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把普通蝶阀的关闭位置时的旋转运动密封转化成平面密封，执行机构力全部作用在阀座上，执行机构力通过四连杆进行转换，转换成作用在阀座上的力，这种独特的结构使阀板与阀座迅速脱离、阀座使用寿命长。被广泛应用在电站、冶炼、轻纺、玻璃、水泥等行业中对管道系统的空气或烟、煤气等进行频繁快速开启或截流作用。适用于大口径、大流量、低压差、低泄漏和无泄漏场合。
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