UL 429
Standard for Electrically Operated Valves

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2009-11-11DOD Approved: 1989-08-10
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    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.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Undated references
            • 2.4 Automotive-fuel valve
          • 3 Glossary
        • CONSTRUCTION
          • 4 General
          • 5 Assembly
            • 5.1 All valves
            • 5.2 Safety valves
            • 5.3 Class 2 (low-voltage) valves
          • 6 Materials
            • 6.1 All valves
            • 6.2 General purpose valves for flammable and hazardous fluids, and safety valves
          • 7 Fluid Connections
          • 8 Seals and Stuff Boxes
          • 9 Springs
          • 10 Diaphragms
            • 10.1 All valves
            • 10.2 Flammable and hazardous fluid valves
          • 11 Operating Mechanisms
          • 12 Current-Carrying Parts
          • 13 Enclosures
            • 13.1 General
            • 13.2 Openings
            • 13.3 Accessibility of live parts
            • 13.4 Screens and expanded metal
            • 13.5 Rainproof, raintight, and watertight enclosures
            • 13.6 Corrosion protection
            • 13.7 Safety valves
          • 14 Field Wiring Connections
            • 14.1 General
            • 14.2 Leads
            • 14.3 Terminals
            • 14.4 Wiring space
          • 15 Internal Wiring
          • 16 Grounding
          • 17 Bonding
          • 18 Protection of Users and Service Personnel
          • 19 Transformers, Coils and Motors
          • 20 Switches
          • 21 Spacings
            • 21.1 General
            • 21.2 High-voltage circuits
            • 21.3 Low-voltage circuits – and low-voltage safety-control circuits
            • 21.4 Other than safety-control circuits
          • 22 Alternate Spacing – Clearances and Creepage Distances
          • 23 Separation of Circuits
            • 23.1 General
            • 23.2 Barriers
        • PERFORMANCE
          • 24 General
          • 25 Input Test
          • 26 Temperature Test
          • 27 Operation Test
            • 27.1 All valves
            • 27.2 Safety valves
          • 28 Torque Test
            • 28.1 All valves
            • 28.2 Safety valves
          • 29 External Leakage Test
          • 30 Seat Leakage Test
          • 31 Endurance Test
          • 32 Valve-Body Endurance Test
          • 33 Vibration Test – Safety Valves
          • 34 Hydrostatic Strength Test
          • 35 Valve-Body Distortion with Static Pressure Test
          • 36 Dielectric Voltage-Withstand Test
          • 37 Increased Potential Test
          • 38 Burnout Test
          • 39 Breakdown of Component Test
          • 40 Valve Body Distortion Test
          • 41 Rain Test
          • 42 Hosedown Test
          • 43 Metallic Coating Thickness Test
          • 44 Salt Spray Test
          • 45 Immersion-Volume Change Test
          • 46 Immersion-Extraction Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 47 General
        • ELECTRICAL RATINGS
          • 48 Details
          • 49 Valve-Body Impact Test
        • MARKINGS
          • 50 Details
          • 51 Cautionary Markings
          • 52 Visibility and Permanence of Markings
            • 52.1 General
            • 52.2 Unusual-condition exposure test
    • MARINE USE ELECTRICALLY OPERATED SHUT-OFF VALVES FOR FLAMMABLE LIQUIDS
    • APPENDIX A