How to stop leaks in valve packing?
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I have a DN50 steel-lined PTFE globe valve here, and there is leakage at the packing area. How can I stop this leakage?
Tighten the packing compression device, or use a pressure-based method to seal the leak
If conditions permit, it is best to replace the packing or even the valve； If the valve is continuously handling fluid, then one can only tighten the packing gland bolts, but the effect is limited, especially when the packing is severely damaged. I’m not sure what’s meant by plugging leaks under pressure, as mentioned on the 2nd floor Can the filler area be sealed with glue? Will it still be needed then?
Agree with the opinion from the third floor. Replacing the packing or replacing the valve is a simple solution. “I also don’t understand “plugging leaks under pressure”.
Several valves in our facility have experienced packing leaks; the medium used is steam, and the leakage volume was quite high. We then hired a professional leak sealing company to carry out leak repair under pressure, and the results were excellent. The method involved drilling holes at the valve’s packing box under pressure and injecting glue there.
1 valve for plugging leaks under pressure. I guess the price is quite high. Unless necessary, just replace it directly
Sealing leaks is not a problem; it depends on your specific requirements!
1. I generally agree with the method suggested by Step on Snow to Leave Traces, but I’m not sure what the methods for sealing leaks using glue are, as I have never used them before. 2. Personally, I think it’s possible to use permanent adhesive on the outside of the valve rather than at the sealing gasket area; since the gasket seal needs to move frequently, the adhesive might not work as well there. 3. If the poster cannot stop and must handle it right away, and if they are unable to keep a tight seal, then they can loosen the screw that holds the seal in place, replace the packing material, fill it in evenly again, and then tighten it. Provided that the medium pressure is not too high, within 2 kilograms, it is generally fine.
Generally, using glue for filling is a better approach! ! However, considering the possibility of a chemical reaction between the adhesive and the medium inside, it is more practical to tighten the screws during production! ! It must be replaced during maintenance! ! !
The direct method is to inject glue at the filler area.
Tighten the packing compression device, or use a pressure-based method to seal the leak
What the poster means is that the material must flow continuously through the pipeline without any interruptions, or perhaps the material is highly corrosive or toxic, making it difficult to replace the valves. For such important valves, it’s safer to use dual valves... What about tightening the packing gland? If that doesn’t work, then it might be necessary to seek professional help for injecting sealant; I’ve not tried this method before, so I’m not sure about its effectiveness. If frequent operations are required, there are likely still to be problems
To stop leaks in the packing of a globe valve, if the leak is minor, tightening the nuts on the packing plate will suffice; if the leak is severe, the packing needs to be replaced. The procedure for replacing the packing while the valve is under pressure is as follows: First, open the valve to its highest position. Both globe valves and gate valves are designed with a mechanism that facilitates packing replacement. Second, remove the nuts on the packing plate, lift the plate to access the damaged packing, install new packing, and then tighten it in place. If an O-ring PTFE packing is used, cut the middle of the packing ring to open it and insert it.
It depends on the actual conditions of your production: if the medium is something like water at room temperature, it is possible to replace the packing or remove it for replacement. If it cannot be shut down, then, depending on the actual situation, more packing should be added or the packing should be tightened directly. Finally, there is plugging the leak while the system is under pressure. In fact, there’s no need to worry about injecting glue into the packing, as once there’s an opportunity to stop the system, the leak must definitely be addressed.
I want to replace the packing. Should the valve be completely closed or completely open?
It’s better to keep it open; if it’s closed tightly, the packing might be pushed out during operation. Also, never use packing under pressure – it’s extremely dangerous.
Fill the packing with asbestos rope and then compress it.
Here we also use imported packing material in place of asbestos rope, and the results are very good as well
If there is a leak in the valve packing, it is usually sufficient to replace the packing and tighten it again. Pressure-based leak sealing is now a relatively mature technology and can be used without issues, but it is expensive; the cost of sealing one device is enough to purchase one or two valves, making it not very cost-effective
As long as the medium pressure is not high, the packing can be replaced directly, but it’s not necessary to replace it entirely
Weld a joint and apply sealant; if you can’t do it yourself, hire a professional leak repair team