A safety valve is a special valve in which the opening and closing parts are in a normally closed state under external force. When the pressure of the medium in the equipment or pipeline increases beyond the specified value, the medium is discharged outside the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value.

Safety valves belong to the category of automatic valves, mainly used in boilers, pressure vessels, and pipelines. They control the pressure to not exceed the specified value and play an important protective role in personal safety and equipment operation. The safety valve can only be used after pressure testing.

Safety valves are a relatively special branch of the valve family, and their uniqueness lies in the fact that unlike other valves, they only serve as switches, and more importantly, they protect the safety of equipment. With the rapid development of China's economic construction, there are more and more equipment projects under pressure control. Given the need for equipment pressure relief, safety valves play a crucial role in protecting the equipment. As of 2013, there were over 700 manufacturers and traders of various types of safety valves, with daily transaction inquiries reaching over 200. The supply and demand market for safety valves has significantly increased.

Through preliminary analysis of the first quarter data, the demand for safety valves is expected to be 20 percentage points higher. Safety valves are important safety accessories on boilers, pressure vessels, and other pressurized equipment. A safety valve (also known as a relief valve) automatically opens and closes according to the working pressure (working temperature) of the pressure system, and is generally installed on equipment or pipelines in a closed system to protect system safety.

When the pressure or temperature inside the equipment or pipeline exceeds the set pressure of the safety valve, it automatically opens for pressure relief or cooling, ensuring that the pressure (temperature) of the medium inside the equipment and pipeline is below the set pressure (temperature), protecting the normal operation of the equipment and pipeline, preventing accidents and reducing losses.

Safety valves are mainly widely used in steam boilers, liquefied petroleum gas tank cars or liquefied petroleum gas railway tank cars, oil wells, high-pressure bypasses of steam power generation equipment, pressure pipelines, pressure vessels, etc. Safety valves are generally divided into spring type safety valves, lever type safety valves, and pulse type safety valves according to their structural forms, with spring type safety valves being widely used; According to the connection method, it is divided into threaded safety valves and flange safety valves.