DD343H Hard Seal Low Temperature Butterfly Valve Features
1. Extended Bonnet Anti-Freeze Design: The bonnet extension length is determined based on the temperature rating, effectively isolating cold conduction. This keeps the packing area at a higher temperature, preventing packing freeze-up and stem seizure, ensuring flexible and reliable operation.
2. Cryogenic Treatment and Low-Temperature Materials: Critical components designed for ≤ -101°C undergo cryogenic treatment to relieve stress. The low-temperature impact toughness of materials is strictly controlled to ensure dimensional stability at -196°C and prevent brittle fracture.
3. Triple-Offset Hard Seal Structure: Utilizes a triple-offset sealing design that minimizes wear between the seat and disc, providing a sealing effect that tightens as pressure increases. The disc sealing surface is overlaid with hard alloy, enhancing erosion resistance and extending service life.
4. Bidirectional Sealing and Zero Leakage: Excellent sealing performance achieves zero leakage. The seat sealing surface is overlaid with hard alloy, providing superior sealing characteristics.
5. Excellent Control Performance: Possesses good throttling capabilities and can function as a control valve, allowing flow adjustment anywhere within the 0 to 90-degree rotation range.6. Safety Protection Design: Features a blowout-proof stem design for operational safety. A drip plate design effectively prevents condensate from flowing into the insulation layer. Stem packing utilizes low-emission materials to ensure compliance with low-leakage requirements.