HC22 American Standard Check Valve， a premium, corrosion-resistant non-return valve typically constructed from Hastelloy C22, designed to prevent backflow in highly aggressive chemical and industrial environments.
Description
HC22 American Standard Check Valve is engineered for service in environments where standard stainless steels fail. The “HC22” designation refers to its construction from Hastelloy C22 (Alloy C22), a versatile nickel-chromium-molybdenum-tungsten alloy known for its exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. Manufactured to strict ANSI/ASME standards, this valve provides a reliable one-way flow solution for systems handling wet chlorine, oxidizing acids, and other severe chemical media. Its robust design ensures a tight seal and long-term mechanical integrity under extreme thermal and chemical stress.
Features
- Automatic Response: The HC22 operates autonomously by relying on the kinetic energy of the flow. The valve discs open under forward pressure and close instantly via spring assistance or gravity when flow ceases, effectively preventing the reversal of pumps and drive motors.
- Dual-Plate Efficiency: The HC22 structure typically features two spring-loaded plates hinged on a central pin. This design offers a faster response time than traditional swing check valves and significantly reduces the risk of water hammer (pressure surges) during sudden shut-offs.
- Advanced American Standards: Designed and manufactured to meet API 594 (design), ASME B16.10 (face-to-face), and ASME B16.5 (flange) requirements. This ensures full technical compatibility with international projects in the oil, gas, and power sectors.
- Streamlined Flow Path: The internal geometry is optimized to provide a smooth flow path, which helps in minimizing pressure drop and turbulence, thereby maintaining overall system efficiency.
Specifications
| Feature | Specification |
| Design Standard | API 594 / ASME B16.34 |
| Connection Type | Wafer / Lug (Fits ASME B16.5 Flanges) |
| Face-to-Face | ASME B16.10 / API 594 |
| Pressure Class | Class 150, 300, 600, 900 |
| Body Materials | WCB, LCB, CF8, CF8M, Duplex, Hastelloy |
| Testing Standard | API 598 |
Applications
- Oil & Gas: Upstream production, refineries, and transmission pipelines.
- Chemical Processing: Handling of volatile liquids and gases in standardized ANSI piping.
- Power Plants: Condensate systems and cooling water loops where space is limited.
- Water Treatment: High-pressure pump stations and reverse osmosis (RO) systems.
