Amtrol 109 FILL-TROL Expansion Tank, 2.0 Gallon (109-1)

Amtrol 109 FILL-TROL Expansion Tank, 2.0 Gallon (109-1)The Amtrol FILL-TROL 109 Expansion Tank system consists of a specially adapted EXTROL pre-pressurized, diaphragm-type expansion tank,and the FILL-TROL, a specially designed, automatic, pressure-reducing fill valve. Provides accurate system make up Fully Adjustable up to a maximum working pressure of 100 psig Factory pre-charged to 12 psigAmtrol FILL-TROL 109 Expansion Tank Specifications: Model Number - 109 Tank Volume (Gallons) - 2.0 Max. Accept. Volume (Gallons) - 0.9 A Height (Inches) - 14-3/4 B Diameter (Inches) - 8 System Conn. (NPTF) - 1/2 Maximum Working Pressure = 100 PSIG Maximum Operating Temperature = 240F Factory Precharge = 12 PSIGHow the Amtrol FILL-TROL 109 Expansion Tank System Works:Water enters the FILL-TROL valve, pushing open the check valve, and flows into the heating system. The automatic shut-off valve is kept open by the diaphragm pressing against the pressure plate, raising the stem of the fill gate, which compresses the automatic shut-off valve spring. When the heating system reaches fill pressure (12 psig), the tank's diaphragm depresses, and the automatic shut-off valve is closed.Whenever system pressure falls below 12 psig, the automatic shut-off valve is pressed open by the diaphragm. Make-up water flows into the system to restore pressure.