Advantages and disadvantages of ball valves

by:Lianke Valve     2022-04-21
The advantages of the ball valve: 1. It has the lowest flow resistance (actually 0); 2. It can be reliably used in corrosive media and low-boiling liquids because it will not get stuck during operation (when there is no lubricant); 3. In a wide range of pressure and temperature, it can achieve complete sealing; 4. It can realize rapid opening and closing, and the opening and closing time of some structures is only 0.05~0.1s to ensure that it can be used in the automation system of the test bench . When the valve is opened and closed quickly, there is no shock in operation. 5. The spherical closing element can be automatically positioned at the boundary position; 6. The working medium is reliably sealed on both sides; 7. When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so it passes through the valve at high speed. The medium will not cause erosion of the sealing surface; 8. The structure is compact and light in weight, and it can be considered as the most reasonable valve structure for low temperature medium systems; 9. The valve body is symmetrical, especially the welded valve body structure, which can be well Withstand the stress from the pipeline; 10. The closing piece can withstand the high pressure difference when closing. ⑾The ball valve with fully welded valve body can be directly buried in the ground, so that the valve internals are not corroded, and the maximum service life can reach 30 years. It is the most ideal valve for oil and natural gas pipelines. Disadvantages of ball valves: 1. Because the most important valve seat sealing ring material of the ball valve is PTFE, which is inert to almost all chemical substances, and has a small friction coefficient, stable performance, not easy to age, and temperature applicable range. The comprehensive characteristics of Guanghe's excellent sealing performance. But the physical properties of PTFE, including high coefficient of expansion, susceptibility to cold flow, and poor thermal conductivity, require that seat seal designs must be built around these properties. Therefore, when the sealing material becomes hard, the reliability of the sealing is damaged. Moreover, PTFE has a low temperature resistance grade and can only be used below 180°C. Above this temperature, the sealing material will degrade. In the case of long-term use, it is generally only used at 120 °C. 2. Its adjustment performance is worse than that of globe valves, especially pneumatic valves (or electric valves).
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