Historical
ANSI Z21.22b-2001
Relief Valves for Hot Water Supply Systems (same as CSA 4.4b)
Details test and examination criteria for: (1)Temperature relief valves and combination temperature and pressure relief valves for use on storage tanks of hot water supply systems without heater input limitation; (2) Valves having only pressure relief features for use on storage tanks of hot water supply systems with inputs up to and including 200,000 Btu per hour; (3)Vacuum relief valves.
CONTENT PROVIDER
CSA America, Inc. [csa]
CSA America, Inc. [csa]