UL 1478A
Standard for Pressure Relief Valves for Sprinkler Systems

DETAILS
Edition Number:1SCC Approved:--
Edition Date:2013-05-20DOD Approved: --
Price Code:AANSI Approved: 2017-08-04
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover pressure relief valves intended for use in sprinkler systems for fire protection service to relieve excessive pressures caused by thermal expansion, downstream of a pressure reducing valve or in valve trim.


    Section 1 effective May 20, 2015

    1.2 Requirements for installation of these valves are included in the Standard for the Installation of Sprinkler Systems, NFPA 13.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Glossary
        • CONSTRUCTION
          • 5 Sizes
          • 6 Use and Set Pressure
          • 7 Materials
        • PERFORMANCE
          • 8 General
          • 9 Elastomeric Parts (Except Gaskets) Test
          • 10 Leakage Test
          • 11 Hydrostatic Strength and Body Leakage Test
          • 12 Relief Valve Operation, Flow Capacity and Reseat Tests
          • 13 Spring Cycling Test
          • 14 Contaminated-water Cycle Test
          • 15 10-Day Moist Ammonia Air Stress Cracking Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 16 General
        • MARKING
          • 17 General
        • INSTRUCTIONS
          • 18 General