2205 Duplex Stainless Steel Wafer Check Valve is a high-performance, automatic backflow preventer designed for compact installations in corrosive environments. By utilizing 2205 Duplex steel and a space-saving wafer design, this valve provides exceptional mechanical strength and superior resistance to chloride-induced stress corrosion cracking (SCC), making it an ideal choice for the chemical, marine, and oil and gas industries.
Description
2205 (UNS S32205 / 022Cr22Ni5Mo3N) offers a unique combination of ferritic and austenitic properties:
- Chloride Resistance: Excellent resistance to pitting and crevice corrosion, particularly in brine and seawater applications.
- Mechanical Integrity: Superior fatigue strength and lower thermal expansion than traditional 300-series stainless steels.
- High Strength: Approximately double the yield strength of standard austenitic stainless steels, allowing for a robust yet lightweight valve construction.
Features
- Automatic Backflow Prevention: Operates purely on pressure differential. The valve opens with forward flow and closes instantly when the flow stops or reverses, protecting upstream equipment like pumps and compressors.
- Compact Wafer Structure: The thin, “wafer” profile fits securely between two piping flanges. This design significantly reduces the valve’s footprint and total weight, simplifying installation and reducing shipping costs.
- Hardened Sealing Surfaces: The seat and disc sealing surfaces are built up with cobalt-based alloy (Stellite) welding. This provides extreme resistance to wear, erosion, and high-temperature oxidation, ensuring a long service life.
- Reliable Shut-off: Manufactured and tested in full accordance with GB/T 12235 (National Standard), ensuring dependable sealing and fine performance under varied pressure conditions.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12235 / API 594 |
| Connection Type | Wafer (Fits between ANSI or GB flanges) |
| Face-to-Face | GB/T 12221 / API 594 |
| Body Material | 2205 Duplex Steel (UNS S32205 / CD3MN) |
| Pressure Rating | PN16, PN25, PN40, PN64 / Class 150, 300 |
| Sealing Material | Metal-to-Metal (Stellite) or Resilient (optional) |
| Testing Standard | GB/T 13927 / API 598 |
Applications
- Marine & Offshore: Seawater cooling systems, desalination plants, and offshore platforms.
- Chemical Processing: Handling of organic acids and chloride-bearing chemical streams.
- Water Treatment: Protecting high-pressure pumps in reverse osmosis (RO) systems.
- Petrochemical: Refineries and industrial pipelines requiring robust backflow protection in compact spaces.
