Safety valve is an important safety accessory of pressure bearing special equipment

1、 Safety valve is an important safety accessory of pressure bearing special equipment. Safety valve is an automatic valve. It uses the force of the medium itself without any external force to discharge a rated amount of fluid to prevent the pressure from exceeding the rated safety value. When the pressure returns to normal, the valve will close and prevent the medium from flowing out. Safety valve is an important safety accessory of pressure bearing special equipment such as boiler, pressure vessel and pressure pipeline. It is a safety device set to prevent explosion caused by excessive pressure under abnormal conditions. It plays an important role in the safety and economy of the equipment.

Second, always keep the safety valve clean, prevent the valve body spring from being filled with oil dirt or corrosion, and prevent the discharge pipe of the safety valve from being blocked by oil or other foreign matters; Always check whether the lead seal is intact, prevent the weight of the lever safety valve from loosening or being moved, and prevent the adjusting screw of the spring safety valve from being screwed at will.

2: The safety valve shall be updated or overhauled in time when there are signs of leakage. It is forbidden to eliminate the leakage by increasing the load (such as over tightening the adjusting screw of the spring safety valve or hanging heavy objects on the lever of the lever safety valve). In order to prevent the valve disc and valve seat from being stuck by dirt such as oil dirt in the gas, so that the safety valve cannot be opened normally, the safety valve used for air, steam or other gases with viscous dirt that will not cause harm shall be subject to portable emission test regularly.

3: In order to keep the safety valve sensitive and reliable, regular calibration shall be conducted at least once a year. The contents of regular calibration generally include dynamic inspection and disassembly inspection. The main content of dynamic inspection is to check the opening pressure, reseating pressure, sealing degree and opening height under the rated discharge pressure of the safety valve. Its requirements are the same as those during the commissioning of the safety valve. If the dynamic inspection is unqualified, or there are abnormal conditions such as collapse and leakage during operation, the requirements are the same as those during safety valve commissioning. If the dynamic inspection is unqualified, or abnormal conditions such as leakage are found during operation, disassembly inspection shall be carried out. After disassembly, carefully check all parts of the safety valve for cracks, scars, wear, corrosion, deformation, etc., and repair or replace them according to the size and damage degree of the defect. Finally, assemble and conduct dynamic inspection.