Duplex Stainless Steel Butterfly Valves Description
Duplex stainless steel butterfly valve is a butterfly valve made of duplex stainless steel (ferrite and austenite coexist in a ratio of ≈1:1) as the base material. It achieves corrosion resistance, high strength and bidirectional sealing functions through special structural design.
Advantages
Adaptability to extreme working conditions
Resistant to high concentration chloride ion media (such as seawater, acidic oil and gas) and corrosive environments containing hydrogen sulfide;
Maintains sealing stability under alternating pressure (±1 MPa/s), avoiding sudden leakage caused by stress corrosion of traditional butterfly valves.
Long life and low maintenance
The life of the sealing pair is ≥10 years (usually 3-5 years for conventional butterfly valves), and the annual wear rate is <0.005mm;
Adopting a top-mounted structure, the valve seat can be repaired without disassembling the pipeline, and the maintenance efficiency is increased by 60%.
Efficient fluid control
The large-size butterfly plate (DN≥500) adopts a quilted structure, and the flow resistance coefficient is reduced by 40%, which is suitable for large flow medium control;
Supports two-way installation, is not restricted by the flow direction of the medium, and simplifies the complexity of pipeline design.
Duplex Stainless Steel Butterfly Valves specification
Design standard: BS5155,API609, EN593
Test standard: DIN3230 Part3, API598, EN12266-1
Face to face standard: DIN3202K1, API609, EN558-1, ISO5752.
Medium: water, sewage, oil, food, gas and so on.
Flange connection: DIN2501 PN10/16, BS4504 PN10/16, ASME B16.1 125LB & 150LB,
JISB2220 10K and so on.
Working pressure: 10 bar/16 bar.
Test pressure:
Shell: 15bar/24 bar
Seal: 11bar/17.6 bar
Duplex Stainless Steel Butterfly Valves
Application and industry value of duplex stainless steel butterfly valve
| Industry | Application | Solving the problem |
|---|---|---|
| Chemical/Petrochemical | Feed Control of Reactor Containing Chloride Ion Media | Preventing valve failure due to chloride stress corrosion |
| Electricity | Seawater cooling system, flue gas desulfurization device | Resistant to seawater erosion and sulfide corrosion |
| Marine Engineering | Subsea pipeline cut-off and ballast water system | Adapt to high pressure, low temperature and salt spray environment |
| Metallurgy | High temperature flue gas waste heat recovery system | Solve the problems of high temperature oxidation and granular media wear |
| Environmental friendly | Acidic Medium Conditioning in Wastewater Treatment | Reduce the risk of material corrosion in strong acid (pH ≤ 1) environments |
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