Advantages: ① has the lowest flow resistance (actually 0); ② is not stuck when working (in the absence of lubricant) Therefore, it can be applied reliably in corrosive medium and low boiling liquid, and the ③ can be fully sealed in the range of pressure and temperature, the ④ can realize the rapid opening and closing, and the open and close time of some structures is only 0.05~0.1s, To ensure that it can be used in the automation system of the test bed. Fast opening and closing valve, the operation without impact. The ⑤ spherical closed parts can be positioned automatically at the boundary position, and the ⑥ working medium is sealed reliably on both sides; ⑦ the sealing surface of the ball and the seat is separated from the medium in full open and closed, so the medium with high speed through the valve will not cause the erosion of the sealing surface; ⑧ Compact and lightweight It is considered that it is the most reasonable valve structure for cryogenic medium system, the ⑨ valve body symmetry, especially the welded valve body structure, can withstand the stress from the piping well, and the ⑩ close part can withstand the high pressure difference when it closes. ⑾ fully welded valve body ball valve, can be buried directly in the ground, so that the valve is not immersed in the corrosion, the maximum service life of up to 30 years, oil, natural gas pipeline is the most ideal valve.
Disadvantage: ① because the ball valve is the most important valve seat sealing material is PTFE, it is inert to almost all chemical substances, and has a small friction coefficient, stable performance, not easy to aging, wide range of temperature application and excellent sealing performance of the comprehensive characteristics. However, the physical properties of PTFE, including higher coefficient of expansion, sensitivity to cold flow and poor heat conductivity, require that the design of the seat seals be carried out around these characteristics. Therefore, when the sealing material hardens, the reliability of the seal is damaged. Moreover, the temperature resistance of PTFE is lower and can only be used in less than 180 ℃. More than this temperature, the sealing material will be aging. And considering the long-term use of the case, generally will only be used in 120 ℃. ② its adjustment performance relative to the cut-off valve to some, especially the pneumatic valve (or electric valve).
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