Composite Air Release Valve, Ductile/Cast Iron, DN25-DN200

Product Name: Composite Air Release Valve
Body Material: Ductile Iron, Cast Iron
Size Range: DN25-DN200, 1-8 Inch
Pressure: PN10, PN16, Class 150 LB
End Connection: Flanged
Medium: Water

Composite Air Release Valve

Used at the highest point or closed areas of a pipeline to expel the air within the pipe, thus ensuring normal operation. If an air release valve is not installed, the movement of the liquid within the pipe generates heat and causes gas, forming a short circuit, which prevents the pipe from discharging water to the required capacity. Additionally, when the pipeline operates with power outages or pump stoppages, negative pressure occurs in the pipeline, which can cause pipeline vibration or rupture. The air release (absorption) valve quickly draws air into the pipe to prevent pipeline vibration or rupture.

Principle of Operation of the Composite Air Release Valve

When water starts to flow into the pipe, the valve remains in the open position to release a large amount of air. When the air is fully released, the water level rises inside the valve, causing the float ball to rise, which in turn moves the valve head to the closed position, stopping the large amount of air release. When water is normally transported within the pipe, if a small amount of air accumulates to a certain level within the valve, the water level inside the valve drops, and the float ball descends, allowing the air to be expelled through a small hole. When the water pumping stops, and the water flow within the pipe is empty, or when negative pressure occurs within the pipe, the valve head opens to draw in air to ensure the safety of the pipeline.

Main Component Materials

Main Connection Dimensions (Unit: mm)