5A American Standard Swing Check Valve is a premier industrial non-return valve engineered for extreme corrosive service and high-pressure applications. Constructed from 5A Super Duplex Stainless Steel (CE3MN) and designed in full accordance with API 6D and ASME B16.34, this valve provides elite protection for pumps and compressors in the most challenging offshore, chemical, and subsea environments.
Description
5A (ASTM A890 Grade 5A / CE3MN) represents the pinnacle of duplex alloy technology, offering significantly higher performance than standard stainless steels:
- Exceptional SCC Defense: The balanced ferritic-austenitic microstructure ensures immunity to chloride-induced stress corrosion cracking (SCC) in volatile environments.
- Elite Pitting Resistance: With a PREN (Pitting Resistance Equivalent Number) typically >40, 5A provides maximum protection against pitting and crevice corrosion in high-temperature seawater and acidic brine.
- Maximum Mechanical Strength: 5A super duplex offers superior yield strength and impact toughness, allowing the valve to withstand extreme pressure surges and mechanical fatigue.
Features
- Automatic Swing Mechanism: The valve utilizes a gravity-assisted swinging disc that rotates on an internal hinge pin. It opens fully with minimal forward pressure and closes instantly when flow ceases, preventing dangerous backflow.
- Full Port, Low Pressure Drop: The swing design allows the disc to move completely out of the flow stream, providing a straight-through flow path that minimizes turbulence and pressure loss—essential for high-efficiency pipeline operations.
- Advanced American Standards: Designed and manufactured to meet API 6D (pipeline valves), ASME B16.10 (face-to-face), and ASME B16.5 (flanges), ensuring global technical compatibility and safety.
- Stellite Hardened Sealing: The seat and disc sealing surfaces are typically reinforced with cobalt-based alloy (Stellite) welding to resist wear, erosion, and high-velocity fluid impact.
Specifications
| Feature | Specification |
| Design Standard | API 6D / ASME B16.34 |
| Flange Dimensions | ASME B16.5 Class 150/300/600 |
| Face-to-Face | ASME B16.10 |
| Body Material | 5A Super Duplex Steel (CE3MN / UNS J93404) |
| Pressure Class | Class 150, 300, 600, 900, 1500 |
| Temperature Range | -40°C to 250°C |
| Testing Standard | API 598 / API 6D |
Applications
- Offshore Oil & Gas: Seawater injection, firewater systems, and subsea production manifolds.
- Desalination: High-pressure reverse osmosis (RO) and concentrated brine handling.
- Chemical Processing: Handling of oxidizing acids, chlorides, and aggressive chemical slurries.
- Marine Engineering: Critical shipboard systems requiring maximum reliability and minimal maintenance.
