Control valves are the valves that turn on and off the water to individual “circuits” or areas of the yard that are irrigated separate from one another.The control valves can be automatic (usually electric-powered using a solenoid) or manually operated (hand-powered, ie; turn, turn, turn!) There may be just one control valve or there may be several control valves on a drip irrigation system.For example one control valve may turn on and off the water to emitters/drippers in a vegetable garden.Typically an isolation valve is located at the water source so the water can be shut off for repairs or shut off during the non-irrigation season.Isolation valves may also be installed anywhere on the irrigation system to allow the shut down of sections for repair, this is common on large systems where shutting down the whole system for a repair would be inconvenient.
Another control valve might turn on and off the water for the emitters at shrubs around the house.The argument can be made that it is the future of irrigation.The typical water savings with drip and low-volume irrigation ranges anywhere from 30 to 70 percent.Water is seeped slowly at or near plant root zones. By contrast, flow rates from traditional overhead irrigation sprays and rotors are always measured in gallons per minute (gpm). Micro sprinklers, micro sprays and micro bubblers, connected by flexible tubing staked above ground, are also part of low-volume irrigation.These are usually used for denser groups of plants, such as shrub beds.