Safety valve knowledge: analyze common faults of boiler safety valve (I)
Safety valve knowledge: analyze common faults of boiler safety valve (I)
1. Preamble
The safety valve is a very important valve for protection, widely used in various pressure vessels and pipe systems. When the pressure in the pressure system exceeds the specified value, it can be automatically opened to discharge the excess medium to the atmosphere, so as to ensure the safe operation of the pressure vessel and pipe system and prevent accidents. When the pressure in the system returns to the working pressure or is slightly lower than the working pressure, it can be automatically closed. Whether the safety valve works reliably is directly related to the safety of equipment and personnel, so attention must be paid. The main safety valve product names of China Safety Valve Network include：Safety Valve,Spring Type,Bellows,High Temperature and Pressure,Main Safety Valve,Pulse Safety Valve,Low Lift,Full Lift
2. Cause Analysis and Solutions for Common Failures of Safety Valve
Leakage of safety valve
Under the normal working pressure of equipment, the leakage at the sealing surface of valve clack and valve seat exceeds the allowable level, and the leakage of safety valve will not only cause the loss of medium. In addition, the continuous leakage of the medium will damage the hard sealing material. However, the sealing surface of the commonly used safety valve is made of metal material to metal material. Although it is required to be smooth and flat, it is also very difficult to achieve absolutely no leakage under the pressure of the medium. Therefore, for the safety valve with working medium of steam, if there is no visible and audible leakage at the outlet end under the specified pressure value, the sealing performance is considered as qualified.
