What are the types of air vent valves?

2025-03-10

The air vent valve is used for air venting in pipelines of independent heating systems, central heating systems, heating boilers, central air conditioning, floor heating, and solar heating systems. Water usually contains some dissolved air, and the solubility of air decreases as the temperature rises. As water circulates, the gas gradually separates from the water and forms large bubbles or even gas columns. Since water is constantly replenished, gas is continually generated.

The air vent valve mainly has the following seven types:

1.Single Port Air Vent Valve: It serves as the exhaust for the pipeline to prevent air lock or gas resistance. For example, when a water pump stops due to a power failure, negative pressure may occur in the pipe, and the valve automatically lets in air to protect the pipeline.

2.Quick Ventilation Valve: This is used at the highest point or air lock locations in the pipeline to discharge gas, clear the pipeline, and ensure that the pipeline operates normally, with the water flow meeting design requirements. Without this valve, gas buildup may cause air resistance, reducing the water flow below design specifications.

3.Compound Air Vent Valve: When water enters the pipeline, the sealing head is positioned at the bottom of the guide frame, allowing significant air release. Once the air is expelled, the water enters the valve, lifting the float ball and driving the sealing head to close, stopping the air discharge. During normal operation, if small amounts of gas accumulate in the upper part of the pipeline, when the water level in the valve drops, the float ball lowers, and the gas is discharged through a small hole.

4.Quick Vent (Suction) Valve: In the operation of the pipeline, the float ball remains at the bottom of the float chamber to release a large amount of air. Once the air is removed, water enters the valve, flows through the float chamber, and moves the float ball to close the valve. During normal operation, if small amounts of gas accumulate in the upper part of the valve, when the water level drops, the float ball lowers, and the gas is discharged through a small hole.

5.Sewage Compound Air Vent Valve: This is used at the highest points or air lock locations in sewage pipelines. It removes gas from the pipeline to clear it, ensuring normal operation.

6.Micro Air Vent Valve: During the main water transport process, air continuously releases from the water and collects at the high points of the pipeline, forming air pockets that make water transport difficult. The system's water transport capacity can decrease by about 5-15% due to this.

7.Dual Port Quick Air Vent Valve: To release gas from the pipeline, rotate the valve stem counterclockwise, causing the valve stem and valve to rise. Under the pressure of water, the air in the pipeline enters the cavity and is vented through the air vent. The water then fills the cavity, causing the float ball to rise and seal the vent. During normal operation, air in the water continues to flow into the upper part of the valve cavity under pressure, pushing the float ball down and opening the vent again. The float ball then returns to its original position, sealing the vent.

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