Operation method of exhaust valve

When water is injected into the pipe, the plug stays in the open position for a large amount of exhaust. When the air is completely discharged, water accumulates in the valve, and the float is lifted. The plug is driven to the closed position to stop a large amount of exhaust. When the water in the pipe is transported normally, if a small amount of air accumulates in the valve to a considerable extent, the water level in the valve drops, and the float decreases accordingly. At this time, the air is discharged through the small hole. When the water pump stops, the water flow in the pipe is empty, or when negative pressure is generated in the pipe, the plug quickly opens and sucks in air to ensure the pipeline is complete.