这些变化可能采取行动的一个膜片或活塞这反过来又激活阀门，阀门这种类型的例子，发现常见的有安全阀门安装在系统或热水锅炉。
These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
当其中之一的阀门被激活，如果恰好迸发前工人操作不慎，那么防喷器就不会阻止油气流，当其失去与平台之间的连接时也不会切断其本应切断的油气流，即便稍后便启动了一个远程操作装置。
Nor did it shut off the flow when its connections to the rig were lost, as it should have. Nor when a remotely operated vehicle activated it later.
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