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气动控制阀安装和维护

2月4，2019

气动控制阀安装和维护

Pneumatic control valves are the valves that are driven by compressed air. Pneumatic control valves are widely used in natural gas,chemical,metallurgical,petroleum and many other fields. Their stability and reliability are becoming more and more important. The quality of their working conditions will directly affect the automatic control process. Here we will introduce the installation and maintenance of气动控制阀。

首先，气动控制阀安装：

安装之前，应仔细检查气动控制阀。检查规格和型号，并确保没有损坏，尤其是对于阀杆。而且它需要几次转动以查看是否偏斜，因为它最有可能在运输过程中撞到阀茎。它还需要从阀门中清除碎屑。

抬起阀门时，绳索不应连接到手轮或阀杆上，以避免对这些零件的损坏，并应附着在法兰上。

Always clean the piping connected to the valve. Compressed air can be used to blow off iron oxide chips, mud sand, welding slag and other debris. These debris not only easily scratch the sealing surface of the valve, but also large particles (such as welding slag) can also block the small valve and make it invalid.

When installing a threaded pneumatic control valve, the sealing packing should be wrapped on the thread of the pipe. Do not get it in the valve to avoid accumulation in the valve and affect the circulation of the medium.

在安装法兰的气动控制阀时，请注意对称和均匀地拧紧螺栓。阀法兰和管法兰必须平行，清除是合理的，以避免压力过大甚至裂纹。特别注意不够强的脆性材料和阀门。要将要焊接到管道的阀门应首先进行焊接，然后应完全打开关闭构件然后焊接。

其次，气动控制阀维护：

1.清洁阀门：要清洁一般介质，只需用水洗涤即可。但是，要清洁对健康有害的媒体，首先了解其特征，然后选择适当的清洁方法。
2.拆卸阀：首先卸下裸露表面的生锈部分。在去除生锈之前，请保护阀座，阀芯，阀杆和其他精密零件的加工表面。使用特殊工具卸下阀座。
3. Valve core and valve seat: The two sealing surfaces have small rust spots and wear and can be repaired by mechanical processing. If the damage is serious, it must be replaced. However, it must be ground regardless of the hard seal surface after repair or replacement.
4, valve stem: surface damage, can only be replaced.
5.对推杆，导向和密封表面的损坏：必须更新反应执行器，并且在正确修复后可以使用正作用执行器。
6.Compression spring: If there are cracks and other defects affecting the strength, it must be replaced.
7. Vulnerable parts: packing, gasket and O-ring, all new when it is overhauled. The diaphragm must be checked for signs of cracks, aging and corrosion that may occur in the future. Depending on the inspection results, it is decided whether to replace it, but the diaphragm is generally used for 2-3 years.
8，气阀组件应注意对齐，应在对角线上拧紧螺栓，应润滑滑动零件。组装后，应根据出厂测试项目和方法进行调试。在此期间，可以更准确地调节填料压力，并且线轴闭合位置与阀门定位器一致。

Thirdly,Pneumatic Control Valve Fault Disposal:

Fault Phenomenon	检查项目	解决方案
Pneumatic control 阀不起作用	1.检查电磁阀是否正常，如果线圈被烧毁，如果螺线管阀芯被靴子粘住；	更换电磁阀，更换线圈， remove the dirt.
	2.检查一次空气供应的执行器，它是否正常工作，例如气缸活塞氦气，气缸和末端盖或轴等处的空气泄漏，等等拆卸执行器以检查密封是否损坏，以及气缸孔的表面是否受损；	更换不良密封件，更换气缸或活塞。
	3.阀中有杂质被困在核心中；	清除杂质，更换受损的阀门零件。
	4.The handle of the manually operated 执行器处于手动位置；	将手柄移至气动自动位置。
	5，管子被扭曲和扁平；	更正或更换管道。
	6.The media or ambient temperature is too low, causing the tubing to freeze.	及时清除冷凝水，添加拆除设备。
Pneumatic control 阀很慢	1.不足的空气供应压力；	增加空气供应的压力，并设置空气箱在降低压力变化的途中。
	2.The flow is not enough or there are other devices 消耗大量的空气供应；	添加一个汽油箱，并在 reduce pressure changes.
	3.功太小的致动器扭矩太小；	增加执行器规格。
	4.如果阀太重，组装是不合理的阀线轴或其他阀成分太紧。	重新修复，调整阀扭矩。
	5.圆柱摩擦的大小变化。	适当的润滑。
其他故障	1.当阀门动作,它会跳负载太大。	增加执行器规格。
其他故障	2.The valve jumps at the end of the action, 动作太快了，惯性能量太大了。	额外的速度控制阀或外部缓冲区。
限制开关没有信号	Signal power short-circuit	1.修复电路。
		2.Re-adjust the cam to the correct position.
		3.重新定位微型开关。