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A42Y-C型彈簧全啟封閉式安全閥適用于工作溫度≤300℃空氣、石油氣、液體等介質的設備和管路上。A42Y-P型彈簧全啟封閉式安全閥及A42Y-R型適用于工作溫度≤200℃有腐蝕性的介質的設備和管路上，作為超壓保護裝置。
A42H/Y彈簧全啟封閉式安全閥主要材料
| NO. | 零件名稱Name of part | A42Y-C/KA42Y-C Materials | A42Y-P/KA42Y-P Materials | A42Y-R Materials | DA42Y-P Materials |
| 1 | 閥 座 Nozzle | 2Cr13/1Cr18Ni9Ti | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti | ZG1Cr18Ni9Ti |
| 2 | 閥 體 Body | WCB | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti | LCB/ZG1Cr18Ni9Ti |
| 3 | 調 節 圈 Adjusting ring | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 4 | Disc holder | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 5 | 閥 瓣 Disc | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 6 | 導 向 套 Guide sleeve | 2Cr13 /1Cr18Ni9Ti | 1Cr18Ni9Ti | 1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 7 | 閥 蓋 Bonnet | ZG230-450 | ZG230-450 | ZG230-450 | ZG1Cr18Ni9Ti |
| 8 | 彈 簧 Spring | 50CrVA | 50CrVA Coated Teflon | 50CrVA Coated Teflon | 50CrVA |
| 9 | 閥 桿 Stem | 2Cr13 | 1Cr18Ni9Ti/1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti/1Cr18Ni12Mo2Ti | 1Cr18Ni9Ti |
| 10 | Adjusting bolt | 45 | 2Cr13 | 2Cr13 | 2Cr13 |
| 11 | Cap | ZG200-400 | ZG200-400 | ZG200-400 | ZG230-450 |
