hazardousHFCAS 7664-39-3
Valves for Hydrofluoric Acid (HF) Service
Hydrofluoric acid is one of the most hazardous industrial chemicals. Even dilute HF can cause deep tissue burns and systemic fluoride poisoning through skin contact. Refinery alkylation units use concentrated HF or sulphuric acid. Valve specifications follow CCPS and API 751 guidelines.
Pressure Range
1–20 bar
Temperature
Ambient to 70°C
Industries
Petroleum refining (alkylation), Semiconductor etching, Fluorochemical production
What valves are used for Hydrofluoric Acid (HF) service?
Monel 400 globe valve (NACE MR0175) are recommended for Hydrofluoric Acid (HF) service: HF alkylation unit - API 751 compliant design.
Key Properties - Hydrofluoric Acid (HF)
- Penetrates skin - causes deep tissue damage and systemic toxicity
- IDLH: 30 ppm (immediately dangerous to life)
- Attacks glass and many ceramics (used for etching)
- Anhydrous HF is a gas above 19.5°C - requires pressure vessels
- Refinery alkylation uses anhydrous or concentrated aqueous HF
Vajra Industrial Solutions manufactures and supplies valves for Hydrofluoric Acid (HF) service — including monel 400 globe valve (nace mr0175) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Hydrofluoric Acid (HF) service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Hydrofluoric Acid (HF)
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 |
|---|---|---|
| Monel 400 (N04400) | Excellent | Industry standard for HF alkylation service. Resists anhydrous and aqueous HF. |
| Carbon Steel | Good | Forms iron fluoride passivation layer. Acceptable for anhydrous HF and high concentrations. Not for dilute aqueous HF. |
| SS 304/316 | Not Recommended | Not acceptable for HF service - corrosion and SCC risk. |
| PTFE | Good | Acceptable for aqueous HF up to ~50% at ambient. Fuming HF attacks PTFE at elevated temperature. |
| Hastelloy C-276 | Fair | Only for dilute aqueous HF - not for anhydrous or hot concentrated HF. |
| Nickel 200/201 | Good | Good for aqueous HF in some concentration ranges. |
Recommended Valves
Monel 400 globe valve (NACE MR0175)
HF alkylation unit - API 751 compliant design
Full selection guideBellows-sealed globe valve
Zero fugitive emission design - HF is lethal at low concentrations
Full selection guideESD valve with remote actuator
Remote operation mandatory - no manual operation in HF area
Valves to Avoid
SS 304 or SS 316 in any HF service
Non-fire-safe or non-bellows-sealed valves
Any valve with glass or ceramic components
Valves not rated for Category M lethal service
Special Considerations
Applicable Standards
Shop Valves for Hydrofluoric Acid (HF) Service
Other Fluid Services
Hydrofluoric Acid (HF) 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
Need Valves for Hydrofluoric Acid (HF) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.