spool piece meaning in English

卷筒
排气套管

Articulated spool piece
铰接联接短管段
Blind flanged spool piece
盲法兰短管
Check valve and butterfly valve combinations are very popular ; normally a short spool piece is required between the valves
止回阀和蝶阀组装是很常见的，通常需要在阀门之间增加一段短管。
The welding head will be relatively fixed , while the piping spool piece revolving at a specific rate , and the high efficient and low cost co2 shielded welding or saw process is adopted , so it has the features of easy - operation , reliable - performance and wide - application field
本焊机采用管子转动、焊接机头相对固定的方式实现自动焊接，焊接工艺采用高效率、低成本的co2气体保护焊或埋弧自动焊，操作简单，性能可靠，适用范围广。