| A21F、A21H-C型彈簧微啟式外螺紋安全閥適用于工作溫度≤200℃的空氣、氨、石油氣……等介質的設備或管路上。A21W-P、R型彈簧微啟式外螺紋安全閥適用于溫度≤200℃有腐蝕性的氣體或液體的設備或管路上，作為超壓保護裝置。KA21Y型彈簧微啟式外螺紋安全閥適用于溫度≤100℃的液化石油氣等。
彈簧微啟式外螺紋安全閥主要零部件材料 | NO. | 零件名稱 | A21H-C/A21F材料 | A21W-P/A21F-P材料 | A21Y-R材料 | | 1 | 管接頭 | 20 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | | 2 | 管接頭螺母 | 35 | 2Cr13 | 1Cr18Ni9Ti | | 3 | 閥座 | 35 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | | 4 | 閥體 | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | | 5 | 閥瓣 | 2Cr13/2Cr13+PTFE | 1Cr18Ni9Ti/1Cr18Ni9Ti+PTFE | 1Cr18Ni12Mo2Ti | | 6 | 彈簧座 | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | | 7 | 彈簧 | 50CrVA | 50CrVA包覆氟塑料 | 50CrVA包覆氟塑料 | | 8 | 鎖緊螺母 | Q235-A | ZG230-450 | 1Cr18Ni9Ti | | 9 | 彈簧導向墊 | 2Cr13 | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | | 10 | 調節螺母 | Q235-A | 2Cr13 | 1Cr18Ni12Mo2Ti | | | 密封面材料 | "Y"型堆焊Co基硬質合金,"H"型堆焊D507,"W"型為閥門本體 | ■彈簧微啟式外螺紋安全閥外形尺寸和連接尺寸 | 型號 | 公稱通徑 | do | d | Do | M | d1 | D1 | L | L1 | ≈H | | KA21-16C
A21H-16C
A21H-40
A21W-16P
A21W-40P
KA21-16P | 15 | 12 | 15 | 20 | M27×1.5 | G1/2" | 30 | 35 | 76 | 66 | | 20 | 16 | 20 | 25 | M33×1.5 | G3/4" | 35 | 40 | 87 | 68 | | 25 | 18 | 25 | 31 | M39×1.5 | G1" | 40 | 50 | 100 | 105 | | A21Y-64
A21Y-64P
A21Y-100
A21Y-100P | 15 | 10 | 15 | 25 | M39×1.5 | G1" | 44 | 50 | 100 | 66 | | 20 | 10 | 20 | 31 | M39×1.5 | G1" | 44 | 50 | 100 | 68 | | 25 | 12 | 25 | 31 | M39×1.5 | G1" | 44 | 50 | 100 | 105 | | A21W-160/160P | 15 | 8 | 20 | / | M24×2 | G1" | 44 | 50 | 100 | 261 | | 20 | 8 | 25 | / | M33×2 | G1" | 44 | 50 | 100 | 261 | | 25 | 8 | 28 | / | M36×2 | G1" | 44 | 50 | 100 | 285 | |
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