If you’re a fan of saving water and protecting your irrigation system, this water gatekeeper could be the answer.
Efficient water management is at the heart of a sustainable irrigation system. One key component that plays a critical role in conserving water and preventing costly damage is the mighty master valve.
So, what is a master valve and how does it work? A master valve is an automatic electronic valve installed on the mainline of an irrigation system, typically downstream of a water meter and backflow prevention device. This valve opens only when an irrigation zone cycle is in operation and closes when the cycle is complete. Basically, it acts as a water gatekeeper for the entire irrigation system network.
When the irrigation controller starts a timed watering cycle for a zone, it simultaneously opens the master valve and the specific zone valve that is scheduled to run. Once watering is complete, both valves close.
But here’s the brilliant part: If a leak, break or malfunction occurs downstream of the master valve, the system automatically stops the water supply when the master valve closes, preventing any continuous water loss and potentially saving thousands of gallons.
Without a master valve, a damaged pipe or stuck-open zone valve can allow water to run continuously, often going unnoticed for hours or even days.
If your irrigation system already has a master valve installed, fantastic! If not, there are options available and you may even qualify for a Residential Irrigation Design rebate to have one installed.
When considering options to install a master valve, it’s essential to understand its role in managing water flow and preventing leaks. Keep these key points in mind:
- Location: The master valve should be installed just after the backflow prevention device. This placement ensures the valve is the first line of defense in case of a break or leak in any other component of the irrigation system downstream.
- Wiring: Proper wiring is crucial for the master valve to function properly. If accessible, the first (and ideal) option is to manually hardwire the master valve to the already existing irrigation controller. Most modern controllers will have a designated slot or terminal labeled “MV” or “P/MV.” This method ensures the master valve opens and functions properly with the existing watering program.
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- A secondary option is the use of a battery-operated controller which the master valve would be connected to within its own valve box. Battery-operated irrigation controllers function just like a regular irrigation controller, only that it uses battery power and would not need to be hardwired to the existing controller. If considering this method, make sure to synchronize the battery-operated controller to the watering schedule of the existing controller. It’s also critical to routinely check the battery life to ensure it’s still receiving power and functioning properly.
- Testing: After installation, test the system to ensure that the master valve operates correctly and accordingly with the rest of the irrigation system. When the system is on, the master valve should open and allow water to flow. When the system is off, the master valve should close, stopping all water flow beyond the master valve.
For the implementation of a master valve to an already existing system, we recommend hiring a licensed irrigator for the installation to ensure the modification to the irrigation system is done correctly and meets state and local regulations.
If you’re unsure if your irrigation system needs a master valve, SAWS is here to help. Give us a call to schedule a free irrigation consultation. One of our expert consultants will stop by and help you identify any problems as well as give you recommendations for your system and landscape.
