Armstrong Inline Circulators

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 rotating assembly which consists of the housing, pump shaft and bearings, mechanical seal and 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.