Advantages:
① Low flow resistance (actually 0);
(2) It can be used in corrosive medium and low boiling point liquid because it will not be stuck when working (no lubricant);
③ Complete sealing can be achieved in a wide range of pressure and temperature;
④ It can be quickly opened and closed, and the opening and closing time of some structures is only 0.05~0. 1s, which is guaranteed to be used in the test-bed automation system. When the valve opens and closes quickly, it has no influence on the operation.
⑤ The spherical head can be automatically positioned at the boundary position;
⑥ Double-sided sealing;
⑦ When the valve is fully opened and closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface;
⑧ Compact structure and light weight can be considered as a reasonable valve structure for cryogenic medium system;
Pet-name ruby valve body symmetry, especially the welded valve body structure, can well bear the stress from the pipeline;
Attending the closing part can withstand the high pressure difference when closing.
The ball valve with fully welded valve body can be directly buried underground, so that the internal parts of the valve are not corroded and the service life can reach 30 years. It is an ideal valve for oil and gas pipelines.
Disadvantages:
① Because the main seat sealing ring of the ball valve is made of PTFE, it is inert to almost all chemicals, and has comprehensive characteristics of low friction coefficient, stable performance, difficult aging, wide temperature application range and excellent sealing performance. However, the physical characteristics of PTFE, including high expansion coefficient, sensitivity to cold flow and poor thermal conductivity, require the design of valve seat seal around these characteristics. Therefore, when the sealing material hardens, the sealing performance is destroyed. Moreover, PTFE has low temperature resistance and can only be used below 180℃. Above this temperature, the sealing material will age. Considering the long-term use, it will only be used at 120℃.
② Its regulating performance is worse than that of cut-off valve, especially pneumatic valve (or electric valve).
The article comes from: advantages and disadvantages of several valves-technical article