Laserfiche WebLink
<br />Globe/Angle Valve: A valve in which water either flows straight through the valve <br />(Globe valve) or at a 90 degree angle (Angle Valve). The unused port is plugged. (Rain <br />bird CD-ROM: What is an Irrigation System?: Components). <br /> <br />Head to Head: In irrigation "head to head" refers to the situation where sprinklers are <br />spaced so that the water from one sprinl<ler throws all the way to the next sprinl<ler. Most <br />sprinklers are designed to give the best performance when head to head spacing is used. <br /> <br />Hydro-Zone: An area of an irrigation system where all the factors that influence the <br />watering schedule are similar. Typical factors to be considered would be the type of <br />plants, the precipitation rate of sprinl<lers or emitters, solar radiation, wind, soil type, and <br />slope. See the related term "valve zone". <br /> <br />Impact rotors: Rotors that are driven by the force of water hitting a spring-loaded <br />"arm", causing it to impact the sprinl<ler body and rotate slightly upon each impact. (Rain <br />bird CD-ROM: What is an Irrigation System?: Rotors). <br /> <br />Inlet Port: The part of the valve where water flows in from the mainline. (Rain bird <br />CD-ROM: What is an Irrigation System?: Components). <br /> <br />Internal bleed: A feature which allows an automatic valve to be opened manually <br />(without controller) by releasing water from above the diaphragm to the downstream side <br />of the valve internally. Useful during installation, system start-up, and maintenance <br />operations when it is undesirable for water to escape into the valve box. (Rain bird CD- <br />ROM: What is an Irrigation System: Valves). <br /> <br />Isolation Valve: A valve used for isolating all or part of the irrigation system for repairs, <br />maintenance, or winter shut-down (winterization). Common types of isolation valves are <br />the ball valve, butterfly valve and the gate valve. <br /> <br />Lateral pipe: The name given to the pipes which go from the control valves to the <br />sprinklers or drip emitter tubes. Lateral pipes on residential sites generally range from <br />3/4'" to 2"; lateral pipes will generally be larger on commercial sites. <br /> <br />Lower Chamber: The part of the valve that connects to the outlet port. When the <br />diaphragm is raised, water flows from the upper chamber to the lower chamber and out <br />the outlet port into the lateral pipes. (Rain bird CD-ROM: What is an Irrigation System?: <br />Components). <br /> <br />Mainline: The pipe that brings pressurized water from the property's service line to the <br />irrigation system. An irrigation main is usually continuously pressured and therefore <br />needs to be composed of a pipe that is thicl<er and stronger than the pipe used for lateral <br />lines. It runs from the point of connection to the control valves. (Rain bird CD-ROM: <br />What is an Irrigation System?: Components). <br /> <br />16 <br />