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Pressure relief valve requirements.

Municipal Code of Chicago § 18-29-606.5.9
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18-29-606.5.9 Pressure relief valve requirements. Each pressure relief valve shall be a minimum of 3/4 inch (20 mm) and shall be equipped with a test lever. In addition, an automatic vacuum relief valve shall be installed on such tanks with a 24-mesh screen of bronze or stainless steel. The area of the screening shall be 50 percent greater than the opening it serves. All equipment of a hydropneumatic system shall be capable to withstand the designed working pressure. Exception: This section shall not apply to pressurized captive air diaphragm/bladder tanks.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2691686Fetched: 10/24/2026

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