Valve application: how to deal with the internal leakage or external leakage of the globe valve

External leakage is easy to deal with. For the leakage of the middle flange, tighten the bolts of the middle flange again. If it still does not work, open the middle flange gasket to see if the middle flange gasket is damaged. For the leakage of the packing, tighten the packing gland , If the packing is too loose, add more packing. If it is leaking directly on the body, it can be welded if it is under low pressure. If it is high pressure, just give up. Safety first. For internal leakage, the situation is not easy to determine. First, it may not be closed, and then close it hard. Second, if the valve seat seal is damaged, this must be re-ground. For the valve core damaged, it depends on whether it is damaged by scouring or by the impact of the medium, but both Re-weld the sealing surface.

Internal leakage is generally caused by damage to the valve seat or valve core sealing surface. This can be used to grind the valve seat or valve core sealing surface. However, there is a special case that if it is electric or pneumatic, the valve stroke may not be set properly. External leakage depends on where the leakage occurs. If the valve body leaks, the valve can only be replaced.

If there is internal leakage, there should be a problem with the sealing surface. Treat the sealing surface to see the effect

If there is leakage, different valves and different leak locations must be treated differently

If the packing leaks out, tighten it or replace the packing. In many cases, we cannot stop the machine and use the leak plugging under pressure.

The shut-off valve has many leakage points. In most cases, the external leakage is from the gland. Open the gland to replenish or replace the packing and then tighten the gland. There should be no leakage. Internal leakage means that the upper sealing surface of the inner valve core is broken, but actual experience tells us that sometimes the internal leakage may be a hard object stuck on the valve core, causing internal leakage. The specific treatment method is to open the valve and then close it. , Just wash away the hard objects several times back and forth. If it is the problem of the valve itself, it is necessary to choose a suitable time to replace the valve.