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UL 429 Document Information:
Title
UL Standard for Safety Electrically Operated Valves
Underwriters Laboratories Inc.
Publication Date:
Nov 11, 2009
Scope:
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.
These requirements also cover electrically operated valves
intended to be factory installed on or in certain appliances as
operating or safety controls.
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.
These requirements do not cover valves for use in hydraulic
fluid power systems.
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.
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.
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