摘要
目前国内天然气长输管道敷设面越来越大,安全措施很关键。执行机构使阀门在紧急情况下自动关断,所以,执行机构的选择尤为重要。
At present,internal natural gas pipeline lay cover more and more place.The importance of security seemes specially.The valve closed automatism by it's enforce equipment in circumstances.It's one of safety method.so,The se- lect of enforce equipment is very important.
