How to deal with leakage leakage in the shutoff valve

Leakage fortunately deal with, for the leakage of the flange, the flange of the flange again tighten, if not enough, we must open to see if the flange gasket is damaged, for the leakage at the packing, tight packing gland If the filler is too loose, it must be filled again. If it is directly on the body, it will leak. If the pressure is low, then it can be welded. If it is high pressure, give it up directly. Safety, for the endoleak problem, the situation is not well established. Did not close dead, and then force it off, second, the valve seat seal is damaged, this will have to re-grind, for the valve core damage, depends on the scouring damage or the media impact damage, but both must be re-welded seal surface.
The inner leakage is generally a damage of the valve seat or the sealing surface of the valve core. This can grind the valve seat or the sealing surface of the valve core, but there is also an special case where the valve stroke may not be set properly if it is electric or pneumatic. Leakage to see where leakage, if the valve body leakage can only change the valve.
Inside leakage should be a problem with the sealing surface, the sealing surface treatment to see what effect