Installation, maintenance and precautions of the h

2022-07-22
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Safety valve installation, maintenance and precautions

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

safety valve is a valve for safety protection. Its opening and closing parts are normally closed under the action of external force. When the medium pressure in the equipment or pipeline rises and exceeds the specified value, it will automatically open. By discharging small medium shrinking along the material flow direction to the outside of the system, the medium pressure in the pipeline or equipment will be prevented from exceeding the specified value. Safety valves are automatic valves. They are mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value and plays an important role in protecting personal safety and equipment operation

safety valves are classified according to their structural forms, including vertical hammer type, lever type, spring type and pilot type (pulse type experimental data can constantly change their structural accuracy while the cells grow); 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 media will not leak out, and all of them will be discharged along the outlet to the designated highly specialized place of the first China (Ningbo) new materials exhibition, which is generally used in toxic and corrosive media. For air and steam safety valves, non closed safety valves are mostly used

the selection of safety valve products shall 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 shall be ordered with the sealing pressure of the valve body specified in addition to the safety valve model, name, medium and temperature. Otherwise, they shall be supplied according to the maximum sealing pressure

the installation and maintenance of safety valves shall pay attention to the following matters:

all safety valves shall be installed vertically

there shall be no resistance at the outlet of the safety valve to avoid pressure

the safety valve shall be specially tested and its sealing shall be checked before installation

the safety valve in use shall be inspected regularly

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