Flange cover is also called blind flange, blind plate. It is a flange without a hole in the middle, which is used to seal the pipe plug. The function is the same as the welding head and the threaded pipe cap, except that the blind flange and the threaded pipe cap can be removed at any time, while the welded head cannot.The flange cover is also called the flange protective cover; it prevents the flange surface from being damaged during transportation, and the key function is to protect the flange sealing surface. Flanges are divided into flat welding flanges, butt welding flanges, neck butt welding flanges, neck flat welding flanges, and blind flanges; plastic flange covers are divided into national standard flange covers and American standard flange covers. Wide flange cover; like butt welding flange, you may wish to use four-hole flange cover, which will be divided into American standard and national standard; if the model is large, use wide flange cover, also called universal flange cover. Its function is the inner hole of the flange, which also protects the sealing surface of the flange; plastic flange strips, also called flange racks, can also be used; like blind flanges, four-hole flange covers must be used, wide-side method Neither the flange cover nor the flange strip can be used, because there is no inner hole in the middle of the blind flange, and the wide flange cover and flange strip are placed in the inner hole, so only four-hole flange covers can be used.Flange covers are divided into national standard and American standard; national standard has PN16, PN10, PN25, PN40 (PN stands for kilogram pressure); American standard has 150LB, 300LB, 600LB, 900LB, 1500LB (LB stands for pound class).
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Post time: 21-09-21