Aeration & vent valve (BE891-BE991)
       for reliable aeration and venting of pipeline systems
       optional aerator (B 895) in combination with spring
       reliable and low-maintenance
       ball / float made of PP
       呼吸閥BE891、991
       口徑：DN10至DN80
       材質(zhì)：PP、PVDF、PVC-U
       密封材質(zhì)：FPM
       彈簧材質(zhì)：鋼制彈簧，ECTFE(Halar)涂層
       排氣閥和呼吸閥是幫助容器排氣用和通氣作用。

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