Full Description

Electrically Operated Valves

UL 429

1 Scope

1.1 These requirements cover electrically operated general purpose and safety valves rated 600 volts or less and intended for the control of fluids, such as air, gases, oils, refrigerants, steam, water, and the like. Electrically operated valves, other than automotive fuel valves, covered by these requirements are intended to be used in other than hazardous locations as defined by the National Electrical Code, NFPA 70.

1.2 These requirements also cover electrically operated valves intended to be factory installed on or in certain appliances as operating or safety controls.

1.3 These requirements cover valves whose coils are powered by a Class 2 (low-voltage) source. These include general purpose valves used with a nonflammable and nonhazardous fluid, general purpose valves used with a flammable or hazardous fluid and safety valves. Valves incorporating a high-voltage transformer with a low-voltage secondary as an integral part of the valve assembly, are also covered by these requirements.

1.4 These requirements do not cover valves for use in hydraulic fluid power systems.

1.5 These requirements do not cover automatic valves for gas appliances that are covered by the requirements in the Standard for Automatic Valves for Gas Appliances, ANSI Z21.21/CSA 6.5.

1.6 These requirements do not cover valves employing electrical parts, including coils, switch contacts and resistance elements, located in the flammable gas containing compartment of a valve. Valves constructed as such shall comply with the requirements in the Standard for Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations, UL 913.

Product Details

Edition: 6 Published: 11/11/2009 Number of Pages: 94