Regarding the wing valve angle issue
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May I ask whether the wing valve angle refers to the angle when it is not open, or the angle at which the wing plate opens when the catalyst passes by?
The wing valve angle generally refers to the angle formed between the valve plate when it is closed and the vertical leg. :lol
It refers to the angle when it is not opened; a calibration angle is indicated on it at the time of manufacture. After installation and welding are completed, it is necessary to measure this angle again to ensure that the deviation between the valve stem and the leg is within the acceptable range – generally around 0.5 degrees