浮阀是浮阀塔板上的气相分散构件。可以在塔板上浮动，随着气体流量的变化而改变其开启度。浮阀的型式很多，有圆形阀，还有条形的角阀等。中国目前主要采用的是圆形阀。其中最常用的是F1型，国内已有部颁标准(JB1118)。标准规定阀体材料可以选用碳钢、不锈钢或耐酸钢；轻阀厚度为1.5mm，重约25g，重阀厚度为2mm，重约33g。
浮阀是目前国内应用较多的塔盘结构之一，它具有突出的优良性能，其主要特点是：
⑴操作弹性大
由于阀片能自由升降，故能适气量忽大忽小的变化，气缝速度近乎不变，在负荷变动频繁的较宽操作范围内也能保持高的分离效率。
⑵分离效率高
在实际应用中，塔板效率可达60～70%，比泡罩塔盘高10～15，而且在低负荷时效率仍很高。由于效率高，产品质量也相应提高。
⑶处理能力大
因浮阀排列远比泡罩塔紧凑，增加了开孔率，加之气流为水平方向吹入液面层，雾沫夹带量低，可以提高气流量，增大生产能力。生产能力比泡罩塔高出20～40%。
⑷压力降小
气流通过浮阀只有一次收缩、膨胀及转弯，压力降比泡罩塔盘低。在常压塔内每块塔板的压降只有3～5mm汞柱。
此外，它还有结构简单，造价低；使用周期长，不怕脏物料；安装使用方便等优点。嘉兴市久达不锈钢有限公司生产的F1型、V型、有轻阀和重阀多种，也可根据各特殊要求满足用户。
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