904L National Standard Flange Butterfly Valve is engineered using an advanced three-dimensional eccentric, multi-level metal seal structure. By integrating and optimizing international valve technologies, this system ensures elite performance in the most corrosive and demanding industrial environments.
Key Applications and Features
- Because of its high-grade 904L stainless steel construction, this valve is ideal for specialized industrial needs. Specifically, it is highly effective for:
- Corrosive Chemical Processing: Designed for environments where standard steel fails, particularly in sulfuric acid and chloride-rich settings.
- Metallurgy and Electric Power: Reliably handles medium temperatures up to 550°C.
- Petrochemical Industry: Provides a high-strength, leak-proof seal for volatile fluid management.
- Water Treatment: Acts as a premium device for regulating fluid flow and providing a secure cutoff in harsh drainage systems.
Technical Advantages
Furthermore, the triple eccentric structure ensures that the valve operates with virtually zero friction between the seat and the plate. Consequently, this leads to a significantly longer service life and reduced operational torque. Additionally, the multi-level metal seal provides excellent airtightness even under extreme pressure and thermal stress.
Material Benefits: 904L Stainless Steel
| Property | Benefit |
| High Nickel/Molybdenum | Exceptional resistance to pitting and crevice corrosion. |
| Copper Content | Greatly improves resistance to strong reducing acids. |
| Temperature Range | Maintains structural integrity up to 550°C. |
| Sealing Design | Triple eccentric for low-friction, long-term durability. |
Technical Features of the 904L Flange Butterfly Valve
1. Superior Dual-Layer Sealing
The butterfly plate seal is constructed using a specialized layering of hard and soft metal components. Because it integrates a metal seal with a flexible seal, the valve offers the dual advantage of high performance in both low and high-temperature scenarios. Consequently, this ensures excellent sealing integrity across a wide range of thermal conditions.
2. Triple Eccentric Precision
By utilizing a three-dimensional eccentric structure, the valve seat and butterfly plate operate with virtually zero friction. Furthermore, this design incorporates a “torque-sealed” function; essentially, the more the valve is closed, the tighter and more secure the seal becomes.
3. High-Performance Alloy Surface
The sealing surface is reinforced with welded stainless steel and cobalt-based alloys. As a result, the surface provides exceptional wear resistance and a significantly longer service life. This is particularly beneficial when handling the corrosive mediums often paired with 904L steel.
4. Advanced HPV Geometry
The structure is uniquely designed to ensure that operation is both nimble and effortless. While standard double eccentric valves only reduce friction for a small portion of the travel, our HPV model adds a unique eccentric angle $\beta$.
5. Frictionless Operation and Reliability
The specific slope of the cone ensures that the seal and the seat avoid contact until the final moment of closure. Therefore, friction is eliminated during the opening and closing cycles, which drastically increases the lifespan of the internal components. Additionally, users can adjust the seal overpressure through torque changes to ensure a reliable, “never-leak” performance.
Technical Advantages of the HPV Design
| Feature | Standard Valve | HPV 904L Series |
| Friction | High during travel | Zero until final closure |
| Corrosion Resistance | Moderate | Extreme (904L + Cobalt Alloy) |
| Sealing Force | Fixed | Torque-Adjustable |
| Temperature | Standard | High-Temp (550°C) |