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Duplex butterfly valves have good corrosion resistance and high strength performance because of their material character. So-called “duplex stainless steel” is the ferrite and the austenite probably respectively occupies in its melting organization one half. Even a small amount not less than 30% as well. Because the duplex stainless steel has the ferrite and the austenite elements, therefore it has merits that high intensity and bears the chloride stress corrosion performance which the ferritic stainless steel has, and fine tough and welding performance which the austenite stainless steel has.
Duplex steel valve’s anti-chloride pitch corrosion, the slit corrosion and the stress corrosion performance are extremely superior, and the mechanical strength is high, bears weary and the attrition corrosion property is good, these merits which stainless steel all are unable to compare.
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Hastelloy B series valves corrosion resistance feature: It has the good corrosion resistance performance in the reducible sour medium and so on the hydrochloric acid, sulfuric acid, phosphoric acid.
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Inconel is a “super alloy” material that is sometimes used for exhaust valves because of its superior high-temperature strength. Inconel the nickel content in the alloy is much higher than that of stainless steel, the corrosion resistance of alkali sulfide is better that of stainless steel, and the corrosion resistance of high temperature is better.
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Monel butterfly valves corrosion resistance feature: It has an excellent anti-corrosion performance in the reducing acid medium, and resistant to any density of hydrofluoric acid solution corrosion.
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Nickel Aluminium-bronze valves are suitable for many seawater applications, especially in low-pressure applications. The most common valve in NAB is the large butterfly valves which offer come with a NAB body and monel trim, which far cheaper substitute for full Monel valves.
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Nickel butterfly valves to ensure that pipeline valves long-term safe, reliable, stable operation even in the extreme harsh corrosive medium.
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Stainless steel butterfly valves bringing light weight to applications with low cost, jst High performance butterfly valves from 2″ to 100″.
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Super austenitic stainless steel corrosion resistance is higher than the duplex grades, because its alloy content is higher.
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Used in the chemical industry for its resistance to corrosion (in particular sulfuric acid) and temperature, Tantalum is virtually impervious to the chemical attack of acids for temperatures below 150°C.
Grade: Ta, Ta pur ( 99.85 % min), Ta-2, 5%W (KBI 6); Ta-10%W (KBI 10)
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JST titanium butterfly valves can be available in casting or forging type. Recently JST supplied lots forging titanium butterfly valves for mining and desalination.Titanium Butterfly valves come typically in wafer or lug style. However it is no uncommon to see a flanged butterfly valves in high performance applications.JST titanium butterfly valves normally use common titanium Grade 2, Gr.3, Gr.5, Gr.7, Gr.12.
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Zirconium is a precious metal and the price is relatively expensive. But as a result of its unique physics and chemistry corrosion resistance performance, so that it cannot be substituted in domain applications and so on the nuclear industry, aviation, civil aviation and chemical industrial. Widely used in pipeline safety technology to ensure long-term, stable and reliable operation.
