Duro Supply Co.

The Extrol Tank for Closed Hydronic Heating and Chilled Water Systems. The primary device in pressurizing and maintaining pressure control in a closed system is the hydro-pneumatic tank, also known, traditionally, as the expansion tank.

The Extrol hydro-pneumatic tank is available in diaphragm, full acceptance heavy-duty butyl bladder, and partial acceptance bladder designs in a broad range of sizes from 8 gallons (30 liters) to 3963 gallons (15,000 liters). Depending on the EXTROL HVAC Expansion tank model, maximum allowable working pressures up to 250 psi (17 bar) can be accommodated.

Through the use of a pneumatic cushion, the Extrol is designed to maintain a positive pressure on the HVAC system during all temperature excursions in the system's operating range. Your system and components are reliably protected.