Welding and butt welding flange means and pipe connection, and when only one side welded flange welded pipe and flange welding without welding connections inside the mouth, butt welding flange installation requires double flange surface welding. So welded flange generally used for low and medium pressure pipe, welded flange is used in stainless steel flange connection supplier of high-pressure pipelines, welded flange is generally at least PN2.5MPa, using the butt to reduce stress concentration, in general, mostly with welded flange neck flange also called nipple flange. So welded flange mounting costs, labor costs and auxiliary fees are high stainless steel flange parameters, because more than one process. Ministry of Machinery Standard: JB81-59 ~ JB86-59, JB/T79-94 ~ JB/T86-94, JB/T74-1994 Pressure Vessel Code: JB1157-82 ~ JB1160-82, JB4700-2000 ~ JB4707-2000, the pump and valves and pipes in the adjoining stainless steel flange dealers, these tools are set up local furnishings and equipment, but also made the corresponding flange shape, also known as the adjoining flange. All in two planes at the same time blocking the adjacent surrounding bolt manipulation adjoining parts, as usual are called "high pressure flange", such as the adjoining ventilation ducts, this type of parts can be called "high pressure flange parts." But this is only one set of equipment furnishings adjoining local stainless steel flange, such as flanges and pump adjoining, it is not good to pump called "flange parts." Doo Jin small such as valves, etc., can be called "high flange parts." [] Stainless Steel Flanges, Stainless Steel Flanges suppliers, pipeline welcome you courtesy of Cathay Cathay Hebei. Welcome to consult Hebei Cathay Pacific Pipeline Equipment Co. (www.hbgtgd.com), be sure to specify when contact is through the "Business Alliance Member" see, thank you! Contact: Liu