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Classification and usage precautions of safety valves
According to their structural form, safety valves can be divided into hammer type, lever type, spring type, and pilot type (pulse type); According to the structure of the valve body, it can be divided into two types: closed and non closed. A closed safety valve means that the discharged medium does not leak out and is completely discharged along the outlet to a 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 based on the actual sealing pressure. For spring type safety valves with several working pressure levels within a nominal pressure (PN) range, in addition to specifying the safety valve model, name, medium, and temperature, the valve body sealing pressure should also be indicated when ordering. Otherwise, the maximum sealing pressure should be supplied.
The installation and maintenance of safety valves should pay attention to the following matters:
All types of safety valves should be installed vertically.
The outlet of the safety valve should be unobstructed to avoid pressure.
Before installation, safety valves should be specifically tested and their sealing properties checked.
Regular inspections should be conducted on safety valves in use.
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