安全阀safety valve主要是起保护作用，防止管道系统超压，保证人身安全。一般用于受压设备和管道上，

当压力超过规定数值时，自动泄压。It is basically to have protective effect, prevent conduit system overpressure, assure person safety. It is generally used in pressurized equipment and pipelines to relieve pressure automatically when the pressure exceeds the specified value.