The F-82 is a pressure-only ASME safety relief valve designed for use on hot water space heating boilers, water supply heaters and storage tanks. The F-82 Safety Relief Valves are designed for use on hot water service only and are not to be used on steam. The F-82 Series Valves are completely automatic with the valves resetting after pressure relief, making them ideal for most domestic water heater applications. Cash Acme, a trusted history. An innovative future.