当压力改变时,阀帽容易上下移动.Bonnet tendency to move up or down as pressure changes.阀帽: 不需要将阀门从管路中拆除,就可以进入维护铰链和阀瓣.Cap: permits access to hinge and disc without removing valve from line.止回阀标签通常安置在阀帽的边缘上.Check valve tags are typically ...
"Surely there's something we can do?" interjected Palin.“我们一定可以做点儿什么吧？”佩林突然插话道。" What's all this? " the district chief interjected.区长道: “ 干什么?After a moment's break , Mel interjected.在短暂的沉默之后, 梅尔插了进来....