Air / Vacuum relief
Vacuum relief is a mechanism used in various systems, including irrigation systems, to prevent damage caused by a vacuum or negative pressure in the system.
In an irrigation system, vacuum relief valves are typically installed on the main water supply line or on individual zone valves to regulate the pressure and prevent damage to the pipes, valves, and sprinklers.
Vacuum relief valves are an important safety feature in irrigation systems, as they can prevent costly repairs and water waste.
In addition to vacuum relief valves, other measures can also be taken to prevent negative pressure in an irrigation system, such as ensuring that all pipes and fittings are properly sealed and maintaining a proper water supply pressure.
Operation and test
The vacuum relief valve works by opening automatically when a vacuum or negative pressure is detected in the system. This can occur when the water supply is suddenly turned off or when air is drawn into the system through leaks or other openings. When the valve opens, it allows air to enter the system and equalize the pressure, preventing damage caused by the vacuum or negative pressure.
Most of the vacuum reliefs are practically maintenance free. If the air released constantly then they have to be dismantled and cleaned.