utilityN₂ / O₂ mixture
Valves for Compressed Air Service
Compressed air is the most widely used utility in industrial plants - powering pneumatic actuators, instruments, tools, conveying systems, and process air injection. Though non-toxic and non-flammable, compressed air requires careful valve selection for moisture content, oil contamination, and pressure class.
Pressure Range
5–10 bar (instrument/plant air); up to 40 bar (high-pressure air)
Temperature
Ambient to 60°C (post-cooler discharge)
Industries
All industrial plants (utility), Pneumatic instrument systems, Pharmaceutical cleanrooms
What valves are used for Compressed Air service?
Ball Valve (full-bore, SS or brass body) are recommended for Compressed Air service: Low pressure drop, fast operation, suitable for all air pressures and instrument air..
Key Properties - Compressed Air
- Operating pressure: 5–10 bar for instrument air; up to 40 bar for high-pressure air
- Always contains some moisture - risk of corrosion and hydrate formation below dew point
- Instrument air: oil-free, dry (dew point ≤−40°C); plant air: may contain condensate
- Non-flammable at ambient oxygen concentration
- High flow velocity in small lines - velocity noise and erosion risk
Vajra Industrial Solutions manufactures and supplies valves for Compressed Air service — including ball valve (full-bore, ss or brass body) — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Compressed Air service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Compressed Air
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) | Good | Suitable for dry compressed air. Corrodes in wet air - use coated internals for humid service. |
| SS 316 | Excellent | Ideal for instrument air and pharmaceutical compressed air. |
| Ductile Iron / Cast Iron | Good | Standard for general plant air at PN 10/16. |
| Brass / Bronze | Excellent | Traditional material for compressed air fittings and small-bore valves. |
| Aluminium | Good | Used in lightweight instrument air fittings; avoid in wet air with chlorides. |
Recommended Valves
Ball Valve (full-bore, SS or brass body)
Low pressure drop, fast operation, suitable for all air pressures and instrument air.
Full selection guideButterfly Valve (wafer, DI or aluminium)
Large-bore plant air distribution headers - low cost, compact.
Full selection guideNeedle Valve (SS 316)
Instrument air isolation on control valve positioners and pressure transmitters.
Full selection guideSolenoid Valve (3/2 or 5/2 way)
Directional control for pneumatic actuator supply and exhaust.
Valves to Avoid
Cast iron valves in instrument air service (risk of internal corrosion contaminating air supply)
Large-bore butterfly valves in pulsating or compressor discharge service without surge analysis
Plastic-bodied valves above 10 bar or in environments where UV degradation is a risk
Special Considerations
Applicable Standards
Shop Valves for Compressed Air Service
Other Fluid Services
Compressed Air 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 Compressed Air Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.