三偏心零泄露蝶阀
三偏心蝶阀，被广泛用于介质温度≤425℃的冶金 、电力、石油化工、以及给排水和市政建设等工业管道上，作调节流量和载断流体使用。材质分为：铸铁、铸钢、不锈钢。
要耐高温、必须使用硬密封、但泄漏量大；要零泄漏、必须使用软密封、却不耐高温。为克服双偏心蝶阀这一矛盾、又对蝶阀进行了第三次偏心。而所谓第三次偏心，就是密封副的形状不是正锥，而是斜锥。三偏心蝶阀
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