The Cash Acme FV(M)X Series combination temperature and pressure relief valves are designed to offer high capacity protection for domestic and commercial water heating devices.The Cash Acme FV(M)X Series is fully automatic, and the valves reseat after either temperature or pressure relief. The FV(M)X Series Valves are diaphragm guided, and they are suitable for installations where codes require complete shut-off. The larger FV(M)X Series Valves are well suited for such commercial applications as restaurants, hospitals, and laundries.