The safety valve is an overpressure protection device. When the pressure in the equipment, container or pipeline exceeds the allowable value, the valve will automatically open and then discharge completely to prevent the pressure in the equipment, container or pipeline from rising; when the pressure drops to the specified At the time of the value, the valve will automatically close in time to protect the safe operation of equipment, containers or pipes.
At present, safety valves are mainly used in boilers, pressure vessels and pipelines. They play an important role in protecting personal safety and equipment operation, and are widely used in pharmaceutical and other industries. It is understood that since 2013, the market size of China's safety valve industry has gradually expanded, and the number of enterprises with qualified production safety valves has also begun to increase, and the share of imported valves in the domestic market has gradually declined. Domestic valves have gradually emerged, and the total Looking at the future development of domestic safety valves is very broad.
For the user, choosing the safety valve produced by the regular manufacturer, correct installation, and reasonable operation are the prerequisites for ensuring stable operation. However, during the use of the safety valve, there is often a problem of jumping and leaking, so how should the cause be found? And solve it? The industry has given three directions for reference in the industry.
First, there is a leak in the safety valve. The industry said that when a small leak occurs in the safety valve, it is generally not easy to find, but even a small leak point will expand in the middle of erosion, in the face of the situation, the user needs to check the safety valve.
The test method is to cover the sealing surface of the sealed sealing surface test when the pressure is tested, and observe whether the pressure has foam after the pressure. According to the industry, “The safety valve program stipulates that the soft seal must be bubble-free. A hard seal may be available, but the bubble generation rate must be within a certain range. This should be done after the calibration is completed because the safety valve may be in the calibration process. Will destroy the sealing surface."
Second, the spring produces fatigue. It is understood that the spring is affected by temperature and environment (if the safety valve is closed, the influence of the medium is also considered). If this reason, it is necessary to consider the safety valve selection or quality problem. This also requires the user to consider whether the selection of the safety valve is reasonable and the quality is checked when selecting the safety valve.
Third, the pipeline factor. For example, vibration and shock cause the safety valve to be set too high, and the valve core is separated from the valve seat sealing surface, causing damage and slag inclusion.
According to the industry, in fact, the safety valve manufacturing requirements are quite high, because the sealing force of the safety valve is equal to the spring force - medium pressure, and the general place such as the main steam of the power plant, the feed water pressure and the working pressure safety valve, so the actual seal The sealing force of the surface is not too large, and a good seal is expected under the action of low. The sealing surface has high processing precision and the material has high requirements.
Fourth, the performance of the spring is unstable. The industry believes that the spring performance of the safety valve must be very stable, because the higher temperature of the medium will cause the output of the spring to drop, which will result in a tight seal. In particular, steam safety valves have a recoil plate, and a general leak may cause the safety valve to jump, thereby affecting the power supply.
In addition, the industry does not recommend self-maintenance. Safety valves are important components to ensure the safe operation of equipment. Only qualified inspection units can inspect and maintain safety valves. It is recommended to disassemble once a year and submit for inspection.
At present, safety valves are mainly used in boilers, pressure vessels and pipelines. They play an important role in protecting personal safety and equipment operation, and are widely used in pharmaceutical and other industries. It is understood that since 2013, the market size of China's safety valve industry has gradually expanded, and the number of enterprises with qualified production safety valves has also begun to increase, and the share of imported valves in the domestic market has gradually declined. Domestic valves have gradually emerged, and the total Looking at the future development of domestic safety valves is very broad.
For the user, choosing the safety valve produced by the regular manufacturer, correct installation, and reasonable operation are the prerequisites for ensuring stable operation. However, during the use of the safety valve, there is often a problem of jumping and leaking, so how should the cause be found? And solve it? The industry has given three directions for reference in the industry.
First, there is a leak in the safety valve. The industry said that when a small leak occurs in the safety valve, it is generally not easy to find, but even a small leak point will expand in the middle of erosion, in the face of the situation, the user needs to check the safety valve.
The test method is to cover the sealing surface of the sealed sealing surface test when the pressure is tested, and observe whether the pressure has foam after the pressure. According to the industry, “The safety valve program stipulates that the soft seal must be bubble-free. A hard seal may be available, but the bubble generation rate must be within a certain range. This should be done after the calibration is completed because the safety valve may be in the calibration process. Will destroy the sealing surface."
Second, the spring produces fatigue. It is understood that the spring is affected by temperature and environment (if the safety valve is closed, the influence of the medium is also considered). If this reason, it is necessary to consider the safety valve selection or quality problem. This also requires the user to consider whether the selection of the safety valve is reasonable and the quality is checked when selecting the safety valve.
Third, the pipeline factor. For example, vibration and shock cause the safety valve to be set too high, and the valve core is separated from the valve seat sealing surface, causing damage and slag inclusion.
According to the industry, in fact, the safety valve manufacturing requirements are quite high, because the sealing force of the safety valve is equal to the spring force - medium pressure, and the general place such as the main steam of the power plant, the feed water pressure and the working pressure safety valve, so the actual seal The sealing force of the surface is not too large, and a good seal is expected under the action of low. The sealing surface has high processing precision and the material has high requirements.
Fourth, the performance of the spring is unstable. The industry believes that the spring performance of the safety valve must be very stable, because the higher temperature of the medium will cause the output of the spring to drop, which will result in a tight seal. In particular, steam safety valves have a recoil plate, and a general leak may cause the safety valve to jump, thereby affecting the power supply.
In addition, the industry does not recommend self-maintenance. Safety valves are important components to ensure the safe operation of equipment. Only qualified inspection units can inspect and maintain safety valves. It is recommended to disassemble once a year and submit for inspection.
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