The hydrogen bellows stop valve K25FJ-1.6PA2 in the generator hydrogen oil-water system needs regular maintenance to check the integrity of the bellows. This work is a necessary skill for power plant specialists. Let’s talk about how to check and ensure the integrity of the bellows in detail.

The bellows is a key component in the stop valve K25FJ-1.6PA2. It is responsible for sealing to prevent hydrogen leakage, and also allows the valve stem to move up and down. The integrity of the bellows is directly related to the safety and efficiency of the entire system. Once the bellows is damaged, hydrogen leakage may occur at the least, and safety accidents may occur at the worst. Therefore, checking the integrity of the bellows is a big deal.

The first step is visual inspection. Remove the valve cover, expose the bellows, and carefully check if there are any cracks, dents, corrosion or foreign matter. The eyes are the windows to the soul, and sometimes, it is clear at a glance. If obvious damage is found, the bellows must be replaced, don’t hesitate.

The second step is airtightness test. This trick requires building a sealed space around the bellows and filling it with low-pressure gas, such as nitrogen. Then, apply soapy water to the surface of the bellows to see if there are any bubbles. If there are no bubbles, it means that the sealing is good; if there are bubbles, it means that the bellows has tiny cracks or holes. This step must be careful and don’t miss any suspicious points.

The third step is magnetic particle testing. This trick is suitable for bellows made of ferromagnetic materials. Apply magnetic suspension on the surface of the bellows and then apply a magnetic field. If there are cracks or defects, magnetic particles will gather at the defects to form visible traces. This method can detect subtle defects that are invisible to the naked eye and ensure the reliability of the bellows.

The fourth step is vibration testing. This trick requires the bellows to work at a vibration frequency under simulated working conditions for a period of time and observe the response of the bellows. If the bellows has cracks or fatigue damage, it is easy to expose under vibration testing. This step requires special equipment and data analysis, which is highly technical.

Engineers have mastered these methods and can ensure the integrity of the bellows through regular inspections. Don’t wait until something goes wrong before you regret it, prevention is always better than remedy.

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