Safety valve installation and maintenance and precautions
日期：2022-04-14 Click：164
The safety valve is a safety protection valve. Its opening and closing parts are in a normally closed state under the action of external force. When the pressure of the medium in the equipment or pipeline rises and exceeds the specified value, it automatically opens. The pressure of the medium in the pipeline or equipment exceeds the specified value.
Safety valves are used in 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 opening height of the safety valve disc, 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 (small discharge throat diameter); the full-opening safety valve is safe to open. The valve opening height is 0.25d0 (small discharge throat diameter). According to the structure, the safety valve can be divided into vertical hammer type, lever type, spring type and pilot type (pulse type); according to the structure of the valve body, it can be divided into closed type and non-closed type. The closed safety valve means that the excluded medium does not leak out, and all of it is discharged along the outlet to the designated location. It is generally used in toxic and corrosive media.
For air and steam safety valves, non-closed safety valves are often used. The selection of safety valve products should be determined according to the actual sealing pressure. For spring-type safety valves, within a nominal pressure (PN) range, there are springs with several working pressure levels. When ordering, in addition to indicating the safety valve model, name medium and temperature, the valve body sealing pressure should also be indicated. Otherwise, it is supplied with the maximum sealing pressure.
The installation and maintenance of safety valves should pay attention to the following matters: All safety valves should be installed vertically. There should be no resistance at the outlet of the safety valve to avoid pressure. The safety valve should be specially tested before installation, and its official tightness should be checked. Periodic inspections should be made for those in use.
For air and steam safety valves, non-closed safety valves are often used. The selection of safety valve products should be determined according to the actual sealing pressure. For spring-type safety valves, within a nominal pressure (PN) range, there are springs with several working pressure levels. When ordering, in addition to indicating the safety valve model, name medium and temperature, the valve body sealing pressure should also be indicated. Otherwise, it is supplied with the maximum sealing pressure.
The installation and maintenance of safety valves should pay attention to the following matters: All safety valves should be installed vertically. There should be no resistance at the outlet of the safety valve to avoid pressure. The safety valve should be specially tested before installation, and its official tightness should be checked. Periodic inspections should be made for those in use.