Safety valves are used as safety protection devices on equipment, devices and pipelines. Leakage is a common fault that seriously threatens the safe operation of production and construction. The specific analysis of safety valve leakage is as follows:
First, the cause of leakage 1. Oxidation scale, scale, debris, etc. fall on the sealing surface between the valve flap and the valve seat;
2. Mechanical damage or corrosion of the sealing surface;
3. The valve stem is bent and deformed, or the lever of the lever type safety valve is deflected from the fulcrum to displace the valve core and the valve disc;
4. The spring fails due to excessive load, or the spring is weakened due to corrosion.
5. Improper installation;
6. High temperature causes leakage.
Second, the treatment method 1. Use manual exhaust purge, or disassemble to clean and reassemble, or replace and then check;
2. It should be repaired by grinding or turning according to the degree of damage;
3. Replace the spring and re-adjust the opening pressure;
4. Re-assemble or replace the valve stem and remove the additional load from the pipe before re-calibration;
5. If it is improperly selected, the safety valve suitable for high temperature medium (such as safety valve with radiator or other special safety valve for special bead) should be re-selected according to the temperature of use;
6. Appropriate thermal insulation measures should be taken due to leakage caused by high temperature environment;
7. Correct the lever centerline.
Third, preventive measures 1. During the overhaul, thoroughly check or replace the safety valve components;
2. Accurate testing of valve maintenance and operation.
First, the cause of leakage 1. Oxidation scale, scale, debris, etc. fall on the sealing surface between the valve flap and the valve seat;
2. Mechanical damage or corrosion of the sealing surface;
3. The valve stem is bent and deformed, or the lever of the lever type safety valve is deflected from the fulcrum to displace the valve core and the valve disc;
4. The spring fails due to excessive load, or the spring is weakened due to corrosion.
5. Improper installation;
6. High temperature causes leakage.
Second, the treatment method 1. Use manual exhaust purge, or disassemble to clean and reassemble, or replace and then check;
2. It should be repaired by grinding or turning according to the degree of damage;
3. Replace the spring and re-adjust the opening pressure;
4. Re-assemble or replace the valve stem and remove the additional load from the pipe before re-calibration;
5. If it is improperly selected, the safety valve suitable for high temperature medium (such as safety valve with radiator or other special safety valve for special bead) should be re-selected according to the temperature of use;
6. Appropriate thermal insulation measures should be taken due to leakage caused by high temperature environment;
7. Correct the lever centerline.
Third, preventive measures 1. During the overhaul, thoroughly check or replace the safety valve components;
2. Accurate testing of valve maintenance and operation.
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