What material of packing is less likely to leak?
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The medium flowing through the pipes I use is oil. The valves are gate valves, and they started leaking again shortly after the packing was replaced. What type of material for the packing would be less likely to cause leaks? This post was last edited by Drifting in the north on 2009-1-6 at 14:50
What are you using now? How much pressure? We use oil-impregnated graphite packing with a pressure of 0.4 MPa. There have been no leaks. Additionally, after installing the packing for the first time, it’s not necessary to tighten it too much; wait until the pressure in the pipeline stabilizes and then adjust the tightness as needed, leaving some slack. To make it easier to tighten next time.
It depends on your operating conditions; temperature and pressure are very important
The pressure I use is around 0.4 Mp, at room temperature
When it comes to the method of replacing the packing, attention must also be paid to this; it is also very important. This forum has guidelines regarding the addition of fillers. You can see it by searching
Graphite is generally a good choice for valves in the oil industry. The method on the 2nd floor is very suitable.
At a pressure of 0.4 Mp, oil-impregnated graphite packing is more than sufficient for normal operating conditions, and there should be no leaks. Possible reasons for leaks include: 1. The length of each ring of packing should be appropriate – neither too long nor too short; 2. The cuts on the packing must be made at an angle of about 45° to the length direction of the packing, with the cut angles at both ends being as consistent as possible; 3. The joints between adjacent rings of packing should be filled at an angle of 180°; 4. The tightening degree of the packing gland should be moderate – neither too tight nor too loose. After installing the packing for the first time, it can be loosened slightly, and then the tightening level can be adjusted gradually once the pressure in the pipeline stabilizes; 5. Another factor to consider is the quality of the packing itself. In summary, the main causes of leaks are usually related to installation and adjustment issues.