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 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。
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