Leakage at the butterfly valve shaft head
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The possibility of leakage at the shaft end arises when the pipes and bolts used to secure the valve are not installed aligned with the center of the valve, but instead at an angle. This angular installation can cause uneven pressure on the rubber components, altering the sealing fit between the valve seat, valve disc, and valve shaft, which in turn affects the valve’s sealing performance and leads to leakage. Why misalignment during installation causes leakage at the shaft end? Technically, the top part is the weakest point, and leakage starts from there. But the people at the construction site will think it’s a product issue, and their explanations don’t make sense. And reinstalling does ensure no leaks. Is there anyone who can analyze the reasons in detail? Why improper installation causes leakage at the valve shaft first
Based on the description, it seems to be a butterfly valve with a soft seal along the center line; leakage of the type you described does indeed occur when there is pressure imbalance at the flanges. The medium enters through the gap between the valve seat and the valve body