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Long weld neck flange
Long weld neck flange is actually an expansion form of butt welding flange with neck. Long weld neck is slightly straight and simple, and the height of the neck is 229mm (≤ DN100) or 305mm (> DN100). The flange neck is not processed with groove, and the processing of groove can be determined through consultation with the user according to the relevant requirements of hg20615-2009. Long and high neck flange is often used in cl ass series pipe flange. When the pipe flange with nominal size less than or equal to DN50 is matched with the cylinder, the long and high neck flange can also avoid the d
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