ULC 651

This Standard sets forth minimum requirements for emergency valves that are intended to be used for the control of flammable and combustible liquids which are handled at temperatures within the range of -40 °C to +50 °C. The valves are of the type used in motor fuel dispensing equipment and associated piping systems. Valves covered under these requirements are newly produced valves constructed entirely of new unused parts and materials. These requirements cover valves of the mechanically or temperature operated types or combinations of such to the exclusion of types operated wholly or partially by electricity. They may form a part of an assembly, which provides for additional functions of service, the requirements of which are outside the scope of this Standard.