Large flanged pipe fittings refer to the flanged pipe fittings beyond the size specified in the relevant part. According to the scope used in GB/T9119-2010, the large diameter is DN2000, so the diameter of large flanged pipe fittings is generally greater than DN2000. Most large flanged pipe fittings have no thread or forging due to their diameter. Large flanged pipe fittings is the same as other flanged pipe fittings, it is to connect the pipe or pipe fittings or accessories accessories products, two flanged pipe fittings between the plates, with flange pipe fittings pad, bolted together, complete the connection. Some pipe fittings and devices have flanged pipe fitting plates, which also belong to flanged pipe fitting connection.

Large flanged pipe fittings are the same as other flange pipe fittings, which can be divided into large flanged pipe fittings with flat welding and large flanged pipe fittings with butt welding, although the number of large flanged pipe fittings with flat welding is in the majority. Large flat welding flange pipe fittings of some relatively poor rigidity, so it is generally applied to pressure is not greater than 4 mpa occasions, a lot better than the rigid relatively large flange butt welding pipe fittings, so it will be used in some high pressure or inflammable, explosive or toxic medium, different large flange pipe fittings products among different professions have their own characteristics.

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