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Electric control valve core and valve seat clearance is too small
The author: Time:2021/6/3

  (1)故障现象:废液槽压力放空调节阀已全开,但废气仍无法排出。
  (2)现象分析:将该放空电动调节阀解体检查,发现阀内有较多的废液积存,除此之外并无脏物堵塞等情况,由于废液槽的气相排放量并不大,因此通常采用阀芯为针型的调节阀,阀芯头部有一段起导向作用的圆柱形杆,它与阀座之间形成了间隙很小的环状空隙。由于气相中带有较多废液,造成阀座内及上述环状空隙中存有废液,造成了液封作用。该调节阀的前后压差较小,约为0.1MPa ,从而使阀门的流通能力减小,即使阀门全开时,由于环状空隙的液封现象仍存在,气体不能畅通,因此呈现堵塞现象。
  (3)处理方法:采取临时措施,将阀芯位置抬高,当阀门全开时,使阀芯头部的导向杆脱离阀座,消除环状空隙现象,使介质排放畅通;但此时调节阀控制特性变差,导向杆无法起到导向作用。因此,较好的解决方法是将导向柱杆的直径减小,以增大环状空隙,使阀门的流通能力增强。

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