CSA/AM - ANSI Z21.22B-2001/CSA 4.4B-2001
Relief Valves for Hot Water Supply Systems
Organization: | CSA/AM |
Publication Date: | 1 September 2001 |
Status: | inactive |
Page Count: | 15 |
scope:
This standard applies to the following types of relief valves constructed
entirely of new, unused parts and materials:
a. Combination temperature and pressure relief valves for use on
storage tanks of hot water supply systems without heater input
limitation, hereinafter called "T&P" valves.
b. Valves having only pressure relief features for use on storage
tanks of hot water supply systems without heater input limitation.
c. Vacuum relief valves.
A T&P valve shall operate when the temperature sensing element is at 210
degrees F (99 degrees C) or less. A device with a higher operating
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