AK21Y外螺纹抗硫安全阀外形尺寸和连接尺寸型号公称通径(DN)dodDoMd1D1LL1≈HA21Y-16C-100C15121520M27×1.5G1/2〞3035816620162025M33×1.5G3/4〞3440876825182531M39×1.5G1〞4452100105A21Y-16P-100P15101525M39×1.5G1〞445210010520102031M39×1.5G1〞445210010525122531M39×1.5G1〞4452100105)