Piping Class A4A
Piping Class Spec

Check Valves — Piping Class A4A

The check valves specification for piping class A4A (ASME Class 900, Very High Pressure - HP Gas Injection, HP Wellhead, Sour Gas to 148 bar) — body, trim, seat, end connection and rating, ready to quote.

What is the check valves spec for piping class A4A?

Piping class A4A (ASME Class 900) covers Very High Pressure - HP Gas Injection, HP Wellhead, Sour Gas to 148 bar with a Carbon Steel ASTM A216 WCB / A105N Forged body material and 3mm corrosion allowance, rated for 148 bar (2149 psi) at Up to 400°C (752°F). The check valves specification for this class is below.

TypeRatingBodyTrimSeatEnd Conn.
Check ValveClass 900A216 WCBStellite-6 HFStellite-6 HFRTJ Flange
  • -Check Valve: Tilting disc or piston lift; pressure-seal cover

Vajra Check Valves

Non-return valves to prevent backflow and protect equipment in piping systems.

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Other valves in piping class A4A

Gate Valves — A4AGlobe Valves — A4ABall Valves — A4ANeedle Valves — A4A

Check Valves in other piping classes

Check Valves — A1ACheck Valves — A2ACheck Valves — A3ACheck Valves — B1ACheck Valves — B2ACheck Valves — C1ACheck Valves — D1ACheck Valves — E1ACheck Valves — A5ACheck Valves — A6A
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A216 WCB Carbon Steel
Products
Check Valves

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Vajra Check Valves

Engineering references

Piping Class A4AFull valve schedule & specPiping Class Quick ReferenceAll classes comparedVajra Check ValvesFull range, specs & standards