三偏心双向压硬密封蝶阀 - 浙江国技流体控制有限公司
三偏心双向压硬密封蝶阀

三偏心双向压硬密封蝶阀

三偏心金属硬密封蝶阀
蝶阀已广泛应用于石油、化工、冶金、水电等诸多领域,作为实现管道系统的开关和流量控制的一部分。在已知的蝶阀技术中,密封形式有密封结构,密封材料有橡胶、聚四氟乙烯等。由于结构特性的限制,不适合高温、高压、耐腐蚀、耐磨等行业。有一种比较先进的蝶阀是三偏心金属硬密封蝶阀,阀体和阀座均为连接组件,阀座密封面层堆焊焊温,耐腐蚀合金材料。多层软叠密封圈固定在阀板上,这种蝶阀与传统蝶阀相比具有耐高温、操作轻便、启闭无摩擦、封闭时借助传动机构的扭矩来补偿密封、提高了蝶阀的密封性能,延长了使用寿命的优点。
蝶阀已广泛应用于石油、化工、冶金、水电等诸多领域,作为实现管道系统的开关和流量控制的一部分。在已知的蝶阀技术中,密封形式有密封结构,密封材料有橡胶、聚四氟乙烯等。由于结构特性的限制,不适合高温、高压、耐腐蚀、耐磨等行业。
有一种比较先进的蝶阀是三偏心金属硬密封蝶阀,看阀体和阀座都是连接部件,阀座密封面层堆焊焊温,耐腐蚀合金材料。多层软叠密封圈固定在阀板上,这种蝶阀与传统蝶阀相比具有耐高温、操作轻便、启闭无摩擦、封闭时借助传动机构的扭矩来补偿密封、提高了蝶阀的密封性能,延长了使用寿命的优点。但是这种蝶阀在使用中仍然存在以下问题:
因为多层软、硬堆密封圈固定在阀板上,常开阀板时,介质形成一个积极的密封表面的冲刷,软密封带和层间金属板的清洗,这直接影响密封性能。
受结构条件限制,该结构不适用于直径DN200以下的阀门,因为阀板整体结构太厚,流阻大。
三、由于三偏心结构的原理,阀板密封面与阀座之间的密封是通过传动装置的扭矩将阀板压到阀座上的。正向流动状态下,介质压力越高密封挤出越紧。当流道介质逆流随介质压力增大而增大时,阀板和阀座单元正压小于介质压力,密封开始泄漏。
高性能三偏心双向硬密封蝶阀的特点是:阀座密封圈由两侧多层不锈钢软t形密封圈组成。阀板与阀座密封面为斜锥结构,在阀板斜锥表面堆焊耐高温耐腐蚀合金材料;调节环压板之间的弹簧与压板上的调节螺栓组合在一起。该结构有效补偿了轴套与阀体之间的公差带和阀杆在介质压力作用下的弹性变形,解决了阀门在双向可互换介质输送过程中存在的密封问题。
密封圈由软性t型多层不锈钢板两侧组成,具有金属硬密封和软性密封的双重优点,在低温和高温下均具有零泄漏密封性能。试验证明,当介质的流动方向与蝶板的旋转方向一致时,密封面的压力是由传动装置的扭矩和介质对阀板的压力所产生的。正介质压力增大时,阀板斜锥面与阀座密封面挤压越紧,密封效果越好。当处于逆流状态时,阀板与阀座之间的密封通过驱动装置的扭矩将阀板压到阀

三偏心双向压硬密封蝶阀》有2,024条评论

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