The difference between elastic soft seal and hard seal of gate valve

1. In terms of structure and mechanism: hard seal is the seal between metal and metal, and the sealing sphere and valve seat are all metal. The machining accuracy and process are difficult, and it is generally used in high pressure, usually above 35MPa. Soft seal is metal and non-metallic. The sealing between metals, such as nylon tetrafluoroethylene, is the same as the manufacturing standard. 2. On the sealing material: the elastic soft sealing gate valve and the hard sealing gate valve are for the sealing material of the valve seat, and the hard sealing is the valve seat The material is precision machined to ensure the matching accuracy with the valve core (ball), generally stainless steel and copper. Soft sealing means that the sealing material embedded in the valve seat is non-metallic material. Because the soft sealing material has a certain elasticity, it is not suitable for processing. The precision requirements are relatively low compared to hard seals. 3. Due to the complex working environment of many chemical and mechanical industries in the manufacturing process, many of them are high temperature and high pressure, the friction resistance of the medium is large, and the corrosiveness is strong. Now technology has advanced, various materials The application of the ball valve is better, and the processing and other aspects can keep up, so that the hard-sealed ball valve has been widely promoted. In fact, the principle of the hard-sealed ball valve is the same as that of the soft-sealed ball valve, but because it is a metal seal, it must be considered The hardness relationship between the metals, as well as the working conditions, what medium is used, etc. are generally required to be hardened, and the ball and the valve seat must be continuously ground to achieve sealing. The production cycle of hard-sealed ball valves is long, and the processing is relatively Complex, hard-sealed ball valves are not easy to do well. 4. In terms of use conditions, soft seals can generally achieve high seals, while hard seals can be high or low according to requirements. Soft seals need to be fireproof, because at high temperatures, the material of soft seals Leaks will occur, but hard seals do not have this problem. Hard seals can generally do very high pressures, but soft seals cannot. Soft seals cannot be used in some occasions (such as some corrosive media) due to the problem of the flowing medium. .Finally, hard-sealed valves are generally more expensive than soft-sealed valves. As for manufacturing, there is little difference between the two, mainly the difference in valve seats. Soft seals are non-metallic, and hard seals are metal. 5. Soft and soft seals are used in equipment selection. The selection of hard-sealed ball valves is mainly based on the process medium, temperature and pressure. Generally, the medium contains solid particles or has wear or the temperature is higher than 200 degrees. It is best to use hard-sealed ball valves. When the size is larger, a fixed hard-sealed ball valve should be used, and its sealing level can reach level 6 regardless of the soft or hard seal.
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