U.S. exports of Safety or Relief Valves (SITC 74740) totaled $67.1M in August 2026.
Importers of Safety or Relief Valves paid $4.2M in duties in August 2026, an average duty rate of 10.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataSafety and relief valves are pressure-protection devices mandated by boiler, pressure-vessel, and process-safety codes — including ASME and API standards — to vent excess pressure before equipment failure occurs. Their import classification under SITC 74740 is closely tied to the application: spring-loaded safety valves for steam service, pilot-operated relief valves for process lines, and rupture-disk assemblies each occupy distinct commercial niches. Because these valves are often required to carry third-party certification (such as ASME UV or NB stamps), importers should confirm that foreign-manufactured units meet the applicable code stamp requirements accepted by US jurisdictions.
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3.5K import shipments a month
Many US jurisdictions and insurance underwriters require that pressure-relief devices on boilers and unfired pressure vessels bear an ASME UV or UD stamp, or equivalent National Board certification. Importers should verify with the end-user's engineering team and the relevant state boiler inspection authority before purchasing uncertified foreign units.
For SITC purposes, both types fall under 74740. At the HTS level, classification generally hinges on body material and pressure rating rather than on the safety-vs-relief functional distinction. However, the technical difference matters commercially: safety valves open fully and quickly (typically for gas/steam service), while relief valves modulate opening proportionally to overpressure (common in liquid service).
Basic heading 136 of 642 in section 7
Basic heading 74740 · $67.1M of $76.2B
ImportsExports
Imports
$39.7MYoY · free account
Exports
$67.1MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $476.5M of Safety or Relief Valves.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.
Exports · August 2026
destination
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
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