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Most automatic irrigation valves are diaphragm valves in which the water above the diaphragm must be discharged for the valve to open. In a hydraulic system, the controller and valves are connected via small plastic tubes approximately 4 mm (¼ in) in diameter. The controller opens the tube connected to the valve, allowing that valve to open.
A small center pivot system from beginning to end. Irrigation equipment can also be configured to move in a straight line, where it is termed a lateral move, linear move, wheel move or side-roll irrigation system. [11] [12] In these systems the water is supplied by an irrigation channel running the length of the field. The channel is positioned ...
Some irrigation rain sensors also contain a freeze sensor to keep the system from operating in freezing temperatures, particularly where irrigation systems are still used over the winter. Some type of sensor is required on new lawn sprinkler systems in Florida , [ 1 ] New Jersey , Minnesota , [ 2 ] Connecticut and most parts of Texas .
Rainguns are similar to impact sprinklers, except that they generally operate at very high pressures of 2.8 to 9.0 bar (280 to 900 kPa; 40 to 130 lbf/in 2) and flows of 3 to 76 L/s (50 to 1,200 US gal/min), usually with nozzle diameters in the range of 10 to 50 mm (0.5 to 1.9 in).
A sprinkler system timer is an electrical device that is used to set an irrigation sprinkler system to come on automatically at a certain time. Irrigation timers first appeared in the early 1960s to control large-radius lawn sprinklers, which at the time usually contained their own electrically operated valve (most golf-course sprinklers still use this type of actuation).
Wireless sensor networks have been developed for machinery condition-based maintenance (CBM) as they offer significant cost savings and enable new functionality. [19] Wireless sensors can be placed in locations difficult or impossible to reach with a wired system, such as rotating machinery and untethered vehicles.