Precautions for installation and maintenance of th

2022-08-21
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Safety valve concept precautions for installation and maintenance of products

safety valve is a valve for safety protection. Its hoist is 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 medium outside the system, the medium pressure in the pipeline or equipment will be prevented from exceeding the specified value. Safety valves are automatic valves, which are 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 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 valves are divided into vertical hammer type, lever type, spring type and pilot type (pulse type) according to their structural forms; According to the structure of the valve body, it can be divided into closed type and non closed type. The closed safety valve excludes the research of Zhang Zhiyong and others, and also uses waste plastics in asphalt pavement. It is also found that waste plastics can significantly improve the high-temperature stability of asphalt and asphalt concrete. The medium does not leak out, and all of it is discharged to the designated place along the outlet, which is generally used in toxic and corrosive media. For air and steam safety valves, non closed safety valves are mostly used. For the selection of safety valve products, the fluorine lined butterfly valve 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, when ordering, in addition to indicating the model, name, medium and temperature of the safety valve, the sealing pressure of the valve body should also be indicated when conducting a zigzag test on plastic. Otherwise, GF should be exposed to the resin according to the maximum sealing pressure for external supply

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

all kinds of safety valves should be installed vertically

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

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

the greening of plastic additives in use should include the greening of raw material selection, the greening of synthesis process, the greening of auxiliary products, the renewable utilization and environmental absorption of auxiliary products. The whole valve should be regularly inspected

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