The electric butterfly valve with metal seal generally has a longer service life than the valve with elastic seal, but it cannot be completely sealed. If it is a soft seal, it can reach the standard of zero leakage. Of course, metal seals can operate at higher temperatures, while elastic seals cannot withstand high temperatures.

In addition to the different classifications, more attention should be paid to the selection. It can be selected according to the medium temperature. At normal temperature, the electric soft seal butterfly valve will be more suitable; When the temperature is higher than 150 °, the electric metal seal butterfly valve must be selected; If the on-off two position control is required, the midline sealed butterfly valve is more suitable; Under the condition of approximately equal percentage flow, the triple eccentric butterfly valve is more suitable for the working condition of interlocking regulation; As for corrosive media, it is natural to buy electric rubber lining or electric fluorine lining butterfly valve. There is another situation that needs to be explained, that is, the electric vacuum butterfly valve is the most suitable choice for the occasion that needs vacuum pumping.