Rectangular non electric ball valve is a very common type of electric ball valve, which is widely used in industry. Many customers said that what would affect the fatigue life of the electric ball valve? Gongyi Dongfeng Equipment Manufacturing Co., Ltd. explained to you that too low fatigue life would lead to a decline in pipe stability and corrosion resistance. According to the test and use experience, the fatigue life of the rectangular non electric ball valve used for heat supply engineering shall not be less than 1000 times. The pipe cannot bear the load and should be hoisted separately; In addition to the pre deformation amount required by the design for pre stretching or cold tightening, it is strictly prohibited to adjust the installation deviation of pipes by means of deformation of pipes; During installation, welding slag shall not splash on the pipe surface and be subject to other mechanical damage; All flow elements of the rectangular non electric ball valve shall not be blocked by external components or restrict the normal operation of its flow parts. Several factors affecting the fatigue life of rectangular non electric ball valves.
1. Design impact: The rectangular non electric ball valve is thin. When the thickness increases, the bending stress caused by its displacement will decrease, so its fatigue life will increase. However, the thickness of the non electric ball valve meets its pressure bearing requirements.
2. Data and influence of heat treatment: experiments show that the fatigue performance of the annealed tube electric ball valve is much worse than that of the unannealed tube electric ball valve when it is low cycle fatigue, and its life is about 1-2 orders of magnitude worse.
3. Influence of manufacturing quality: the thickness of pipe wall is reduced by forming, and the fatigue life of electric ball valve of pipe will be affected by the reduction of wave height due to rebound. The failure of most electric ball valves is caused by the erosion of the external environment. Therefore, during the structural design of electric ball valves, it can be considered to isolate the contact between the external erosion medium and the pipe. For example, for non electric ball valves, a packing sealing device can be added between the outlet end ring and the outlet pipe. Its function is equivalent to that of the sleeve electric ball valve, which can not only resist the invasion of external corrosive media, but also add a safety barrier to the non electric ball valve. Even if the non electric ball valve is damaged, the electric ball valve can also play a compensating role and avoid pipe failure. In conclusion, the fatigue life of the rectangular non electric ball valve still depends on the compensation amount. The higher the fatigue life, the smaller the electric ball valve of the pipe will be, otherwise the opposite will happen.