4. Flash evaporation and cavitation of control valve The liquid flowing in the control valve often appears flash evaporation and cavitation. Their occurrence will not only affect the selection and calculation of caliber, but also lead to serious noise, vibration, material damage, etc. In this case, the working life of the regulating valve will be greatly shortened, which is necessary to elaborate. Under normal circumstances, as a medium in liquid state, it keeps liquid when flowing into, through and out of the control valve. The pressure change curve is shown in (1) of Figure 7.

The electric butterfly valve is subject to major inspection every seven days and minor inspection every three days. Because the junction of electric butterfly valve has a unique form, and the operating environment is also different, what are the main aspects we should check when we check the electric butterfly valve? Technicians must understand the working condition of the electric butterfly valve, check the corrosion of the medium in the electric butterfly valve, check the noise interference of the electric butterfly valve, and check whether the electric butterfly valve leaks, Moreover, the electric butterfly valve must be cleaned daily to ensure the sealing performance of the electric butterfly valve.