Soft seal ball valve hard seal ball valve use difference: mainly structural, valve manufacturing standards are not the same. First, the ball valve structure mechanism The hard seal of the ball valve is the seal between metal and metal, the sealing ball and the valve seat are all metal. Reference materials: Processing accuracy and process are difficult, generally used in high pressure, usually more than 35MPa. A soft seal is a seal between metal and non-metal, such as nylon\tetrafluoroethylene, which is manufactured to the same standard. Second, the ball valve manufacturing process due to a lot of chemical, mechanical industry's working environment is more complex, many are high temperature and high pressure, the medium's frictional resistance is large, corrosive, and now the technology has improved, the use of various materials is better, Processing and other aspects can be kept up, so that the hard-sealed ball valve has been widely promoted. In fact, the principle of the hard seal ball valve is the same as that of the soft seal. It is only because of the seal between the metals, considering the hardness relationship between the metals, as well as the working conditions and what medium to go. Hardening is generally required, and the ball and the seat are continuously ground to make it seal. Hard seal ball valves have a long production cycle and are complicated to process. Hard seal ball valves are not easy to do. Third, the ball valve ball valve sealing material Soft and hard seal is for the sealing material of the valve seat, the hard seal is precisely processed with the valve seat material to ensure the matching precision with the valve core (sphere), generally stainless steel and copper. The soft seal means that the sealing material embedded on the valve seat is a non-metallic material. Because the soft sealing material has a certain elasticity, the processing precision requires a relatively hard seal to be low. Fourth, the use of ball valve soft seals can generally achieve a high degree of sealing, while hard seals can be high or low according to requirements; soft seals need to be fireproof, because at high temperatures, soft seal materials will leak, while hard seals There is no such problem; hard seals can generally do very high pressure, soft seals can't; soft seals can't be used in some occasions due to the problem of the medium being flowed (such as some corrosive media); finally hard-sealed valves are generally softer than Sealed expensive. As far as manufacturing is concerned, the difference between the two is small, mainly due to the difference of the valve seat, the soft seal is non-metal, and the hard seal is metal. 5. In the selection of equipment, the soft and hard sealing ball valve is mainly based on the process medium, temperature and pressure. Generally, the medium contains solid particles or has a wear or temperature. The temperature is higher than 200 degrees. It is best to use a hard seal. The diameter of the valve is greater than 50. It is also considered to open the valve torque. When the torque is large, the fixed hard seal ball valve should be used. The seal level of the soft and hard seal can reach 6 levels.