Service Selection

Gate Valves for Caustic Soda (NaOH) Service

Which gate valves configuration suits Caustic Soda (NaOH) (NaOH), in which material, to which standard — from real service data, with the pitfalls flagged.

Which gate valves for Caustic Soda (NaOH)?

Carbon steel gate valve - Ambient dilute caustic process service Typical service window: 1–25 bar, Ambient to 130°C.

Recommended Configurations

Carbon steel gate valve

Ambient dilute caustic process service

Body Material for Caustic Soda (NaOH)

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

Nickel 200/201Best all-round material for hot concentrated NaOH. Industry standard.Excellent PTFE-linedChemically inert to all NaOH concentrations.Excellent Carbon SteelAcceptable up to 50% NaOH at ambient temperature. Not for hot concentrated caustic.Good Monel 400Good for hot caustic service - preferred where Nickel 200 is cost-prohibitive.Good Rubber-lined (natural rubber/EPDM)Good up to 50% at ambient temperature.Good SS 316LRisk of caustic SCC above 60°C. Cold dilute service only - verify.Fair Aluminium alloysRapidly attacked at all concentrations.Not Recommended

Governing Standards for Caustic Soda (NaOH) Service

ASME B16.34 API 607 (fire safe)ISO 15848 (fugitive emissions)

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)

Globe Valves for Caustic Soda (NaOH)Ball Valves for Caustic Soda (NaOH)Butterfly Valves for Caustic Soda (NaOH)

Gate Valves for other services

Gate Valves for Hydrochloric Acid (HCl)Gate Valves for Chlorine (Cl₂)Gate Valves for Seawater Gate Valves for Crude Oil Gate Valves for Ammonia (NH₃)Gate Valves for LNG / Cryogenic Natural Gas Gate Valves for High-Pressure Steam Gate Valves for Carbon Dioxide (CO₂)

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

Connected Engineering

Standards

API 6D ASME B16.34 API 607 Fire-Safe

Materials

A216 WCB Carbon Steel

Failure Modes

Packing Blowout

Products

Gate Valves

Comparisons

Gate vs Ball Valve

Need gate valves for Caustic Soda (NaOH) service?

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Relevant Products

Vajra Gate Valves

Engineering references

Caustic Soda (NaOH) service guideFull compatibility, standards & considerations Vajra Gate ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ