C4 National Standard Flange Ball Valve is a specialized solution engineered for the most aggressive oxidizing environments. Utilizing C4 (High-Silicon Austenitic Stainless Steel) and adhering to GB/T 12237 standards, this valve is the industry benchmark for handling high-concentration nitric acid and other highly oxidizing media where standard stainless steels like 304 or 316L would rapidly fail.
Description
C4 (00Cr14Ni14Si4) is a low-carbon, high-silicon stainless steel specifically formulated for chemical stability in harsh environments:
- Elite Nitric Acid Resistance: Specifically designed to resist corrosion in concentrated nitric acid (HNO3) across a wide range of temperatures.
- Oxidizing Media Protection: The high silicon content forms a dense, protective passive film that excels in highly oxidizing conditions.
- Intergranular Corrosion Resistance: Its ultra-low carbon content ensures excellent stability and resistance to intergranular attack after welding or thermal processing.
Features
- GB Standard Compliance: Fully compliant with GB/T 12237, GB/T 9113, and GB/T 12221, ensuring standardized dimensions and high reliability for domestic Chinese chemical infrastructure.
- Full Bore Design: Maximizes flow efficiency and eliminates the risk of media accumulation, which is critical when handling volatile chemicals.
- Specialized Sealing: Often equipped with high-grade PTFE or specialized metal-to-metal seats to maintain a leak-proof seal in hazardous chemical service.
- Robust Stem Design: Features an anti-blowout stem and anti-static device for enhanced operational safety.
Specifications
| Feature | Specification |
| Design Standard | GB/T 12237 |
| Flange End | GB/T 9113 / JB/T 79 |
| Face-to-Face | GB/T 12221 |
| Body Material | C4 Steel (00Cr14Ni14Si4) |
| Pressure Rating | PN16, PN25, PN40 |
| Temperature Range | -29°C to 180°C (Soft Seat) |
| Testing Standard | GB/T 13927 / JB/T 9092 |
Applications
- Nitric Acid Production: Handling high-concentration ($HNO_3$) and tail gas recovery.
- Fertilizer Manufacturing: Management of concentrated acids used in agricultural chemical production.
- Chemical Refining: Critical flow control for highly oxidizing organic and inorganic acids.
- Nuclear Industry: Spent fuel reprocessing and specialized chemical handling.
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