Protection of the flange surface
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Protection for the flange surface: Using tape doesn’t work well as it’s difficult to remove – is there a better method?
Use a rubber gasket; I just saw it today but didn’t take a photo of it. It’s right-angled, and you cut it to the desired length, wrap it into a circle, and insert it inside
Manufacturers of valves attach a thin plastic sheet to the flange surface of the valves; this can serve as a reference for purchasing something to protect the flange sealing surface.
A thin plastic sheet can be placed on the flange surface of the valve; one can use this as a reference to purchase something to protect the flange sealing surface.
Rubber patches are generally used; I heard that Fujin Guoxin Hardware sells them