Handle the end of the valve leakage or leakage: leak better treatment, the flange leaks, the flange bolts and then tighten, if not enough, we must open to see whether the flange gasket damage , The filler at the leak, the tight packing gland, if the packing is too loose, we must add filler, if the body is directly on the drain, low pressure, then you can weld it, if it is high pressure to give up it directly, safety first, For the internal leakage problem, the situation is not good to determine, first, may not be closed, and then closed again, and second, seat seal damage, this will be re-grinding, for the spool damage, depends on erosion damage or Impacted by the media damage, but both have to re-weld the sealing surface. Internal leakage is generally the valve seat or spool sealing surface damage, this can grind the valve seat or spool sealing surface, but there is an ad hoc situation if the electric or pneumatic may be the valve stroke is not set. Leakage depends on what leakage, if the valve leakage on the body can only change the valve. Internal leakage should be the sealing surface problems, the sealing surface treatment to see if the effect of leakage, the valve is different from the different locations, should be treated at the filler at the leakage, tighten or replace the filler, we often can not Parking is using pressure plugging. There are many cut-off valve leaks, leakage in most cases is from the gland leakage, the gland to open to add or replace the filler and then gland should not leak. Internal leakage is inside the spool on the sealing surface is broken, but the actual experience tells us that sometimes leakage may have hard objects stuck in the valve above, resulting in internal leakage, the specific approach is to open the valve and then closed A few times to go back and forth on the hard object on it. If the valve itself is the problem, we must choose the right time to replace the valve.