Air/Vacuum Relief Valve

The air release feature allows air to escape the pipeline during sysem start-up, while the vacuum relief feature allows to enter the pipeline during valve closure or system shutdown.

The vacuum relief minimises:

• Collapse of mainline and submain pipes due to the vacuum.
• Back siphonage of dirt into emitters.  (Vacuum relief can reduce this problem and in some cases eliminate it.)
• Water hammer caused by sudden reversal of flows, especially downstream of a valve.

FEATURES

• Available in 25mm and 50mm male BSP threaded inlets.
• Innovative slam resistant design ensures only water closes the valve.