Several problems should be paid attention to in the design of safety valve spring

Spring spring stiffness safety valve; pitch 1 in the pipeline system, in order to ensure its normal operation, there are safety valves. When designing the safety valve, it is necessary to ensure that the opening is flexible. Under the specified pressure, the rated displacement can be discharged. When it is discharged to the closing pressure, it is closed in time to ensure the sealing. In order to meet the above requirements, the design of the spring is crucial in the design of the spring safety valve.

2 Safety valve design The pressure flow characteristic of the safety valve is an important indicator of safety. The pressure flow characteristic curve can be used as the following type of liquid working force. He; factory 1 can be seen from the formula 1, the change of the spring installation of the high deer changes the power of the report. When the liquid is put and the left side of the liquid is increased, the greater the need, that is, the greater the spring stiffness, The pressure change corresponding to the fixed amount of liquid discharge is larger, the rigidity is small, the amount of pressure change is small, and the action of the valve is sensitive, which is beneficial to the normal operation of the system. In addition, the spring with small rigidity is advantageous for the processing and installation of the spring. Therefore, when the spring stiffness of the safety valve is small, it is advantageous for improving the performance of the valve.

When designing the spring of the safety valve, the spring stiffness should be considered first. For the safety valve spring in the general hydraulic pipeline, the stiffness value can be used for the next one. The manufacturer must be reliable. That is, after the safety valve is set, during operation, when the line pressure reaches the set pressure, the safety valve must be opened. There are many factors that affect the reliable operation of the safety valve. In terms of the spring, the safety valve spring operating point must be stabilized. If the spring pre-compression is easy to change, that is, the adjustment pressure screw is loose, which affects the normal opening of the valve; if the spring, the material heat treatment quality spring condition point selection is unreasonable, and the spring manufacturing quality is not good, the spring is bent, so that the spring and the valve body phase Factors such as bumping and jamming may cause the safety valve to work reliably; if the spring pitch is too small, and the pitch error spring during the manufacturing process may be partially closed during the compression process, the actual working number of the spring is reduced. The spring stiffness is increased, which causes the spring operating point to change, which affects the normal opening of the valve.

3 Conclusion In summary, in order to make the safety valve work properly, when designing the spring. The quality of the safety valve can be improved by reducing the spring stiffness, increasing the pitch, and improving the manufacturing quality of the spring.

The valve design is flawed. Shenyang Shenyang Valve Research Institute, 1976 Cheng Daxian, and so on. Mechanical design manual butterfly. Beijing Geological Industry Press

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