Diaphragm safety relief valve ASME 790

Bell & Gossett bronze ASME Safety Relief Valve Model 790 is designed to protect fired and unfired hot water vessels against overpressure conditions. Product Features Protect fired and unfired hot water vessels against overpressure conditions Highest BTUH rating for valves of similar size Feature a unique fail-safe disc Available in a wide range of pressure setting Bell & Gossett diaphragm-assist operated bronze ASME Safety Relief Valves are engineered in accordance with the requirements of Section IV of the ASME Boiler & Pressure Vessel Code for Heating Boilers, and their capacities are certified by the National Board of Boiler and Pressure Vessel Inspectors. The effective area of the EPDM diaphragm is approximately 5 times greater than some conventional “pop-type” relief valves. The diaphragms “oversized” effective area generates a greater operating force which helps to overcome the effects of fouling. Bell & Gossett ASME Safety Relief Valves feature a unique fail-safe disc with sufficient area to permit the valves to maintain their safety relief function in the event of a diaphragm rupture. The low differential between opening and closing pressures prevent conditions under which system water might flash into steam and cause hammering. Under normal operating conditions thermal expansion opens the valve allowing water to discharge at a low rate of flow. Under emergency conditions the valve will discharge its certified capacity. Bell & Gossett bronze body ASME Safety Valves offer the highest BTUH rating available in the marketplace for valves of their size.