5. How to install and maintain safety valves

A safety valve is a type of valve used for safety protection. Its opening and closing components are in a normally closed state under external force. When the pressure of the medium inside the equipment or pipeline increases and exceeds the specified value, it automatically opens to prevent the pressure of the medium inside the pipeline or equipment from exceeding the specified value by discharging the medium outside the system. Safety valves belong to the category of automatic valves, mainly used in boilers, pressure vessels, and pipelines to control pressure not exceeding the specified value, playing an important protective role in personal safety and equipment operation.  The main safety valve product names of China Safety Valve Network include:Hydraulic Safety Valve,Impulse Safety Valve,Impulse Spring Safety Valve,JIS Safety Valve,Main Safety Valve,Overflow ValveOil Refining Specific Safety Valve,Pulse Safety Valve,Pilot Safety Valve

According to the opening height of the safety valve disc, it can be divided into micro opening safety valves and full opening safety valves. The opening stroke height of micro opening safety valves is ≤ 0.05d0 (minimum discharge throat diameter); The opening height of the fully open safety valve is ≤ 0.25d0 (minimum discharge throat diameter).  

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.