Precautions for installation and maintenance of th

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Precautions for installation and maintenance of safety valve

safety valve is a valve for safety protection. Its hoist is in a normally closed state 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. The medium pressure in the pipeline or equipment will be prevented from exceeding the specified value by discharging the medium outside the system. 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

for outdoor lines, 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 the 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. Closed safety valve means that the excluded medium will not leak out, and all of it will be discharged to the designated place along the outlet. It is generally used in toxic and corrosive media. Then we should replace the safety valves for air and steam in time, and use non closed safety valves more. The selection of safety valve products should be determined according to the actual sealing pressure. For spring-loaded safety valves, within the range of a nominal pressure (PN), the preparation of several industrial cellulose plastics is to use natural high molecular compounds such as cellulose or cellulose derivatives in the above plants as pressure grade springs. When ordering, in addition to indicating the model, name, medium and temperature of the safety valve, it should also indicate the sealing pressure of the valve body, otherwise it should be supplied according to the maximum sealing pressure

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 safety valve in use should be checked regularly

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