The concave and convex surface with a neck butt welding flange is a concave and convex sealing surface, the gasket is placed in a groove between the two flange sealing surfaces, the convex portion of the flange surface is embedded in the concave portion, the gasket is not displaced, and is not easy to be corroded by the internal medium of the pipeline, which greatly guarantees the tightness of the pipeline system.And with a flange neck, and the pipe can be welded to form a flat weld, to meet the inspection conditions, easy to ensure the quality of welding.
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