How to Deal with Internal Leakage and External Leakage of Stop Valve
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Release Time：2018-07-16
The external leakage is easy to handle. For the leakage of the middle flange, tighten the bolt of the middle flange again. If not, open the middle flange gasket to see if there is any damage. For the leakage of the packing, tighten the packing gland. If the packing is too loose, add the packing. If the leakage is directly on the body, the low pressure can be welded. If the high pressure needs to be abandoned, safety comes first. For the internal leakage problem, the situation cannot be determined. First, it may not be closed tightly. Close it again. Second, the valve seat seal is damaged. This needs to be reground. For valve core damage, it depends on whether it is washed out or damaged by medium impact, but both must be welded again.
The external leakage is easy to handle. For the leakage of the middle flange, tighten the bolt of the middle flange again. If not, open the middle flange gasket to see if there is any damage. For the leakage of the packing, tighten the packing gland. If the packing is too loose, add the packing. If the leakage is directly on the body, the low pressure can be welded. If the high pressure needs to be abandoned, safety comes first. For the internal leakage problem, the situation cannot be determined. First, it may not be closed tightly. Close it again. Second, the valve seat seal is damaged. This needs to be reground. For valve core damage, it depends on whether it is washed out or damaged by medium impact, but both must be welded again.
Internal leakage is usually caused by damage to the valve seat or valve core sealing surface. This can grind the valve seat or valve core sealing surface, but there is also a special case. If it is electric or pneumatic, the valve stroke may not be set properly. External leakage depends on where it leaks. If the valve body leaks, the valve can only be replaced.
If there is an internal leakage, there should be a problem with the sealing surface. Treat the sealing surface to see the effect.
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