QB2 stainless steel automatic air vent valve  Working principle:

When the gas in the pipeline needs to be discharged, the QB2 stainless steel automatic air vent valve stem should be rotated counterclockwise, so that the valve stem and valve rise, so that the air in the pipeline under the action of water pressure into the body cavity, and discharged from the exhaust nozzle, then the water in the pipeline filled with the body cavity, so that the floating ball under the action of water buoyancy, move upward to plug the exhaust nozzle, achieve self-sealing, the pipeline in the normal line, Under the action of pressure, the air in the water is discharged into the upper part of the body cavity of the exhaust valve, forcing the float down and leaving the original sealing position. At this time, the air is discharged from the exhaust nozzle, and then the float returns to the original position and self-sealing. Therefore, QB2 stainless steel automatic air vent valve is always open in the normal operation of the exhaust valve, the float constantly repeats the above action, and the air is discharged continuously. When the body cavity needs to be repaired or cleaned, the valve should be closed. The exhaust valve is closed when the stem is rotated clockwise.