SKU:弹簧微启式外螺纹安全阀(A21H) Description: 系列 Series A21F-16C A21H-16C A21H-40 A21H-64 A21Y-100 A21H-160 A21W-16P A21W-40P A21F-40P A21W-64P A21W-100P A21W-160P KA21Y-16C KA21Y-16P A21Y-16R A21Y-40R A21Y-64R A21Y-100R A21Y-160R A21F、A21H-C型适用于工作温度≤200℃的空气、氨、石油气……等介质的设备或管路上。A21W-P、R型适用于温度≤200℃有腐蚀性的气体或液体的设备或管路上，作为超压保护装置。KA21Y型适用于温度≤100℃的液化石油气等。 A21F, A21H-C type are used for the equipment and pipeline of the air, ammonia, petroleum gas, etc. medium what the wor-king temperature are less than 200 . A21W-P, R type are used for the equipment and pipeline of the quality with corr ode gas and liquid medium shat the wor-king temperature are less than 200 . Take for extrapressure protection devices. KA21Y type are used for liquefied petroleum gas what the working temperature are less than 100 主要零部件材料 Explanation of materials for main parts NO. Name of part A21H-C/A21F KA21Y-C Materials A21W-P/A21F-P KA21Y-P Materials A21Y-R Materials 1 Union 20 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 2 Union nut 35 2Cr13 1Cr18Ni9Ti 3 Nozzle 35 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 4 Body 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 5 Disc 2Cr13/2Cr13+PTFE 1Cr18Ni9Ti/1Cr18nI9Ti+PTFE 1Cr18Ni12Mo2Ti 6 Spring washer 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 7 Spring 50CrVA 50CrVA Coated Teflon 50CrVA Coated Teflon 8 Locking nut Q235-A 2Cr13 1Cr18Ni9Ti 9 Spring guide 2Cr13 1Cr18Ni9Ti 1Cr18Ni12Mo2Ti 10 Adjusting nut Q235-A 2Cr13 1Cr18Ni12Mo2Ti 　 Sealing surface of material "Y" Co Depositing stellite, "H" D507 Depositing D507, "W" body