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应用知识
楔式闸阀的密封原理
发布时间:2013-09-09 12:05:12
楔式闸阀的密封原理是靠楔形闸板上的两密封面和阀体上的两密封面楔入时的紧密结合来达密封的。使用楔形闸板的目的是为了提高辅助的密封载荷,以使金属硬密封楔式闸阀既能对高介质压力,也能对低介质压力进行密封。关闭时顺时针旋转阀杆,使闸阀密封面和阀体密封面密合而达到密封。但是,金属密封的楔式闸阀由楔入作用所产生的进口端密封比压受到介质的作用力往往不足以达到进口端密封.所以说金属密封楔式闸阀属单面强制密封。
  楔式闸阀应用范围:楔式闸阀广泛适用于石油化工,火力发电厂等油品、水蒸气管路上作接通或截断管路中介质的启闭装置。
  在各种类型的易胜博官方网站中,闸阀是应用最广泛的一种。它一般只适用于全开或全闭,不能作调节和节流使用。
 
  楔式闸阀一般用在对易胜博官方网站的外形尺寸没有严格要求,而且使用条件又比较苛刻的场合。如高温高压的工作介质,要求关闭件要保证长期密封的情况下等。
 
  通常,使用条件或要求密封性能可靠,高压,高压截止(压差大)、低压截止(压差小),低噪声、有气穴和汽化现象、高温介质、低温(深冷)时,推荐使用楔式闸阀。如电力工业、石油炼制、石油化工、海洋石油、城市建设中的自来水工程和污水处理工程,化工等领域中应用较多。
 
  楔式闸阀结构特点:
    1、结构紧凑、设计合理、易胜博官方网站刚性好、通道流畅,流量系数小 
    2、密封面采用不锈钢和硬质合金,使用寿命长 
    3、采用柔性石墨填料、密封可靠,操作轻便灵活 
    4、驱动方式为手动、气动、电动、齿轮传动 
    5、结构形式为弹性楔式单闸板、刚性楔式单闸板双闸板型式
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