What material should a globe valve for Chlorine (Cl₂) be?

Hastelloy C-276 (Excellent): Best all-round choice for both wet and dry service. PTFE (Excellent): Completely inert. Preferred for seats, seals, and lining. Carbon Steel (Good): Acceptable for dry chlorine gas and liquid. Passivates with iron chloride layer. PVC / FRP (Good): For wet chlorine at low pressure. Monel 400 (Good): Good for dry chlorine; not for wet.

Chlorine (Cl₂) service

Service Selection

Globe Valves for Chlorine (Cl₂) Service

Which globe valves configuration suits Chlorine (Cl₂) (Cl₂), in which material, to which standard — from real service data, with the pitfalls flagged.

Which globe valves for Chlorine (Cl₂)?

Forged globe valve - extended bonnet - Slow-opening design prevents surge in toxic gas service Typical service window: Up to 25 bar for liquid Cl₂, -34°C (liquid) to 120°C (gas).

Recommended Configurations

Forged globe valve - extended bonnet

Slow-opening design prevents surge in toxic gas service

Body Material for Chlorine (Cl₂)

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

Hastelloy C-276Best all-round choice for both wet and dry service.Excellent PTFECompletely inert. Preferred for seats, seals, and lining.Excellent Carbon SteelAcceptable for dry chlorine gas and liquid. Passivates with iron chloride layer.Good PVC / FRPFor wet chlorine at low pressure.Good Monel 400Good for dry chlorine; not for wet.Good SS 316LWet chlorine - not recommended due to Cl-SCC. Dry service - acceptable.Fair TitaniumRisk of titanium-chlorine fire at elevated temperature.Poor Copper alloysAttacked rapidly.Not Recommended

Governing Standards for Chlorine (Cl₂) Service

Chlorine Institute Pamphlet 6ASME B31.3 Category M (toxic service)ISO 15848 Class A (fugitive emissions)NFPA 72 (detection)

What to Avoid in Chlorine (Cl₂) Service

Valves with copper alloy trim or seals
Titanium-bodied valves in hot service
Rubber-seated valves (chlorine attacks most elastomers)

Service Considerations

Category M service per ASME B31.3 - zero leakage to atmosphere required
All maintenance requires SCBA and full PPE
Emergency isolation valve (EIV) with remote actuator required
Valve actuators must be pneumatic (spring-return fail-close) for toxic service
No organic lubricants on valve internals - use chlorinated or PTFE-based lubricant only