Description A.Y. McDonald Diaphragm Pressure Tank - Vertical, 16-119 Gal Baker Water Systems DuraMac Vertical Diaphragm Pressure Tank. For hydro-pneumatic systems, booster systems, irrigation systems, and reduction of water hammer effects. 16“34 gallon models equipped with nylon base and 1" FNPT 90° elbow. 34“119 gallon models equipped with 1-1/4" FNPT 90° elbow; 86 and 119 gallon models have a metal base. Factory pre-charged at 40 PSI (2“26 gallon) or 45 PSI (32“119 gallon). 100% factory tested. Technical Details Fixed butyl membrane Stainless-steel water connection Internal lining in polypropylene Finished with polyurethane paint on epoxy base Air valve plug sealed with O-ring No maintenance required Maximum working pressure: 150 PSI Maximum working temperature: 194°F NSF 61, R&T, ACS, CE certifications Factory pre-charged 40 PSI (16“26 gal) / 45 PSI (32“119 gal) 100% factory tested 16“32 gal: 1" FNPT 90° elbow | 34“119 gal: 1-1/4" FNPT 90° elbow How It Works Start-Up Cycle With water chamber empty, diaphragm is pressed against bottom of chamber. Fill Cycle As water is pumped into water chamber, diaphragm is forced upward into air chamber. Hold Cycle When pressure in air chamber reaches pump cut-off point, diaphragm is in uppermost position, water chamber is filled to rated capacity. Delivery Cycle When water is delivered to system, pump remains shut off. Air pressure in top chamber forces diaphragm downward. Datasheets Pressure Tanks Guide
