Valves for Chlorine Dioxide (ClO₂) Service
Chlorine dioxide is a powerful oxidising biocide used in pulp and paper bleaching (replacing elemental chlorine), municipal drinking water treatment, and food plant sanitisation. It is generated on-site (never stored in large quantities due to explosion risk) at concentrations of 1–10 g/L. ClO₂ is an extremely aggressive oxidiser — more so than chlorine — attacking nearly all metals and many polymers. Valve and pipeline materials must be limited to titanium, PVDF, FRP, or PTFE-lined constructions.
Pressure Range
1–8 barg (generation and distribution)
Temperature
Ambient (5–40°C — ClO₂ is unstable at elevated temperature)
Industries
Pulp & paper bleaching, Municipal water treatment, Food plant sanitation
Key Properties — Chlorine Dioxide (ClO₂)
- Extremely aggressive oxidiser — more reactive than chlorine gas
- Yellow-green gas with characteristic pungent odour at >0.1 ppm — toxic and explosion risk
- Generated on-site only — never bulk stored (explosion/fire risk above 10% in air)
- Attacks CS, SS 304, SS 316, most rubbers, and many polymers
- Used at 1–10 g/L in pulp bleaching; <4 mg/L in water treatment
Material Compatibility — Chlorine Dioxide (ClO₂)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Titanium Gr 2 | Excellent | Best metallic choice for all ClO₂ concentrations. |
| PVDF | Excellent | Best polymer material — resistant to ClO₂ across all concentrations. |
| Hastelloy C-276 | Good | Acceptable for dilute ClO₂ service. |
| SS 316L | Poor | Pitting and SCC in ClO₂ — not recommended except for very dilute solution. |
| Carbon Steel | Not Recommended | Rapidly oxidised by ClO₂. |
Recommended Valves
PVDF-lined Butterfly Valve
Most commonly used for ClO₂ distribution in pulp bleaching and water treatment
PVDF-lined Ball Valve
Isolation and control of ClO₂ dosing — zero metal exposure to ClO₂
Titanium Ball/Butterfly Valve
For high-pressure or elevated-temperature ClO₂ service
Diaphragm Valve (PVDF body, PTFE diaphragm)
Precise dosing control in ClO₂ generation and distribution systems
Valves to Avoid
All carbon steel valves
SS 316 valves for concentrated ClO₂
NBR or EPDM-seated valves
Special Considerations
Applicable Standards
Shop Valves for Chlorine Dioxide (ClO₂) Service
Other Fluid Services
Need Valves for Chlorine Dioxide (ClO₂) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard.