Piping Class Reference
Piping Class A6A Valve Specification
Piping Class A6A covers ASME Class 2500 — the highest standard ASME pressure class, for extreme-pressure service on HP wellheads, HP test equipment, HP hydraulic power units (HPU), and certain refinery HP catalytic reformer circuits. Class 2500 valves above DN50 are almost exclusively butt-welded to eliminate all flange connections. Below DN50, SW and NPT forged valves in A182 F22 or F316L are typical. Vajra Industrial Solutions supplies Class 2500 forged gate valves, globe valves, needle valves, and ball valves for HP wellhead test systems and HP hydraulic circuits. All Class 2500 valves supplied with pressure-seal bonnets, API 598 shell test at 1.5× CWP, full material traceability per EN 10204 3.1/3.2, and PMI (Positive Material Identification) reports. Export crating and insurance documentation available for offshore and international projects.
ASME Class
ASME Class 2500
Design Pressure
412 bar (5975 psi)
Design Temperature
Up to 400°C (752°F)
Body Material
Carbon Steel ASTM
Design Parameters — A6A
Fluid Service
Extreme High Pressure — Ultra-HP Wellhead, HP Instrument & Test Systems to 412 bar
Design Pressure
412 bar (5975 psi)
Design Temperature
Up to 400°C (752°F)
Corrosion Allowance
3mm
Body Material
Carbon Steel ASTM A216 WCB / A182 F22 Forged (2¼Cr-1Mo)
Industries
Ultra-HP wellhead systems, HP hydraulic power units (HPU)
Valve Schedule — Piping Class A6A
| Valve Type | Rating | End Connection | Body Material | Trim | Seat/Sealing | Notes |
|---|---|---|---|---|---|---|
| Gate Valve | Class 2500 | BW (ASME B16.25) or RTJ (ASME B16.5) — small bore only | A216 WCB / A182 F22 | Stellite-6 HF overlay | Stellite-6 HF | API 600, pressure-seal bonnet, OS&Y; butt-weld preferred |
| Globe Valve | Class 2500 | BW or RTJ | A216 WCB / A182 F22 | Stellite-6 HF | Stellite-6 HF | Y-pattern for minimum pressure drop; pressure-seal bonnet |
| Ball Valve | Class 2500 | BW or RTJ (small bore) | A182 F22 Forged / WCB | Inconel 625 ENP + TC | Metal seat (TC / ENP) | API 6D, trunnion, DBB; available DN15-DN200 |
| Needle Valve | Class 2500 | NPT/SW forged | A182 F22 / F316L Forged | SS 316 / Alloy 625 | SS 316 hardened | HP instrument root valve; HP block & bleed manifold |
| Check Valve | Class 2500 | BW or RTJ | A216 WCB / A182 F22 | Stellite-6 HF | Stellite-6 HF | Piston lift type; low volume, extreme pressure |
Typical Industries — A6A
Standard Certifications for A6A Valves
Shop Valves for Piping Class A6A
Related Piping Classes
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