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双偏心和三偏心蝶阀哪种好 1
需要看介质和压力
双偏心的蝶阀一般分橡胶软密封(要求温度不能太高、压力不能太高,价格相对偏移)、弹性硬密封(国内技术不成熟,密封面容易损坏,密封性能不好,使用的介质范围广一点)、四氟软密封(压力可以达到600LB,口径做不了太大,价格比橡胶软密封贵,介质范围比橡胶软密封广)
三偏心现在一般都是多层次结构,压力比软密封高、适用工况广,温度适用范围广(低温、高温均可)