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An Inconel valve is a valve that is made of Inconel alloy. The Inconel is a nickel-based super alloy. The material has excellent oxidation resistance, corrosion resistance, high strength at high temperatures, and resistance to creep. This material strengthens the valve even at elevated temperatures.
A duplex valve is a valve that is made of the duplex steel. Duplex steel is a type of stainless steel material with two phases of the metallurgical structure: the austenite and the ferrite, in almost equal proportions. Duplex material provides better corrosion resistance and higher strength than standard steel.
A Hastelloy valve is a valve that is made of nickel-based alloy known as hastelloy. The two primary elements used to make the hastelloy material are nickel-chromium and nickel-molybdenum. The Hastelloy material has excellent properties relative to other traditional alloys making it one of the preferred alloys used in valve industries.