Home › CFR › Title 49 › Part 179 › §179.220-2449 CFR §179.220-24 — -24 Tests of pressure relief valves.Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkEach safety relief valve must be tested by air or gas for compliance with § 179.15 before being put into service.