Advantages: (1) has the lowest flow resistance (the actual is 0); (2) because in the work will not get stuck (in the absence of lubricant), it can be used reliably in corrosive media and low boiling liquid; (3) in a large range of pressure and temperature, can achieve a complete seal; (4) can achieve fast opening and closing, 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 bed. Quick opening and closing valve, no impact operation. (5) spherical closure can be automatically positioned on the boundary position; 6 working medium on both sides of the seal is reliable; 7 in full open and closed, the ball and valve seat sealing surface and medium isolation, so high speed through the valve medium will not cause sealing surface erosion; 8) has a compact structure, light weight, it can be considered as the most reasonable valve structure for low temperature medium system; Pet-name valve body symmetry, especially the welded valve body structure, can well withstand the stress from the pipe; Attending the closing part can bear the high-pressure difference of the closing. 2 whole welding valve body ball valve, can be directly buried in the ground, make the valve parts without erosion, the maximum service life of up to 30 years, is the most ideal oil, natural gas pipeline valve.
Disadvantages: (1) because the ball valve the most important valve seat sealing ring material is teflon, it is almost all of the chemicals are inert, and has a small coefficient of friction, performance stability, not easy to aging, temperature range of application and excellent comprehensive characteristics of sealing performance. But the physical properties of ptfe, including high expansion coefficient, sensitivity to cold flow, and poor thermal conductivity, require that the design of seat seals must be built around these characteristics. Therefore, when the sealing material becomes hard, the reliability of the seal is damaged. And, of ptfe heat resistance level is low, can only be used under the condition of less than 180 ℃. Beyond this temperature, the sealing material will age. And under the condition of long-term use, general will only be used under 120 ℃. (2) its regulating performance relative to the globe valve is poor, especially the pneumatic valve (or electric valve).
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