... 缩口阀门（reduced-bore valve） 双向阀门（bi-directional valve） 双座双向阀门（twin-seat, both seats bi-directional, valve） ...
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The construction of concentric bi-directional valve overcomes the disadvantage of easy to connect between two parallel check valves.
同心双向阀结构克服了传统的单向阀并联结构两阀间易连通的缺点。
The Bi-Directional Knife Gate Valve provides bubble tight shutoff in both directions up to full rating of the valve.
这种双向刀闸阀在阀门压力等级下，任何方向均可实现气泡级密封关闭功能。
The triple Offset Butterfly Valve provides a bi-directional bubble tight shut-off.
三偏心蝶阀具有双向无气泡紧密关闭性能。
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