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英国Forsac公司研制了一种内藏回转衬套的阀门。过去,在维修海底阀门时,必须清除阀门两侧管道内的原油或气体。而新研制的阀门(见图),
Forsac UK has developed a built-in rotary bushing valve. In the past, crude oil or gas in the pipes on both sides of the valve had to be purged when servicing subsea valves. The newly developed valve (see Figure),