等径直通equal coupling
异径直通reducing coupling
内牙直通 female coupling
外牙直通 straight tube with outside
外牙弯头 male elbow
内牙弯头 female elbow
等径三通 equal tee, straight tee
异径三通 reducing tee
内牙三通female tee
外牙三通 male tee

等径四通　Straight Cross
管帽 cap
碳钢弯头 Carbon Steel Elbow
不锈钢弯头 Stainless Steel Elbow
高压弯头 High-Pressure Elbow
同心异径管 Concentric Reducers
偏心异径管 Eccentric Reducers
高压异径管 High-pressure Reducers
不锈钢等径三通 Stainless Straight Tee
碳钢等径三通 Carbon Straight Tee
不锈钢等径四通 Stainless Straight Cross
高压三通 High-pressure Tee
锻制三通 Forged Tee
法兰flange
长径和短径弯头 long and short radius elbows
同心和偏心异径接头 concentric and eccentric reducers
等径和异径三通 straight and reducing outlet tees
大小头 concentric reducer
厚壁弯头 Thickness Elbow
U型管　Return Bend　
盲法兰　Blank Flange
弯管　Bends
翻边　stub ends
异径接头　reducers
公称通径 nominal diameter
外径 outside diameter
中心距至端面的距离 center to end
理论重量 approx weight
材质 Material　
双丝头 Nipple
内外螺纹活接头 Union
螺桩 stud
盲板 Blind Flange
拆除 dismantle
结头（管线的）：tie-in
插盲板：slip spade
盲板：blank
接头：fitting