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1.1 Scope 1.
1.1 This standard applies to the following types of relief valves constructed entirely of new, unused parts and materials: (a) Temperature relief valves and combination temperature and pressure relief valves for use
 

Document History

  1. CSA 4.4-2015/ANSI Z21.22-2015 (R2020)


    Relief Valves for Hot Water Supply Systems

    • Most Recent
  2. CSA ANSI Z21.22-99/CSA 4.4-M99 (R2014)


    Relief Valves for Hot Water Supply Systems

    • Historical Version
  3. CSA ANSI Z21.22-1999/4.4-M99

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    Relief Valves for Hot Water Supply Systems

    • Historical Version
  4. CSA ANSI Z21.22-1999


    Relief Valves for Hot Water Supply Systems

    • Historical Version
  5. ANSI Z21.22a-1990


    Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems

    • Historical Version