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What is a Master Valve in Irrigation?

What is a Master Valve in Irrigation?

A Master solenoid valve is a solenoid valve often installed at the head of your water supply which, when wired to the “MV” or “P” terminal, will open at the same time as any of your zone solenoid valves. The Master solenoid valve operates as an “insurance” valve. In the unlikely event of one of your zone solenoid valves sticking open, it is very unlikely that the Master solenoid valve would stick open as well, therefore water will be prevented from running continuously.

Master solenoid valves are a sensible idea when your system involves the installation of a main pipeline. Should the main pipeline be damaged during gardening, fencing, building etc, the Master solenoid valve will be closed when no watering cycle is in operation, therefore preventing a flood.

Note: A garden tap installed into a main pipeline governed by a Master solenoid valve will only have water available when the master solenoid valve is opened, either electrically or manually.

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