Single orifice air release valve is an exhaust valve with only one orifice for inlet and exhaust valve ports.
There are two types of big mouth and small mouth. Large-mouth exhaust valve, suitable for exhausting air. When the main pipe is not pressurized, the float is located at the bottom of the valve, and the orifice is open. During the water filling process, the air is discharged and the rising water level supports the float ball to the valve seat hole, and then the water pressure in the pipe seals the valve outlet; when the drainage pressure in the pipe drops to near atmospheric pressure, the float ball falls and the air passes from the outside. To prevent vacuum inside the tube.
For small-port exhaust valves, the floating ball is usually close to the sealing surface of the small hole in the valve seat. When the accumulated water level in the valve cavity drops until the floating ball loses buoyancy and automatically leaves the sealing surface of the valve seat, the valve opens and the air in the valve automatically The small mouth is discharged, and as the water level rises, the float is floated and reseals. The small-port exhaust valve can eliminate the continuous escape of air from the water line.
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