The stem of the butterfly valve is severely corroded – can it still be used?
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The butterfly valve is severely corroded by rainwater; will this affect its sealing? Should it be replaced immediately?
Sealing won’t be affected, but it’s recommended to replace it
The valve stem seal is not greatly affected, but with such corrosion, the support is under stress, which affects the valve’s movement; the support might get damaged as a result
The valve no longer meets the requirements in terms of pressure resistance and structural strength; it needs to be replaced. It is recommended to conduct a corrosion inspection on the pipeline it is connected to as well
In this case, both the bracket and the gland have been corroded; the sealing is not affected, but there will be leakage at the packing area. At that time, the valve stem will also get stuck. It is recommended to replace it.
Bro, it’s better to change it; it’s too unsafe
In your case, you need to scrape off the rust and see how much corrosion has occurred in order to determine it. When steel rusts without any constraints, its volume can increase by dozens of times; therefore, it may seem frightening at first, but in reality it’s not that serious. The direct way to determine whether rusting is a problem is to measure the thickness of the remaining material and calculate its strength. If the computing conditions are lacking, it is not advisable to use it if there is a 1/10 reduction ； Based on a general visual inspection, if the surface is relatively smooth after rust removal, with a few pits or patches of pits whose diameter is less than 2 mm, there is usually no problem ； There are large pits, but their depth is less than 1 mm and they are not connected; in less critical situations, it may be possible to continue using it ； If it’s a pit falling into another pit, no flat surface can be found. When it is impossible to measure or calculate, it is best not to continue using it. .
The strength is affected, which constitutes a safety hazard; it must be replaced to prevent loss of control during operation or valve cover failure that could lead to material leakage!
The view from the 7th floor is correct; it is recommended to remove the corroded parts, apply anti-corrosion treatment again, and carry out regular maintenance on the bolts to prevent corrosion
It must be replaced immediately; once it leaks, it is not easy to repair.
It’s been over 10 years in use; it’s time to replace it