What material should a check valve for Carbon Monoxide (CO) be?

Carbon Steel (Excellent): Standard for most CO service. PWHT required for weld-end valves. SS 316L (Good): Acceptable for CO service; avoid where nickel content is a concern for Ni(CO)₄ formation.

Carbon Monoxide (CO) service

Service Selection

Check Valves for Carbon Monoxide (CO) Service

Which check valves configuration suits Carbon Monoxide (CO) (CO), in which material, to which standard — from real service data, with the pitfalls flagged.

Which check valves for Carbon Monoxide (CO)?

Check Valve - Compressor protection on CO discharge lines Typical service window: 0.1–350 barg, Ambient to +900°C (blast furnace/reformer).

Recommended Configurations

Check Valve

Compressor protection on CO discharge lines

Body Material for Carbon Monoxide (CO)

Rated from real compatibility data - click any material for the full decision page.

Carbon SteelStandard for most CO service. PWHT required for weld-end valves.Excellent SS 316LAcceptable for CO service; avoid where nickel content is a concern for Ni(CO)₄ formation.Good Hastelloy C-276High nickel content - same Ni(CO)₄ risk as above. Verify with process chemist.Fair Nickel alloys (Inconel, Monel)Nickel carbonyl formation above 150°C - avoid in high-CO partial pressure service.Poor

Governing Standards for Carbon Monoxide (CO) Service

ASME B16.34 API 600API 941 (HTHA - for co-present H₂)ASME B31.3

What to Avoid in Carbon Monoxide (CO) Service

Nickel-base alloy valves in high CO partial pressure above 150°C
Non-PWHT welded valves in CO service

Service Considerations

CO gas detection system with 25 ppm alarm in all CO-containing areas - odourless, immediately lethal
Avoid nickel-base trim above 150°C in high-CO partial pressure - nickel carbonyl risk
All CO vents and drains must terminate at flare - CO must never be vented to atmosphere
PWHT mandatory for welded carbon steel valves in CO service

Other valve types for Carbon Monoxide (CO)

Gate Valves for Carbon Monoxide (CO)Ball Valves for Carbon Monoxide (CO)Globe Valves for Carbon Monoxide (CO)Safety & Relief Valves for Carbon Monoxide (CO)

Check Valves for other services

Check Valves for High-Pressure Steam Check Valves for Carbon Dioxide (CO₂)Check Valves for Diesel Fuel / Fuel Oil Check Valves for Cooling Water Check Valves for Methanol (Methyl Alcohol)Check Valves for Hot Oil (Thermal Heat Transfer Fluid)Check Valves for MEG / Glycol (Monoethylene Glycol - Gas Dehydration)Check Valves for Demineralised Water (DM Water / Deionised Water)

Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026

Connected Engineering

Standards

ASME B16.34

Products

Check Valves

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Relevant Products

Vajra Check Valves

Engineering references

Carbon Monoxide (CO) service guideFull compatibility, standards & considerations Vajra Check ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ