Valve type
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What type of butterfly valve is this shaft-sealed butterfly valve called? Who has the drawings for this type of butterfly valve? Is the seal an O-ring?
Flanged butterfly valve; you can search for it on Baidu
It’s necessary to take it apart to determine what type it is
Sealing rings generally use packing, right?
You can find the model number by checking the nameplate; just do a search on Baidu and that’s it. It’s impossible to tell just by looking at it from a distance
From the picture, it appears to be a flanged butterfly valve; it’s not clear whether it has a soft seal or a hard seal. The information on the nameplate can provide some clues
It should be a three-eccentric multi-layer sealed butterfly valve
It’s a regular centerline butterfly valve; most of them have EPDM seat rings