The sprinkler valves in a system can vary from the simple manual on/off devices, to sophisticated control equipment with solenoids that act as electronic open/close devices that are controlled by a sprinkler timer or sprinkler controller to deliver precise timed amounts of water. Water sprinklers and drip irrigation systems use these valves for turning on and off the water flow to the specific irrigation zone. These valves are also known as irrigation valves, sprinkler valves, anti-siphon valves, zone control valves, drip zone valves, and lawn valves.