球墨鑄鐵管(guan)(guan)(guan)配件(jian)漸縮管(guan)(guan)(guan)大(da)小頭承(cheng)插漸縮管(guan)(guan)(guan) 是管(guan)(guan)(guan)道系(xi)統中起連接、控制、變向、分(fen)流、密封、支撐等作用的零部(bu)件(jian)的統稱。鋼制管(guan)(guan)(guan)件(jian)均為承(cheng)壓(ya)管(guan)(guan)(guan)件(jian)。根(gen)據加(jia)工(gong)工(gong)藝不同,分(fen)為四大(da)類,即對焊類管(guan)(guan)(guan)件(jian)(分(fen)有焊縫和(he)(he)無焊縫兩種)、承(cheng)插焊和(he)(he)螺(luo)紋管(guan)(guan)(guan)件(jian)、法蘭管(guan)(guan)(guan)件(jian)。