ASME Coded Safety Valves Valves are manufactured to ASME standards and certified by the national board of boiler and pressure vessel inspectors. Bubble tight to 10% of set pop-off pressure. Milton ASME safety valves are interchangeable with all other ASME valves of same size and pressure.  1/4 Male NPT 125 PSI Pop-0ff Pressure 120 CFM Air Flow Pop-Off PSI