safety flap

• 安全瓣,安全节气门

safety flap的用法和样例：

例句

1. For added safety there is a built-in thermal fuse and a flow restrictor which prevents an uncontrolled drop in pressure in the event that one of the supply lines becomes damaged.
   为增加安全性，建有热保险和流体节气门，防止某供应线路损坏时压力自由的下降。