Class 1 valves for liquid metal service

This standard establishes the requirements for throttle, isolation, and check valve assemblies for liquid metal service constructed in accordance with the Class 1 requirements of the ASME Boiler and Pressure Vessel Code, Section III, Division 1, Nuclear Power Plant Components, and special requirements that are additive or more restrictive. These valves are for applications in which the valve passes or stops the flow of liquid metal coolant in a nuclear reactor primary or secondary heat transfer system, or for other applications in which the valve is subject to severe operating conditions and where loss of function may impair the safety of the system in which the valve is installed. (U.S.)