hazardousNH₃CAS 7664-41-7
Valves for Ammonia (NH₃) Service
Ammonia is handled as a refrigerant (R-717), in fertiliser production, and as a chemical feedstock. It attacks copper alloys and zinc. For refrigeration systems, IIAR standards apply. Toxic (IDLH: 300 ppm) - requires leak-tight valve design.
Pressure Range
Up to 25 bar (refrigerant); up to 200 bar (synthesis gas)
Temperature
-33°C (liquid refrigerant) to 300°C (synthesis service)
Industries
Fertiliser / urea production, Cold storage / refrigeration, Chemical production
What valves are used for Ammonia (NH₃) service?
Carbon steel globe valve (IIAR-rated) are recommended for Ammonia (NH₃) service: IIAR standard for NH₃ refrigeration systems.
Key Properties - Ammonia (NH₃)
- IDLH: 300 ppm - toxic, requires gas detection
- Carbon steel is the primary material for liquid and gas ammonia
- Attacks copper, zinc, and their alloys
- Cryogenic liquid service: -33°C at atmospheric pressure
- Stress corrosion cracking of brass and copper alloys
Vajra Industrial Solutions manufactures and supplies valves for Ammonia (NH₃) service — including carbon steel globe valve (iiar-rated) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Ammonia (NH₃) service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Ammonia (NH₃)
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 |
|---|---|---|
| Carbon Steel (WCB/A105/A333 Gr.6) | Excellent | Standard for ammonia - both refrigerant and process service. |
| SS 304/316 | Good | Acceptable but not normally required. Used where contamination is a concern. |
| Copper alloys (brass, bronze) | Not Recommended | SCC and corrosion - strictly prohibited in ammonia service. |
| Zinc alloys / Die-cast zinc | Not Recommended | Attacked by ammonia - all zinc must be absent. |
| PTFE | Good | Acceptable for seats and seals. |
| Nylon | Not Recommended | Degraded by ammonia. |
| EPDM | Good | Acceptable for refrigerant ammonia seals. |
Recommended Valves
Carbon steel globe valve (IIAR-rated)
IIAR standard for NH₃ refrigeration systems
Full selection guideCarbon steel ball valve (low-temp rated A333)
Process ammonia isolation and control
Full selection guideCryogenic gate valve (extended bonnet)
Liquid ammonia -33°C storage - extended bonnet keeps packing at ambient
Full selection guidePressure relief valve (spring-loaded)
Critical safety device on all pressurised ammonia vessels
Full selection guideValves to Avoid
Any valve with copper, brass, or bronze wetted parts or body
Valves with zinc die-cast components
Nylon or polyamide-seated valves
Globe valves not rated for cryogenic temperatures in liquid NH₃ service
Special Considerations
Applicable Standards
Shop Valves for Ammonia (NH₃) Service
Other Fluid Services
Ammonia (NH₃) 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 Ammonia (NH₃) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.