Views: 0 Author: J-VALVES Publish Time: 2025-03-21 Origin: Site
Understanding Butterfly Valve Seals
Soft seals in butterfly valves are typically made from elastomeric materials such as EPDM (Ethylene Propylene Diene Monomer), NBR (Nitrile Butadiene Rubber), or PTFE (Polytetrafluoroethylene). These materials provide excellent sealing properties and are often used in applications where tight sealing is required.
Hard seals in butterfly valves are typically made from metallic materials such as stainless steel, brass, or other alloys. These materials provide superior durability and resistance to wear and tear, making them suitable for high-pressure and high-temperature applications.
Comparative Analysis: Soft Seals vs. Hard Seals
| Feature | Soft Seals | Hard Seals |
| Sealing Capability | Excellent, providing tight sealing even at low pressures | Good, but may not provide as tight a seal as soft seals |
| Leakage Rate | Very low leakage rate, suitable for applications requiring zero leakage | Slightly higher leakage rate, but still suitable for most industrial applications |
Durability and Wear Resistance
| Feature | Soft Seals | Hard Seals |
| Wear Resistance | Lower wear resistance compared to hard seals | Higher wear resistance, suitable for high-pressure and high-temperature applications |
| Service Life | Generally shorter service life due to material degradation | Longer service life due to superior durability |
Temperature and Pressure Range
| Feature | Soft Seals | Hard Seals |
| Temperature Range | Typically limited to lower temperatures (e.g., -20°C to 150°C) | Suitable for higher temperatures (e.g., up to 650°C) |
| Pressure Range | Suitable for lower pressure applications (e.g., up to 16 bar) | Suitable for higher pressure applications (e.g., up to 40 bar or more) |
