What is the difference between air valve and air relief valve?

Air valves and air release valves each have their own unique uses and usage environments. Air valves is designed to prevent negative pressure in the pipeline and regulate airflow; Air relief valve is designed to discharge excess gas and cut off the flow of the medium. Therefore, the selection should be based on actual needs.

Air valve:
Air valve is a valve that controls airflow, commonly found in pneumatic systems, air compressors, gas tanks and other equipment. Its main functions include flow control, air pressure regulation and backflow protection. The control method can be manual or automatic.
Air release valves:
Air release valves is often used in drainage pipes, water supply systems, heating systems and automobile brake systems. Its main function is to remove gas from the system to prevent pipe bubbles from blocking or affecting system operation.

Function and effect:

Air valve: mainly used to prevent the transient process decompression wave from generating negative pressure in the pipe. It is usually installed at the high point where the dynamic water pressure is low during normal operation of the pipeline and liquid column separation may occur during transient flow. When the pressure in the pipeline is lower than the atmospheric pressure, air is sucked in, and when the pressure in the pipeline rises above the atmospheric pressure, the air is discharged. In addition, the air valve also has multiple functions such as controlling gas flow, preventing backflow, regulating gas pressure, automatic control, energy saving and environmental protection, and is widely used in various industrial fields and life scenarios.
Air release valve: mainly used to discharge excess gas in the pipeline, especially to cut off the flow direction of the medium during pipeline maintenance and transformation. Exhaust valves can be divided into various types according to their functions, such as cut-off type, regulating type, safety pressure relief, self-balancing type, etc., to meet the needs of different occasions.

Application scenarios:
Air valve: widely used in various pipeline systems, especially in scenarios where negative pressure needs to be prevented in the pipeline. At the same time, it is also used to control and regulate gas flow to meet the needs of different production processes and life.
Air release valve: usually installed at the highest and lowest points of the pressure pipeline system to cut off the flow direction of the medium during pipeline maintenance and transformation. In addition, exhaust valves are also used in various industrial equipment and systems, such as oil field water injection, sewage treatment plants, water plants, etc.

The air valve is mainly used to control the flow and pressure of gas, while the air release valve is mainly used to remove gas from the liquid system to ensure the normal operation of the system. Although both of them involve gas treatment, they are different in function and application scenarios.