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Lawn sprinkler control valves are used to control the flow of water throughout your lawn sprinkler system. These valves are controlled by your sprinkler timer via a 24 volt a/c signal through copper wire. They can also be opened and closed manually. Lawn sprinkler control valves consist of the following components: electric solenoid, manual bleed screw, cap/lid, spring, diaphragm, and lower housing. There are two reasons you need several sprinkler control valves in your lawn sprinkler systems. The main reason is water supply. Most homes simply do not have a water supply large enough to run the entire sprinkler system at once. Control valves break your system into zones based on the available water supply. Your timer cycles through the entire system opening one valve at a time. The second reason you use valves is for control - hence the name control valve. This allows you to have a sunny area controlled by one valve and a shady area controlled by a separate valve.