110121 | 790-30 790K Relief Valve | Bell & Gossett

790-30 790K Relief Valve

• Installed in systems to discharge water should excessive pressure develop
• Features an extra large relief diaphragm to assure positive action
• ASME Safety Relief Valves
• Protect fired and unfired hot water vessels against hazardous operating pressures.
• Engineered in accordance with Section IV of the ASME boiler and pressure code for heating boilers with capacities certified by the National Board of Boiler and Pressure Vessel Inspectors.
• Offer the highest BTUH ratings available on the market today for valves in their class (790,000 to 5,999,000 BTUH)
• EPDM diaphragm operated (cast iron models) and diaphragm assisted (bronze models) have an effective area approximately 5 times greater than conventional "pop-type" relief valves to help overcome the effects of fouling.
• Low differential between opening and closing pressures helps to prevent conditions under which system water might flash to steam and cause hammering
• Model 790 and 1170 Operating Data & Construction
• Maximum working pressure 125 PSIG (8.6 bar)