O-type ball valve performance overview 1, the main features of O-type ball valve (1) small fluid resistance. Ball valves are generally reduced diameter, straight through the two structures, no matter what kind of structure, the ball valve fluid resistance coefficient is relatively small. Not reducing the ball valve for the through-ball valve, also known as the full flow type, the diameter of the channel is equal to the pipe diameter, resistance loss is only the same length of the pipe friction. This valve has the lowest fluid resistance among all valves. There are two ways to reduce the resistance of the piping system: one is to reduce the fluid flow rate by increasing the diameter and the valve diameter, which will greatly increase the cost of the piping system. Second, reduce the local resistance of the valve, the ball valve is the best choice. Increase diameter and valve diameter, which will greatly increase the cost of piping systems. Second, reduce the local resistance of the valve, the ball valve is the best choice. (2) switch quickly and easily. The valve can be opened or closed quickly by turning 90 degrees completely. (3) good sealing. The vast majority of ball seats are made of polytetrafluoroethylene and other elastic materials, metal and non-metallic materials made of sealing pair, commonly known as the soft seal. Soft seal has better sealing, and the sealing surface roughness and processing accuracy requirements are not high. (4) long life. Due to PTFE (F4 or F4) has good self-lubricating, the coefficient of friction with the sphere is small. Due to the improved processing technology to reduce the ball roughness, thus greatly improving the life of the ball valve. (5) high reliability. This is because: ①ball and the seat of a pair of seal will not be scratched, rapid wear and failure; ② stem to built-in type, eliminating the valve stem under the fluid pressure may be due to packing gland loose Open flight accidents hidden dangers; ③ anti-static, fire-resistant structure of the ball valve can be used to transport oil, natural gas, gas pipeline. (6) The ball valve is more suitable for conveying viscous fluids, slurries and solid particles due to the smooth and smooth passages in the valve body. 2, O-type ball valve components Description: (1) sealing surface material: room temperature temperature range: -20 ℃ ~ 100 ℃, the choice of PTFE (b4) b YR! Kr / DQ temperature temperature range: 120 ℃ ~ 280 ℃, choose PPL material: temperature, wear resistance, corrosion resistance, low friction coefficient. High temperature range: 300 ℃ ~ 425 ℃, the choice of metal hard seal material. (2) packing: room temperature selection of polytetraethylene. Medium temperature, high temperature type graphite molding material. Other ways: Asbestos textile packing, high temperature carbon fiber packing. (3) Spool form: O-shaped core. (4) gland form: bolt compression type. (5) connection methods and standards: different connection methods in line with the relevant connection standards. (Such as flange, threaded, GB standards, the United States, Japan, etc.)
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