Caustic Soda (NaOH) service
Service Selection
Butterfly Valves for Caustic Soda (NaOH) Service
Which butterfly valves configuration suits Caustic Soda (NaOH) (NaOH), in which material, to which standard — from real service data, with the pitfalls flagged.
Which butterfly valves for Caustic Soda (NaOH)?
Rubber-lined butterfly valve - Large bore, low-pressure dilute NaOH systems Typical service window: 1–25 bar, Ambient to 130°C.
Recommended Configurations
Rubber-lined butterfly valve
Large bore, low-pressure dilute NaOH systems
Body Material for Caustic Soda (NaOH)
Rated from real compatibility data - click any material for the full decision page.
Governing Standards for Caustic Soda (NaOH) Service
What to Avoid in Caustic Soda (NaOH) Service
- Aluminium-bodied valves (any concentration)
- Zinc die-cast components
- SS 304/316 in hot caustic above 60°C
Service Considerations
- Heat tracing required where caustic may solidify in dead legs or low-flow areas
- Nickel alloys must be used for hot evaporator service
- All welds on CS in hot caustic must be stress-relieved per NACE SP0403
- Flushing connections required - caustic crystallises on exposed surfaces
Other valve types for Caustic Soda (NaOH)
Butterfly Valves for other services
Butterfly Valves for Sulphuric Acid (H₂SO₄)Butterfly Valves for Hydrochloric Acid (HCl)Butterfly Valves for SeawaterButterfly Valves for LNG / Cryogenic Natural GasButterfly Valves for Phosphoric Acid (H₃PO₄)Butterfly Valves for Nitric Acid (HNO₃)Butterfly Valves for Cooling WaterButterfly Valves for Brine / Sodium Chloride Solution
Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026
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