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
       呼吸阀BE891、991
       口径：DN10至DN80
       材质：PP、PVDF、PVC-U
       密封材质：FPM
       弹簧材质：钢制弹簧，ECTFE(Halar)涂层
       排气阀和呼吸阀是帮助容器排气用和通气作用。

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