspected, and stamped per Section VIII, Division 1 of the ASME code for 125 psi (862 kPa) maximum working pressure and 350°F (177°C) maximum working temperature. Higher pressures and temperatures are available upon request. Models are available in sizes 2″ through 36″ and are available with NPT (2″ through 3” only), flange, or groove end connections.

Features and Benefits

Removes Entrained Air and Suspended Sediment

  • To protect the system against damage
  • To provide better heat transfer
  • To reduce energy costs
  • To eliminate system noise

Centifugal Flow Pattern

  • Creates low pressure vortex in center of tank
  • Lowers pressure drop through the tank

Models from 2″ – 36″

    • Cast iron (2” through 3”) and carbon steel (3” – 36”) bodies

-Other body materials available upon request for 3” – 36” models)

    • NPT (2″ & 2½″), flange, or groove connections available
    • With or without strainer

-304 stainless steel
-3/16” diameter perforations, 51% open area

Designed, constructed, inspected, and stamped per Section VIII, Division 1 of the ASME Code

  • Standard models rated for 125 psi (862 kPa) working pressure. Higher pressures available upon request
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ROLAIRTROL Air Separator

The ROLAIRTROL Air Separator

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General Selection Tools:

  • ESP-PLUS for B&G Centrifugal Pumps, Booster Pumps, Pump Accessories, and Air Separator
  • ESP-PARTS for replacement parts selection
  • ESP-TANKS Expansion tank selection
  • CAD Drawings for 2D and 3D dimensional drawings in many formats
  • ESP-PICV is a quick and easy way to size and select Ultra Setter Pressure Independent Control Valves using just their flow rate. It eliminates the need to sort through technical documents or catalogs to size the right control valves for your job. Simply enter your required flow rate and ESP-PICV shows you all of the Ultra Setter valves that can meet that flow. You can also find CAD models and valve submittals, and once you've made all of your selections click "Send" and you can request pricing from your local rep.

Heat Exchanger Product Selection

Steam + Water Pressure Reducing Values

Sizing Tools:

Report Bugs/Request Enhancements
Please email the following address to report issues and request enhancements: ebusiness.support@xyleminc.com

Consult your local Bell & Gossett Representative for additional assistance.