1. Medium corrosion of electric control valve and internal leakage caused by aging of electric control valve
After a period of time after the adjustment of the electric regulator, due to the cavitation and flushing media of the valve, the wear of the valve core and seat, and the aging of the internal components, the electric control valve will not be closed tightly due to the large power regulatory agency. The leakage of the electric control valve will become more and more serious with the passage of time. Solution: readjust the actuator, maintain it regularly and calibrate it.
2. The selection error of electric control valve results in cavitation corrosion of valve and internal leakage of electric control valve
Cavitation and pressure difference: when the actual differential pressure valve δ P is greater than the critical pressure difference δ for cavitation, cavitation will occur. During cavitation process, the foam will burst and release huge energy. The valve seat and valve core will be damaged greatly. The cavitation operation under the conditions of throttle assembly, general valve and other conditions shall not exceed three months or even shorter, The valve is seriously corroded by cavitation, and the leakage of high valve seat can reach more than 30% of the rated flow, which is irreparable. Therefore, different electric valves have different specific technical requirements. It is very important to select a reasonable electric control valve according to the system process. Solution: process improvement, multi-stage pressure reducing or sleeve regulating valve can be selected.