Safety valve action is directly related to the reliability of the equipments and personal safety. And according to the protected equipment working conditions correctly choose safety valve, so as to guarantee the normal work of the safety valve, safety protective even concern whether the prerequisites.
Choose safety valve problems involving two aspects: on the one hand, working condition of equipment or system is to be protected, such as working pressure allows the overpressure limits, to prevent overpressure of emissions, the temperature of the working medium, etc. On the other hand is the action of safety valve itself characteristics and parameters.
The following points from three angles to introduce for you to choose:
Nominal pressure of the test pressure and maximum working pressure under operating temperature at all levels, under the same nominal pressure, when the temperature increase, the maximum working pressure is reduced. When choosing the relief valve, the valve should be according to the material, the working temperature and maximum working pressure, according to the above heating decompression table to determine the nominal pressure of the valve.
Determine the working pressure level of the relief valve opening pressure can be adjusted by changing the amount of compression spring preload. But every spring only within a certain range of the opening pressure of work, is beyond the scope of the other in the spring. In this way, the same kg pressure valve is adjusted by the opening pressure of the spring design within the scope of work, is beyond the scope of the other in the spring. In this way, the same nominal pressure of the valve is adjusted by the opening pressure of the spring design scope is divided into different working pressure level.
Size selection of safety valve size should be based on emissions must be to determine. Is to make the rated capacity of safety valve used is greater than and as close as possible to the displacement. When abnormal overpressure occurs, prevent excessive overpressure must emissions, by the system or equipment working conditions, and the causes of overpressure factors such as the decision.
