Wenzhou Longzhu specializes in the production of valves. Before describing the advantages and disadvantages of ball valves, let's first understand the concept of products. The ball valve is evolved from the plug valve. Its opening and closing part is a ball. The ball is rotated 90 ° around the axis of the stem to open and close. The ball valve is mainly used to cut off, distribute and change the direction of medium flow on the pipeline. The ball valve with V-shaped opening also has good flow regulation function.
① With the lowest flow resistance (actually 0); ball valve manufacturer
② It can be used in corrosive medium and low boiling point liquid reliably because it will not stick when working (when there is no lubricant);
③ In a large range of pressure and temperature, it can achieve complete sealing;
④ It can realize fast opening and closing, and the opening and closing time of some structures is only 0.05 ~ 0.1s, so as 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 impact during operation;
⑤ The spherical closure can be positioned automatically at the boundary position;
⑥ The working medium is sealed reliably on both sides;
⑦ When the valve is fully open 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 the erosion of the sealing surface;
⑧ Because of its compact structure and light weight, it can be considered as the most reasonable valve structure for low temperature medium system;
⑨ The valve body is symmetrical, especially the welded valve body structure, which can well bear the stress from the pipeline;
⑩ The closing piece can withstand the high pressure difference during closing. (11) the ball valve with fully w elded valve body can be directly buried in the ground, so that the internal parts of the valve are not eroded, and the maximum service life can reach 30 years. It is the most ideal valve for oil and gas pipelines.
① Because the most important sealing ring material of the valve seat is polytetrafluoroethylene, it is inert to almost all chemical substances, and has the comprehensive characteristics of small friction coefficient, stable performance, not easy to aging, wide range of temperature application and excellent sealing performance. But the physical characteristics of PTFE, including high expansion coefficient, sensitivity to cold flow and poor thermal conductivity, require that the design of valve seat seal must be based on these characteristics. Therefore, when the sealing material becomes hard, the reliability of the seal will be damaged. Moreover, the temperature resistance grade of polytetrafluoroethylene is low, and it can only be used under the condition of less than 180 ℃. Beyond this temperature, the sealing material will age. In consideration of long-term use, it is generally not used at 120 ℃.
② Its regulating performance is worse than that of stop valve, especially pneumatic valve (or electric valve)
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