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The main contents of maintenance of pneumatic closed control valve
The author: Time:2020/4/23

气动闭式调节阀检修的主要内容包括:
  (1)检查阀头与阀座是否结合良好,密封面如有冲刷沟擦伤等缺陷,应根据缺陷程度不同,选择研磨或补焊加二工处理,处理后的阀头、阀座,做结合试验,要求圆周接触,阀线清晰;
  (2)检查阀杆表面,应光滑、无损伤,测量弯曲度,应在0.1mm之内;
  (3)检查导向套筒与阀头配合处,有无拉伤沟痕、毛刺等缺陷,如有应用砂纸,将毛刺、拉伤部位打磨光滑,使阀头在导向套筒内的运动无阻碍;
  (4)检查阀体、阀盖有无砂眼、裂纹、冲刷等缺陷,如有应将缺陷部位挖去,补焊处理;
  (5)测量阀杆与金属环之间的间隙,应在0.2~0.3mm之间,测量盘根压盖与填料室的间隙,应在0.2~0.3mm之间;
  (6)执行机构隔膜应无破损老化等现象,否则应更新,检查测量弹簧自由状态下长度是否与设计尺寸相符,端面是否平行,可用小锤敲打听声音,应清脆无嘶哑声,对有缺陷的弹簧,若是达不到技术要求的必须更换;

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