碳钢弯头 Carbon Steel Elbow 不锈钢弯头 Stainless Steel Elbow 高压弯头 High-Pressure Elbow NPT=Normal Pressure and Temperature 常温常压 , 标准温度与压力 90°短半径弯头 90°SS Elbow (SR) 90°长半径弯头 90°SS Elbow (LR) 高压厚壁弯头 Thickness Elbow Tee Equal 相等的三通 male plug 插头 female socket 插座 dust cap 防尘盖 等径三通 Straight Tee safety cap 安全罩 异径三通 Reducing Tee 等径四通 Straight Cross 同心异径管 Concentric Reducers