Features 1, direct welding with the pipe assembly, the user pipe without flange, cost savings; 2, the use of high quality alloy steel welding, with small size. Light weight, good surface quality, high cleanliness, small flow resistance; 3, the use of multi-level design principles, the use of soft and hard metal seal laminated composition. With high temperature, corrosion-resistant, long life and other characteristics. Product Usage Welded hard seal butterfly valve is widely used in power plant heating systems and value-cracking of the main fan duct systems, steel, metallurgy, chemical and other industrial pipe to cut off or regulate the flow effect Keywords for the product: