安全閥選用的一般規(guī)則。（l）熱水鍋爐一般用不封閉帶扳手微啟式安全閥。（2）蒸汽鍋爐或蒸汽管道一般用不封閉帶扳手全啟式安全閥 

（3）水等液體不可壓縮介質(zhì)一般用封閉微啟式安全閥，或用安全泄放閥。（4）高壓給水一般用封閉全啟式安全閥，如高壓給水加熱器、換熱器等。 （5）氣體等可壓縮性介質(zhì)一般用封閉全啟式安全閥，如儲氣罐、氣體管道等。（6）E級蒸汽鍋爐一般用靜重式安全閥。（7）大口徑，大排量及高壓系統(tǒng)一般用脈沖式安全閥，如減溫減壓裝置、電站鍋爐等，如圖8所示。（8）運(yùn)送液化氣的火車槽車、汽車槽車、貯罐等一般用內(nèi)裝式安全閥。（9）油罐頂部一般用液壓安全閥，需與呼吸閥配合使用。（10）井下排水或天然氣管道一般用先導(dǎo)式安全閥，如圖6所示。（11）液化石油氣站罐泵出口的液相回流管道上一般用安全回流閥。（12）負(fù)壓或操作過程中可能會產(chǎn)生負(fù)壓的系統(tǒng)一般用真空負(fù)壓安全閥。（13）背壓波動較大和有毒易燃的容器或管路系統(tǒng)一般用波紋管安全閥。安全閥---A28X型安全閥，A27W型安全閥，A42Y型安全閥，A47H型安全閥，A41H型安全閥;型號：A21H-16T,A21W-16T,A21X-40T,A27W-10T,A27W-16T,A27X-40T,A27X-100T,A28H-16C,A28H-25C,A28H-40C,A28H-64C，A28X-16T,AK22-16T,H12F-16L,H42F-16L,H12F-16Q.........

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安全閥有彈簧式和桿式兩大類。另外還有沖量式安全閥、先導(dǎo)式安全閥、安全切換閥、安全解壓閥、靜重式安全閥等。彈簧式安全閥主要依靠彈簧的作用力而工作，彈簧式安全閥中又有封閉和不封閉的，一般易燃、易爆或有毒的介質(zhì)應(yīng)選用封閉式，蒸汽或惰性氣體等可以選用不封閉式，在彈簧式安全閥中還有帶扳手和不帶扳手的。杠桿式安全閥主要依靠杠桿重錘的作用力而工作，但由于杠桿式安全閥體積龐大往往限制了選用范圍。溫度較高時(shí)選用帶散熱器的安全閥。

Safety valve selection of a general rule. (l) hot water boiler is normally used is not closed with the wrench micro-kai-type relief valve. (2) steam boiler or steam pipe is normally used is not closed with the wrench in the kai-Relief Valve
(3) water, and liquid is not compressed media in general a closed micro-kai-valve, or the security of the valve. (4) high-pressure water in general the closed the kai-relief valve, such as high-pressure water heaters, heat exchangers, and so on.
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relief valves are spring-loaded and two major categories. In addition, impulse, safety valve, pilot-operated pressure relief valve, safety switch valve, secure the pressure relief valve, the safety valve, and so on. Spring-loaded safety valve mainly rely on Spring, Spring-loaded safety valve in closed and are not closed, and the general flammable and explosive or toxic media should be chosen a closed, steam or inert gas, you can use not closed, the spring-loaded safety valve, with a wrench, and not with the wrench. lever-type relief valve mainly depends on the leverage of the hammer force, but the lever safety valve bulky often limit the available range. A higher temperature with a heat sink of the relief valve.