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<br />Rotor: Type of sprinkler that rotates as it emits water. Most rotors have separate part <br />circle or full circle models. Full circle models do not have adjustable arcs. Part circle <br />models generally have adjustable arcs (between 20 and 360 degrees). Rotors operate <br />optimally between 50 and 80 psi and are used to water large areas because the radius of <br />throw is between 15 and 150 ft. Rotors have a lower precipitation rate than sprays. <br />(Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Seal-A-Matic (SAM): Feature available for Rain bird heads. It is an in stem checl<- <br />valve that prevents drainage from sprinkler heads at low points of the irrigation system. <br />(Rain bird CD-ROM: Intro to spray heads) <br /> <br />Solenoid: The part of the valve that controls the pilot plunger. When the solenoid <br />receives an electrical signal from the controller, it activates the pilot plunger to raise <br /> <br />Service Line: The water pipe that connects the water main to the property. (Rain bird <br />CD-ROM: What is an Irrigation System?: Components). <br /> <br />Spray head: A type of sprinl<ler that sprays a fixed sheet or stream of water without <br />rotating; often referred to as a "pop-up" or "fixed spray head." Spray heads operate <br />optimally at 30 psi (in-between 20-40 is ok) and are used to water small areas because the <br />radius of throw is between 5 and 22 ft. Spray heads have a higher precipitation rate than <br />rotors. (Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Spring: The coiled metal device that retracts a sprinl<ler head or helps a hydraulic valve <br />close. <br /> <br />Square Spacing: The term given to a sprinkler head layout pattern where the sprinklers, <br />when viewed from above, appear as more or less a square with one sprinkler in each <br />comer. See also the more efficient "triangle spacing". <br /> <br />Swing Joint: A flexible connector used to attach sprinklers to lateral pipes. Traditional <br />fittings are inflexible and if they are used to connect the sprinl<ler to the lateral pipes <br />problems could arise. If the sprinl<ler heads are run over by maintenance equipment or if <br />they are stepped on, then the pressure will break the lateral pipe; swing joints allow the <br />sprinkler and connecting fittings to flex rather than break. Swing joints also make it <br />easier to adjust the height of the sprinl<ler head when trying to make the head flush with <br />the ground. (Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Triangle Spacing: The term given to a sprinkler head layout pattern where the <br />sprinklers, when viewed from above, appear as a more or less equilateral triangle with <br />one sprinl<ler in each corner. Triangular spacing results in the most uniform and efficient <br />water application using sprinl<lers. <br /> <br />19 <br />