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A42Y彈簧全啟封閉式安全閥是一種安全保護(hù)用閥，它的啟閉件受外力作用下處于常閉狀態(tài)，當(dāng)設(shè)備或管道內(nèi)的介質(zhì)壓力升高，超過規(guī)定值時自動開啟，通過向系統(tǒng)外排放介質(zhì)來防止管道或設(shè)備內(nèi)介質(zhì)壓力超過規(guī)定數(shù)值。安全閥屬于自動閥類，主要用于鍋爐、壓力容器和管道上，控制壓力不超過規(guī)定值，對人身安全和設(shè)備運(yùn)行起重要保護(hù)作用。

A42Y-C型適用于工作溫度≤300℃空氣、石油氣、液體等介質(zhì)的設(shè)備和管路上。A42Y-P型及A42Y-R型適用于工作溫度≤200℃有腐蝕性的介質(zhì)的設(shè)備和管路上，作為超壓保護(hù)裝置。連接法蘭標(biāo)準(zhǔn)按JB/T……-94系列1。≥6.4MPa按JB/T……-94系列2。
A42Y-C type are used for the equipment and pipeline of the air, petroleum gas, liquid etc medium what the workingemperature are less than 300℃.A42Y-P type and A42Y-R type are used for the equipment and pipeline of the quality with corrode medium whatthe working temperature are less than 200℃. Take for extra pressure protection devices.Flange connecting dimensions of comply with Standard series one of JB/T……-94, Comply with Standard serieswo of JB/T……-94 when more than 6.4MPa.
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(diào)  節(jié)  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(dǎo)  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	50CrVACoated Teflon	50CrVACoated 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
	Sealing surface of material	Co Depositing stellite