What material should a check valve for Carbon Dioxide (CO₂) be?

SS 316L (Excellent): Standard for wet CO₂ or food-grade CO₂ service. Duplex 2205 (Excellent): CO₂ + H₂S service (EOR wells). Superior to 316L. PTFE (Excellent): Seals and seats - chemically inert to CO₂. Carbon Steel (Good): Dry CO₂ only. Wet CO₂ corrodes rapidly - specify corrosion inhibitor or upgrade material. EPDM (Good): More resistant to explosive decompression than NBR.

Carbon Dioxide (CO₂) service

Service Selection

Check Valves for Carbon Dioxide (CO₂) Service

Which check valves configuration suits Carbon Dioxide (CO₂) (CO₂), in which material, to which standard — from real service data, with the pitfalls flagged.

Which check valves for Carbon Dioxide (CO₂)?

Duplex check valve - EOR CO₂ injection - H₂S + CO₂ sour service Typical service window: 1–300 bar (beverage to CCS pipeline), -40°C (liquid CO₂) to 200°C (process).

Recommended Configurations

Duplex check valve

EOR CO₂ injection - H₂S + CO₂ sour service

Body Material for Carbon Dioxide (CO₂)

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

SS 316LStandard for wet CO₂ or food-grade CO₂ service.Excellent Duplex 2205CO₂ + H₂S service (EOR wells). Superior to 316L.Excellent PTFESeals and seats - chemically inert to CO₂.Excellent Carbon SteelDry CO₂ only. Wet CO₂ corrodes rapidly - specify corrosion inhibitor or upgrade material.Good EPDMMore resistant to explosive decompression than NBR.Good Nitrile (NBR)CO₂ causes explosive decompression in NBR at pressure cycling. Use HNBR or PTFE.Fair

Governing Standards for Carbon Dioxide (CO₂) Service

ASME B31.3 / B31.4 (dense-phase pipeline)DNV-RP-F104 (CCS CO₂ pipeline)ISO 23936 (non-metallic seals in CO₂)FDA 21 CFR 178 (food-grade CO₂)

What to Avoid in Carbon Dioxide (CO₂) Service

NBR-sealed valves in pressure-cycling CO₂ (explosive decompression)
Carbon steel in wet CO₂ without corrosion inhibitor
Copper alloys (marginal but not preferred)

Service Considerations

Explosive decompression of elastomers - test per ISO 23936
Dense-phase CO₂ ≥73.8 bar - valve body must handle liquid-like density
Depressurisation creates dry ice - ensure no blockage in valve body or downstream
CCS service: full traceability, welding inspection, and pigging capability

Other valve types for Carbon Dioxide (CO₂)

Ball Valves for Carbon Dioxide (CO₂)Gate Valves for Carbon Dioxide (CO₂)

Check Valves for other services

Check Valves for High-Pressure Steam 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)Check Valves for Oxygen (O₂ - Industrial and Medical Grade)

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

Connected Engineering

Materials

Super Duplex 2507

Products

Check Valves

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Relevant Products

Vajra Check Valves

Engineering references

Carbon Dioxide (CO₂) service guideFull compatibility, standards & considerations Vajra Check ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ