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A28H帶手柄彈簧全啟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(shí)自動(dòng)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(dòng)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(duì)人身安全和設(shè)備運(yùn)行起重要保護(hù)作用。
 

A28H-10 A28Y-10P A28Y-10R8 A28Y-25R8 A28Y-40R8 A28H-16 A28Y-16P A28Y-16R8 A28Y-25R8 A28Y-40R8
A28H型適用于工作溫度≤200℃的空氣、蒸汽、水、氮?dú)浠旌蠚獾冉橘|(zhì)的設(shè)備或管路上，A28Y-P/10R8適用于工作溫度≤200℃有腐蝕性介質(zhì)的設(shè)備或管路上，作為超壓保護(hù)裝置。
A28H type are used for the equipment and pipeline of  the air, N2, H2 mixed gas vapour etc.medium what the working temp-erature are less than 200 . A28Y-P/10R8 type are used for the equipment  and pipeline of the quality with corrode medium what the working temperature are less than 200 . Take for extra pressure protedion devices.
主要零部件材料Explanation of materials for main parts
NO.	Name of part	A28H Materials	A28Y-P Materials	A28Y-R8       Materials
1	Body	HT200	ZG1Cr18Ni9Ti	CF8M
2	Nozzle	35	ZG1Cr18Ni9Ti	CF8M
3	Adjusting ring	2Cr13	1Cr18Ni9Ti	316
4	Disc	2Cr13	1Cr18Ni9Ti	316
5	Spring	50CrVA	50CrVACoated Teflon	50CrVACoated Teflon
6	Stem	2Cr13	2Cr13	316
7	Adjusting bolt	45	2Cr13	316
8	Cap	ZG200-400	ZG200-400	CF8M
	Sealing surface of material	D507 Depositing D507	Co Depositing stellite
10	Adjusting nut	Q235-A	2Cr13	1Cr18Ni12Mo2Ti
	Sealing surface of material	"Y" CoDepositing stellite, "H" D507 Depositing D507, "W"body