Safety valve is an important safety accessory of special equipment, and its installation also has corresponding requirements. Safety valve is a special branch of the valve family. Its particularity is that the safety valve only plays the role of opening and closing, and more importantly, plays the role of protecting the safety of equipment. Safety valve is a special valve that the opening and closing parts are normally closed under the action of external force. When the medium pressure in the equipment or pipeline increases beyond the specified value, the medium pressure in the pipeline or equipment is prevented from exceeding the specified value by discharging the medium outside the system. Safety valve belongs to automatic valve category, which is mainly used in boiler, pressure vessel and pipeline. The control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation. It must be noted that the safety valve can only be used after pressure test.
In recent years, there have been many boiler explosions in China, most of which are undoubtedly caused by improper use of safety valves or lack of maintenance. Once the accident happened, Chengdu caused huge economic losses. With the rapid development of China's economic construction, there are more and more equipment projects with pressure control. In view of the need of equipment pressure relief, safety valve plays an important role in the process of equipment protection. Valve industry plays a very important role in the development of national economy as an important link in the preparation of manufacturing industry. Due to the gap between the domestic valve manufacturing industry and the international advanced level, many key valves with high parameters, high temperature, high pressure and high pound level have been imported. In order to promote the localization of valves, after the opinions on accelerating the revitalization of the equipment manufacturing industry issued by the State Council, the relevant departments of the state made the requirements for the localization of major equipment according to the requirements of the state , successively made a series of major deployments, led by the national development and Reform Commission, China Machinery Industry Federation and China General Machinery Industry Association, deployed and formulated the valve localization scheme for major equipment in related fields, and coordinated with relevant departments for many times. Now, the valve localization has formed a consensus in the domestic valve industry. Therefore, the correct use of the safety valve, so that the safety valve to give full play to its role. It not only benefits the country and the people, but also promotes the economic construction.
The safety valve plays a safety protection role in the system. When the system pressure exceeds the specified value, the safety valve will be opened to discharge part of the gas / fluid in the system out of the atmosphere / pipeline, so that the system pressure does not exceed the allowable value, so as to ensure that the system will not have an accident due to the high pressure. The function of the safety valve is overpressure protection. So the importance of the safety valve is very obvious, but how to use the safety valve correctly and maintain the safety valve is also very important, otherwise, it can not achieve the effect of making the best use of everything.