1. Common types of safety valves include (1) Heavy hammer safety valve (2) Spring type safety valve (3) Pulse safety valve 2. According to structure, there are also types such as micro opening safety valves, full opening safety valves, fully closed safety valves, semi closed safety valves, and open safety valves. 3. According to the classification of the medium used, there are steam safety valves (usually represented by A48Y type), gas safety valves (usually represented by A42Y type), and liquid safety valves (usually represented by A41H type), etc. 4. According to nominal pressure classification, there are low-pressure safety valves (safety valves with nominal pressure ≤ PN16), medium pressure safety valves (safety valves with PN16425 ℃), etc. 6. According to the material classification of the sealing pair, there are metal to metal (hard seal), metal to non-metal (soft seal), etc. 7. Classified by opening height, there are micro opening safety valves (safety valves with an opening height within the diameter range of 1/40 to 1/20 of the flow channel), etc.

1. The main purpose of safety valves is to protect life, property and the environment. A safety valve is designed to open and release overpressure in a container or device, and to re-close and prevent further fluid release when it returns to its normal state. 2. A safety valve is a safety device that is in many cases the last line of defense. It is important to ensure that the safety valve can operate at all times and under all circumstances. Safety valves are not process valves or pressure regulators and should not be abused. It should be run for one purpose only: overvoltage protection.