---identifier: "/us/cfr/t46/s153.368"source: "ecfr"legal_status: "authoritative_unofficial"title: "46 CFR § 153.368 - Pressure-vacuum valves."title_number: 46title_name: "Shipping"section_number: "153.368"section_name: "Pressure-vacuum valves."chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"subchapter_number: "O"subchapter_name: "CERTAIN BULK DANGEROUS CARGOES"part_number: "153"part_name: "SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS"positive_law: falsecurrency: "2026-04-05"last_updated: "2026-04-05"format_version: "1.1.0"generator: "[email protected]"authority: "46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1. Section 153.40 issued under 49 U.S.C. 5103. Sections 153.470 through 153.491, 153.1100 through 153.1132, and 153.1600 through 153.1608 also issued under 33 U.S.C. 1903 (b)."regulatory_source: "CGD 73-96, 42 FR 49027, Sept. 26, 1977, unless otherwise noted."cfr_part: "153"---
Identifier
/us/cfr/t46/s153.368
Currency
2026-04-05
Positive Law
No
Updated
2026-04-05
Chapter
Coast Guard, Department of Homeland Security
Authority
46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1. Section 153.40 issued under 49 U.S.C. 5103. Sections 153.470 through 153.491, 153.1100 through 153.1132, and 153.1600 through 153... 46 U.S.C. 3703; Department of Homeland Security Delegation No. 0170.1. Section 153.40 issued under 49 U.S.C. 5103. Sections 153.470 through 153.491, 153.1100 through 153.1132, and 153.1600 through 153.1608 also issued under 33 U.S.C. 1903 (b).
# 153.368 Pressure-vacuum valves.(a) The pressure side of a required pressure-vacuum relief valve must begin to open only at a pressure exceeding 3.5 kPa gauge (approx. 0.5 psig).(b) A pressure-vacuum relief valve must meet the requirements of Subpart 162.017 of this chapter.