Pneumatic valve maintenance
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I would like to ask an instrumentation expert: What are the key points for maintaining pneumatic valves? What points should be noted? Thank you!
Replacement of wear parts, such as packing and actuator seals
The pressure of the pressure relief valve should be checked daily, and water should be drained regularly to prevent water from entering the air supply; especially in winter, the presence of water can cause the entire valve to fail. Oil can be added to the cylinder during shutdown for maintenance purposes to maintain lubrication, and more oil can be applied to all moving parts such as the valve stem. It is important to ensure that the positioners and wiring boxes are sealed, otherwise water ingress due to rain can cause problems. That’s all I can think of for now; please go ahead and add more. It’s a bit messy; just give it a quick look
The circuit requires little maintenance; it’s sufficient to keep the air clean and the mechanical components in good working condition
What’s there to maintain? If something goes wrong, just fix it
For pneumatic valves, it is necessary to be familiar with the structure of the related components as well as the potential failure points. Power is provided by air; therefore, it is necessary to pay attention to the requirements related to this aspect: moisture, oil content, pressure, etc. For components such as positioners, solenoid valves, and directional control valves, it is important to understand their working principles, sources of power, and typical failure patterns. Cylinders, diaphragm heads, valves: What is their structure? Under what conditions do they fail to function? Why don’t they work? It’s better to become more familiar with the actual operating conditions on site—think carefully about any problems that arise!