corrosiveNaOClCAS 7681-52-9
Valves for Sodium Hypochlorite (NaOCl - Bleach) Service
Sodium hypochlorite (NaOCl) is used as a disinfectant and bleaching agent in water treatment (typically 0.5–2 mg/L dosing), swimming pools, pulp bleaching (10–15% solution), and textile bleaching. Concentrated NaOCl (>10%) is highly corrosive and a strong oxidiser, attacking most metals. Even dilute hypochlorite causes pitting corrosion on SS 304 and attacks carbon steel rapidly. Valve materials must be carefully selected to avoid metal ion contamination and premature failure.
Pressure Range
1–10 barg (dosing and distribution)
Temperature
Ambient (max 25°C for storage stability)
Industries
Water treatment & disinfection, Swimming pools, Pulp & paper bleaching
What valves are used for Sodium Hypochlorite (NaOCl - Bleach) service?
PVDF-lined Butterfly Valve are recommended for Sodium Hypochlorite (NaOCl - Bleach) service: Most cost-effective large-bore isolation for concentrated NaOCl in water treatment and pulp bleaching.
Key Properties - Sodium Hypochlorite (NaOCl - Bleach)
- Strong oxidiser - highly corrosive to most common metals including CS and SS 304
- 10–15% NaOCl solution pH ~11–13: alkaline but corrosive due to hypochlorite ion
- Decomposes on heating and in sunlight - maximum storage temperature 25°C
- Active chlorine content degrades over time - fresh solution most aggressive
- Releases Cl₂ gas when acidified - HVAC hazard in enclosed pump rooms
Vajra Industrial Solutions manufactures and supplies valves for Sodium Hypochlorite (NaOCl - Bleach) service — including pvdf-lined butterfly valve — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
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Material Compatibility - Sodium Hypochlorite (NaOCl - Bleach)
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 |
|---|---|---|
| SS 316L | Fair | Acceptable for dilute (<1%) service only. Not for concentrated hypochlorite. |
| Hastelloy C-276 | Excellent | Best metallic choice for concentrated NaOCl. |
| Titanium Gr 2 | Excellent | Excellent resistance to hypochlorite. |
| PVDF-lined | Excellent | Best plastic-lined option for all NaOCl concentrations. |
| Carbon Steel | Not Recommended | Rapidly corroded by any NaOCl concentration. |
| Bronze / Brass | Not Recommended | Copper is oxidised by hypochlorite - releases Cu ions contaminating treated water. |
Recommended Valves
PVDF-lined Butterfly Valve
Most cost-effective large-bore isolation for concentrated NaOCl in water treatment and pulp bleaching
Full selection guideDiaphragm Valve (PVDF or PP body, PTFE diaphragm)
Accurate dosing control of hypochlorite - zero metal contact, no dead legs
Full selection guideHastelloy C-276 Globe Valve
Control service where metallic valve is required for high-pressure hypochlorite
Full selection guideValves to Avoid
Carbon steel valves
Bronze or brass valves - copper contamination
SS 316 for concentrated NaOCl
Special Considerations
Applicable Standards
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Other Fluid Services
Sodium Hypochlorite (NaOCl - Bleach) Service — Procurement & Specification
Typical Applications
Available Standards
Material Options
Documentation Available
- -EN 10204 3.1 Material Test Certificates (heat traceable)
- -API 598 hydrostatic shell & seat test reports
- -Dimensional inspection reports
- -Full Manufacturing Data Record (MDR) / data book on request
Inspection Options
- -In-house QC inspection on every order
- -Third-party inspection (SGS / Bureau Veritas / TÜV / DNV) coordination
- -Witness and hold points accommodated on request
Order Quantities
Flexible — from single critical-spare valves to full project lots.
Export
Worldwide export with complete documentation (COO, EUR.1, packing lists) to 20+ countries.
Custom Engineering
Built to your specification — materials, trim, pressure class and special service (NACE, fire-safe, IBR, cryogenic).
Delivery Support
Dispatch from Vadodara, Gujarat with documented lead times and priority handling for urgent requirements.
Engineering references
Connected Engineering
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