Turn the knob counterclockwise, the internal gate lifts, and the water flows freely. Turn the knob clockwise and the motion lowers a gate within the faucet that cuts off the water flow. These devices have been around for decades, and the best manual example is the knob on an outdoor faucet, called a sillcock. Gate ValvesĪ gate valve is a barrier that prevents or allows water flow. These are often inline valves that attach to buried lines but are still accessible within a protective box. The low level of electricity in the wires (22 to 28 volts) is sufficient to turn the valves on and off.Īlternatively, valves may be battery operated, in which case they often serve as simple timers that can be programmed to run a limited number of watering zones. During installation, irrigation wires are run in the same trenches as the pipes: one wire from the control unit to each of the valves. Unless a sprinkler system or irrigation system is entirely manual-meaning the user turns it on and off by hand-the valves in the system will be automatic, usually via a central control unit. Some communities require anti-siphon valves, which are easy to test because they’re located above ground, while others permit inline valves and separate backflow preventers. The best type of valve for a specific sprinkler system will depend on local codes. The best anti-siphon irrigation valve is easy to access and made from high-quality materials. They serve to prevent the sprinkler system’s potentially contaminated water from flowing backward into the home’s drinking water supply.
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