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Arc
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Describes the circular rotating pattern of the spray on a sprinkler. For example, a sprinkler with a 180-degree arc would spray a half-circle.
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Check Valve
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A tiny device facilitating the movement of water in only ONE direction.
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Controller
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Also commonly referred to as a “timer,” this device is responsible for turning an automatic irrigation system on and off. Once programmed to operate on its own, it can perform a variety of functions.
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GPM
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This is an abbreviation for gallons per minute, a reference unit in regards to volume of water. Each sprinkler head requires a specific GPM to operate effectively.
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Main Line
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A pipe that connects the water supply to the control valves in each irrigation zone.
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Polyethylene Pipe
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A black, elastic pipe that is often used in irrigation systems that withstand colder climates.
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PSI
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This is an abbreviation for Pounds Per Square Inch, a common reference unit in regards to water pressure.
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Polyvinyl Chloride Pipe (PVC)
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A white, rigid pipe that is often used in irrigation systems that withstand warmer climates.
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Rotors
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Sprinklers that discharge a steady flow of water to irrigation areas.
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Spray Head
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Sprinkler heads with interchangeable nozzles that spray water in specific circular patterns.
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Station
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Each zone of the irrigation area that is controlled by a separate valve. When purchasing a timer, if there are 6 zones on the landscape, you will need a 6-station controller.
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Zone
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An irrigation area under the control of one sprinkler valve.
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