Product Features
1. Duplex steel is pressure-resistant and corrosion-resistant
Duplex stainless steel (2205/2507) has a yield strength of ≥450MPa, pitting resistance PREN ≥32, and chlorine resistance is twice that of 316L, suitable for H₂S/CO₂ media; composite seal (fluororubber + metal hard seal) has a temperature resistance of -20℃~180℃, a two-way pressure bearing of ≤6.4MPa, and a leakage rate of ≤0.001% VOL.
2. Double-flap linkage improves efficiency and energy saving
Double-flap symmetrically balances pressure, opening and closing torque is reduced by 40%, and actuator cost is reduced by 20%; pneumatic actuator completes 90° opening and closing in 10-15 seconds, and water hammer suppression rate is >90%, which is suitable for emergency shutoff.
3. Compact maintenance-free design
60% shorter and 50% lighter than gate valves, suitable for confined spaces; self-lubricating bearings (PA66 + molybdenum disulfide) are lubrication-free, maintenance cycle ≥5 years, reducing downtime costs.
4. Intelligent compatibility and high reliability
Standard ISO 5211 interface, compatible with electric actuators with HART protocol, supports 4-20mA feedback and fault diagnosis; each unit is tested with 1.5 times water pressure (maintaining pressure for 30 minutes) + helium mass spectrometer leak detection (leakage rate <5×10⁻⁹Pa・m³/s), with a third-party report.
Duplex steel butterfly valves have significant advantages over ordinary butterfly valves:
Material and corrosion resistance: Duplex stainless steel (2205/2507) has a yield strength of ≥450MPa (304 is only 205MPa), pitting resistance coefficient PREN≥32, and chlorine resistance is twice that of 316L, suitable for strong corrosive media such as H₂S/CO₂; ordinary valves are mostly 304/cast iron, with weak corrosion resistance and easy to rust under harsh working conditions.
Structure and opening and closing performance: Double-flap linkage reduces torque by 40%, pneumatic opening and closing is completed in 10-15 seconds, composite seals have a two-way pressure of ≤6.4MPa, and a leakage rate of ≤0.001% VOL; ordinary valves have large single-flap torque, pressure of ≤1.6MPa, slow opening and closing (15-30 seconds), and are prone to leakage under high pressure.
Working conditions and life: Duplex steel valves can withstand pressures of 2.5-10.0MPa and are suitable for high-pressure scenarios such as petrochemicals and seawater desalination. They have a lifespan of more than 150,000 times and a maintenance cycle of ≥5 years. Ordinary valves are mostly used in low-pressure scenarios, with a lifespan of only 50,000-80,000 times and are prone to failure in corrosive environments.
Maintenance and installation: Duplex steel valves are lubrication-free and modularly designed, with maintenance costs reduced by 60%, a 50% smaller size, and flexible installation; ordinary valves require regular maintenance, are large in size, and have limited space.
Intelligence: Duplex steel valves are compatible with intelligent actuators, have a response time of <3 seconds, and support remote control; ordinary valves have few intelligent configurations and weak system integration capabilities.
FAQ
1. What is the pressure limit of the duplex steel butterfly valve? Can it be used for high-pressure steam pipelines?
The conventional pressure range of duplex steel butterfly valves is 2.5-10.0MPa (PN25-PN100), of which 2507 duplex steel can withstand a maximum pressure of 10.0MPa. For high-pressure steam pipelines (such as working conditions with temperature ≤425℃ and pressure ≤6.4MPa), metal hard seals + high-temperature resistant coatings (such as Stellite alloy cladding) can be selected, and pass the 1.5 times nominal pressure water pressure test (maintaining pressure for 30 minutes without leakage), meeting the ASME B16.34 standard requirements.
2. How to verify the corrosion resistance of duplex steel butterfly valves? Is it suitable for seawater environment?
Duplex stainless steel (2205/2507) has a pitting resistance coefficient (PREN) ≥ 32, and a chloride ion corrosion resistance of more than 20,000ppm. It has passed the H₂S stress corrosion test of the NACE MR0175 standard. In seawater environment (chloride ion concentration ≈ 20,000ppm), its annual corrosion rate is <0.01mm, which is much lower than the 0.05mm/year of 316L stainless steel. It is suitable for offshore platforms, desalination pipelines and other scenarios, and provides third-party corrosion detection reports.
3. Will the double-flap linkage structure increase the risk of valve failure? What is the maintenance cost?
The double flaps are rigidly connected through the central axis, and the structural redundancy design improves reliability. After 100,000 opening and closing tests, there is no shaft deformation; self-lubricating bearings (PA66 + molybdenum disulfide) are used, and the lubrication-free maintenance cycle is ≥5 years. The modular valve disc supports online replacement, and the single maintenance time only takes 30 minutes (traditional valves take 2 hours), reducing the maintenance cost by more than 60%.
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