In fact, if we want to ask which factories have such concerns, it is really quite a lot, because we see some petrochemical plants, some chemical plants, in fact, they basically need to use automatic ball valves, otherwise they will not be so worried, if they use another place, Or will some other valves cause great harm to the leakage of their own products, because if such things leak out, the problem is really big, not only will it affect the life safety of some people in heaven, but also the most important thing is that it will affect our future life, There is also a great harm to our environmental pollution. But if we use this method, all this will not happen. Many factories feel very happy.

2、 Selection of sealing surface
(1) Face to face sealing: for common plunger valve cores, the sealing surface is a small cone at 60 ℃, and the valve seat is also a small cone at 60 ℃. The width of this small cone is usually between 0.5mm and 2mm. To seal well, it is necessary to ensure that the two cones are in good contact. But in fact, it is always affected by processing errors (such as centrality, out of roundness, inclination, etc.), and its sealing effect is not very ideal. The leakage rate of this type of valve is usually 10-4, and it can reach 10-6 after precision grinding, which can only achieve a better sealing level.
(2) Spherical sealing: the spherical rotation of the valve core is tangent to the small conical surface of the fixed valve seat, and they are in line contact, which is better than the above face-to-face sealing. The full function ultra light valve and spherical sealing butterfly valve launched by Hualin Company are made with this idea. Its leakage rate can reach 10-6~10-8, and the high-performance tri eccentric butterfly valve can reach 10-8, or even zero leakage.