Armstrong Inline Pump Identification

Armstrong inline circulators are considered 3 piece pumps.

The 3 main parts are the power pack which consists of the motor and motor mount.

The next part is the bearing assembly which consists of the housing, pump shaft and bearings, mechanical seal and may or may not include the impeller.

 The last part is the volute. The volute is the part of the pump that connects to the water piping. On a closed system such as a heating or chilling system it can be cast iron since the water is treated for corrosion control. If it is used for domestic hot water it should be made of bronze to prevent the volute from rusting since the water will not contain any chemical treatment.

  Armstrong makes 6 different bearing assemblies and several different size impellers. The impeller is the main componet of the pump. The motor and bearing assembly are a means to turn the impeller. The same bearing assembly and or motor can be used on several different  size pumps. This makes pump identification very difficult. Motor RPM, horsepower, frame size, bolt dimensions, volute flanges, width between flanges are all things that are used to help identify a pump when the original nomenclature is missing.

About Us

Welcome to Shortys Pumps, a division of HVAC Supplies. We are located on the South West side of Indianapolis, IN. Our purpose is to provide Original Equipment Manufacturer parts for the repair and maintenance upkeep of furnaces, air conditioners, ventilation systems and pumps to the general public as well as contractors and commercial building maintenance staff.

Give us a call with the information from your equipment nameplate and we will do our best to help you locate the right paty. We can be reached at our local phone number 317-821-8770, Toll Free 877-821-8770 or by fax at 317-821-8772. Our business hours are 8-5 EST M-F. Prior to making repairs please check your manufacturers instructions and follow all safety precautions. Improper repairs can lead to equipment damage or personal injury or death. If you are unsure of your ability please call a professional to service your equipment.




Company Name

Shortys Pumps, division of Shortys HVAC Supplies


7720 S Mooresville RD
West Newton, IN
USA 46183

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Shortys Pumps, division of Shortys HVAC Supplies 2024