bidirectional air valve 双向气阀
a bidirectional air valve 双向气阀
bidirectional valve
双向阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The butterfly valve has the advantages of small volume, low cost, little abrasion, long service life, good sealing effect, high reliability, convenient maintenance and bidirectional sealing.
这种蝶阀的体积小、成本低、磨损少、寿命长、密封性好、可靠性高、维修方便，并具有双向密封。
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