安(an)全(quan)阀(fa)是一(yi)种安(an)全(quan)保护(hu)用(yong)(yong)(yong)(yong)阀(fa)，它(ta)的(de)启闭件受外(wai)力(li)(li)作用(yong)(yong)(yong)(yong)下(xia)处于(yu)常闭状态，当(dang)设备(bei)或管(guan)道内(nei)(nei)的(de)介质(zhi)压(ya)力(li)(li)升高(gao)，超过(guo)规定值(zhi)时自(zi)动(dong)(dong)开启，通过(guo)向系统外(wai)排(pai)放介质(zhi)来防止(zhi)管(guan)道或设备(bei)内(nei)(nei)介质(zhi)压(ya)力(li)(li)超过(guo)规定数值(zhi)。安(an)全(quan)阀(fa)属(shu)于(yu)自(zi)动(dong)(dong)阀(fa)类，主要(yao)(yao)用(yong)(yong)(yong)(yong)于(yu)锅(guo)炉、压(ya)力(li)(li)容(rong)器和(he)管(guan)道上，控制压(ya)力(li)(li)不超过(guo)规定值(zhi)，对人身安(an)全(quan)和(he)设备(bei)运行起重(zhong)要(yao)(yao)保护(hu)作用(yong)(yong)(yong)(yong)。
