How can air and/or vacuum from forming in water delivery systems be avoided? An air valve, a particular hydromechanical flow control device that enables metered fluid flow in one or both directions, might be a solution. During the filling, draining, or operating of liquid pipeline systems, the role of a pipeline is to release stored gases or allow air into the pipeline.
It’s critical to select the best site for an air valve installation. The air valves are strategically positioned throughout the pipeline’s course to achieve optimal efficiency. Air valves are necessary at the following locations for effective aeration and ventilation of water and wastewater systems:
- Maximum High Points:
Air bubbles collect and create air pockets, which become trapped at the system’s highest points. Air valves are placed here to assist ventilate the air pockets to the environment.
- Temporary High Points:
Localised high peaks can also act as a catchment area for air bubbles. The bubbles are vented to the environment through an air valve here.
- Long Rising or Falling Pipe Sections
Air pockets that have become dislodged might travel downstream and generate bigger air pockets at the pipe’s top. A vacuum can also be created by fast flow in downward sloping pipe portions. To effectively vent and pull air into the system, air release valves and air vacuum valves should be fitted every 800m on lengthy pipe lengths as a rule of thumb.
- After Fast Closing Valves
Due to the force of the flow, vacuums can occur downstream from valves that are rapidly cut off. Negative pressure must be eased by introducing air into the pipe in order for the pipe to work properly.
- After Flow Throttling / Boosting Devices
The pressure and velocity disparities after flow-restricting devices such as turbines or control valves can lead to the production of a vacuum. To pull air into the system, air vacuum valves must be placed near these devices. Air bubbles are drawn into the flow by flow boosting devices such as pumps and shortened pipe sections. To vent these air pockets, air release valves must be fitted after these devices.
Finally, make sure your air valves are in easily accessible, well-ventilated areas. This guarantees that they have adequate air to pull into the systems at all times and that the air that is evacuated has a way out. It’s also easier to get to the valves for maintenance.
We learnt from this article that air may build up in water mains and represent a serious hazard to the entire system.
Planned to install some valves? Look no further than the air vent valve for more valve-related products
