45度(du)彎(wan)(wan)頭(tou)(tou)(tou)(tou)在管(guan)路系(xi)統中，彎(wan)(wan)頭(tou)(tou)(tou)(tou)是改變(bian)管(guan)路方(fang)向(xiang)的(de)管(guan)件(jian)。按(an)角(jiao)度(du)分，有(you)45°及(ji)90°180°三種(zhong)最常(chang)用的(de)，另(ling)外根據(ju)工(gong)程(cheng)需要還包(bao)括60°等(deng)(deng)其他非正常(chang)角(jiao)度(du)彎(wan)(wan)頭(tou)(tou)(tou)(tou)。彎(wan)(wan)頭(tou)(tou)(tou)(tou)的(de)材(cai)料有(you)鑄鐵、不(bu)銹鋼、合金(jin)鋼、可鍛鑄鐵、碳鋼、有(you)色金(jin)屬及(ji)塑料等(deng)(deng)。與(yu)管(guan)子連(lian)(lian)接(jie)的(de)方(fang)式有(you):直(zhi)接(jie)焊(han)接(jie)(最常(chang)用的(de)方(fang)式)法蘭連(lian)(lian)接(jie)、熱熔(rong)連(lian)(lian)接(jie)、電熔(rong)連(lian)(lian)接(jie)、螺(luo)紋連(lian)(lian)接(jie)及(ji)承(cheng)插式連(lian)(lian)接(jie)等(deng)(deng)。按(an)照生產工(gong)藝可分為:焊(han)接(jie)彎(wan)(wan)頭(tou)(tou)(tou)(tou)、沖(chong)壓彎(wan)(wan)頭(tou)(tou)(tou)(tou)、推制彎(wan)(wan)頭(tou)(tou)(tou)(tou)、鑄造(zao)彎(wan)(wan)頭(tou)(tou)(tou)(tou)等(deng)(deng)。其他名稱:90度(du)彎(wan)(wan)頭(tou)(tou)(tou)(tou)、直(zhi)角(jiao)彎(wan)(wan)、愛而彎(wan)(wan)等(deng)(deng)。