Description
The Amtrol SX40V Floor Mount Expansion Tank is a 1-inch NPTF connection unit identified as model 118-78, used to absorb thermal expansion of water and maintain stable system pressure in HVAC systems. It accepts excess water volume as temperature rises, preventing pressure buildup within closed hydronic heating or chilled water circuits. It operates through a diaphragm design that separates air and water, allowing pressure changes to be controlled without direct mixing. Positioned within boiler or hydronic piping networks, it interfaces with system loops to manage expansion volume and support balanced system pressure control.
