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The valve body and the valve cover are leaking
The possible reasons are: flange joint bolt fastening uneven flange tilt, or fastening bolt tightening force is not enough, valve body and valve cover connection surface damage; Gasket is damaged or does not meet the requirements; Flange joint surface is not parallel, flange processing surface is not good; Stem bushing and stem thread add I** to tilt the bonnet.
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