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<br />sprinklers in that zone stop emitting water. (Rain bird CD-ROM: What is an Irrigation <br />System?: Components). <br /> <br />Dynamic pressure: The pressure at a given point in an irrigation system with water <br />flowing. (Rain bird CD-ROM: What is an Irrigation System: Components) <br /> <br />Electromechanical controller: A controller that uses motors and gears, and is usually <br />programmed by pushing in pins on a dial. (Rain bird CD-ROM: What is an Irrigation <br />System?: Controllers) <br /> <br />Electronic controller: A controller that uses a microprocessor and has a display. (Rain <br />bird CD-ROM: What is an Irrigation System?: Controllers) <br /> <br />Emergency Shut-off Valve (Master Valve): A manual valve located on the irrigation <br />main that turns the system's water on or off if the system needs to be repaired. (Rain bird <br />CD-ROM: What is an Irrigation System?: Components). <br /> <br />Emitter: A term used with drip irrigation. The emitter, or dripper, is a small device that <br />controls the flow going to the soil. Emitters come in many different flow rates and styles. <br /> <br />External bleed: A feature which allows an automatic valve to be opened manually <br />(without controller) by releasing water from above the diaphragm to the outside of the <br />valve. Useful during installation, system start-up and maintenance operations. <br /> <br />Fittings: Fittings attach pipes with other irrigation components. They can be made of <br />plastic, brass, steel and may be threaded, glued, or soldered to the lateral pipes. <br /> <br />Field Wires: Waterproof wires used to connect a controller to its valves (Rain bird CD- <br />ROM: What is an Irrigation System?: Intro to Valves) <br /> <br />Fixed Riser: A fixed riser is a pipe that connects the sprinl<ler head to the pipe <br />underground. They should only be used in areas where foot traffic is not an issue <br />because the pipe remains above ground whether or not the sprinkler is emitting water. <br />(Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Flow control: A valve component that allows adjustment of the outlet water flow and <br />pressure by controlling how far a valve will open. (Rain bird CD-ROM: What is an <br />Irrigation System?: Valves). <br /> <br />Flow control handle: Lets you adjust the outlet water flow and pressure by controlling <br />how high the diaphragm can rise. (Rain bird CD-ROM: What is an Irrigation System?: <br />Valves). <br /> <br />Globe Valve: A type of valve in which the inlet and outlet openings form a straight line. <br />(Rain bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />15 <br />