damper valve air

There is no connecting rod, bolt and other components in the part, so there will be no component problems in the process of use, so the failure rate is very low. Because there is a large gap between the butterfly plate and the valve body of the ventilation butterfly valve, there is enough expansion space, so in the process of use, it can effectively prevent the thermal expansion and cold contraction caused by the temperature change, and the butterfly plate will not be stuck