The function of the safety valve is to prevent the pressure of the medium in the pipeline or the device from exceeding the specified value, so as to achieve the purpose of safety protection.
The safety valve is a safety protection valve, and its opening and closing member is normally closed under the action of external force. When the pressure of the medium in the equipment or pipeline rises, it automatically opens when the value exceeds the specified value, and is prevented by discharging the medium outside the system. The pressure of the medium in the pipe or equipment exceeds the specified value. Safety valves are automatic valves, mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation.
According to the safety valve flap opening height, it can be divided into micro-opening safety valve and full-opening safety valve. The opening stroke height of the micro-opening safety valve is: ≤0.05d0 (zui small discharge throat diameter); full-open safety valve The opening height is ≤ 0.25d0 (zui small discharge throat diameter).
Safety valves are divided according to the structure, and are divided into vertical hammer type, lever type, spring type and pilot type (pulse type); according to the structure of the valve body, they can be divided into closed type and non-closed type. Enclosed safety valves, ie, excluded media, are not leaked and are all discharged along the outlet to a designated location, typically used in toxic and corrosive media. For safety valves for air and steam, non-closed safety valves are often used. The selection of safety valve products should be determined according to the actual sealing pressure. For spring-loaded safety valves, springs with several working pressure levels within a nominal pressure (PN) range, in addition to the safety valve type, name, medium and temperature, the valve body sealing pressure should be noted. Otherwise, it is supplied according to the large sealing pressure of zui.
Safety valve installation and maintenance should pay attention to the following:
1. All safety valves should be installed vertically.
2. There should be no resistance at the exit of the safety valve to avoid pressure.
3. The safety valve should be specially tested before installation and check its official seal.
4. Regular inspection of the safety valve in use
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