The surplus air in a very pipe can impede the fluid move. So, the air in pipe induce slower move, turbulence, and corrosion. To stay away from all theses complications air valve is equipped in the pipe to vent the excess air. The actuator is what supplies the demanded power https://automotiveindustry56458.getblogs.net/59677254/top-latest-five-types-of-air-valves-urban-news