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A42Y-C型弹簧全启封闭式安全阀适用于工作温度≤300℃空气、石油气、液体等介质的设备和管路上。A42Y-P型弹簧全启封闭式安全阀及A42Y-R型适用于工作温度≤200℃有腐蚀性的介质的设备和管路上，作为超压保护装置。
A42H/Y弹簧全启封闭式安全阀主要材料
| NO. | 零件名称Name of part | A42Y-C/KA42Y-C Materials | A42Y-P/KA42Y-P Materials | A42Y-R Materials | DA42Y-P Materials |
| 1 | 阀 座 Nozzle | 2Cr13/1Cr18Ni9Ti | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti | ZG1Cr18Ni9Ti |
| 2 | 阀 体 Body | WCB | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti | LCB/ZG1Cr18Ni9Ti |
| 3 | 调 节 圈 Adjusting ring | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 4 | Disc holder | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 5 | 阀 瓣 Disc | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 6 | 导 向 套 Guide sleeve | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 7 | 阀 盖 Bonnet | ZG230-450 | ZG230-450 | ZG230-450 | ZG1Cr18Ni9Ti |
| 8 | 弹 簧 Spring | 50CrVA | 50CrVA Coated Teflon | 50CrVA Coated Teflon | 50CrVA |
| 9 | 阀 杆 Stem | 2Cr13 | 1Cr18Ni9Ti/1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti/1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 10 | Adjusting bolt | 45 | 2Cr13 | 2Cr13 | 2Cr13 |
| 11 | Cap | ZG200-400 | ZG200-400 | ZG200-400 | ZG230-450 |
