Water hammer-proof air valve and water hammer-proof exhaust method for in-use pipeline

A water hammer-proof air valve, comprising a valve body and a bonnet,

• the valve body fixedly connected with the bonnet,
• a valve opening, for being communicated with a pipeline provided on the valve body,
• an intake and exhaust device disposed in an inner cavity of the valve body, for discharging a gas retained in the pipeline to an outside as the pipeline is filled with water and closing a valve after the pipeline is filled with water, the intake and exhaust device comprises:
• a casing fixedly connected to the bonnet and/or the valve body, a floating ball located in an inner cavity of the casing, and a sliding mass capping the floating ball and capable of sliding up and down along an inner wall of the casing to open or close the valve,
• a bonnet opening provided on the bonnet,
• an output end of the intake and exhaust device penetrating the bonnet opening and communicated with an exhaust throttling device, for limiting an exhaust amount of gas of the intake and exhaust device, wherein the exhaust throttling device comprises a throttle tube,
• an output end of the exhaust throttling device communicated with outside air, and
• an exhaust device, for discharging the gas separated out from the pipeline to the outside through the exhaust throttling device after the intake and exhaust device closes the valve, disposed in the intake and exhaust device, wherein the exhaust device comprises an aperture,
• wherein a sealing ring is located between the bonnet and the valve body, and the sealing ring seals against all of the valve body, the bonnet, the casing and the sliding mass.