a.the tightening size is not in place, the size is uneven (the size deviation shall not be greater than 3 mm) or the clamping bolt is loose;



b.Part of the gasket is separated from the sealing groove, there is dirt on the main sealing surface of the gasket, the gasket is damaged or the gasket is aged;



c. the plate is deformed, and the assembly dislocation causes the running pad;



d. there are cracks in the sealing groove of the plate or the second sealing area.