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Sometimes called a check valve or a backflow preventer, achemigation valve is an apparatus designed to protect water supplies fromagricultural chemicals used duringchemigation, the application of chemicals such asfertilizers andpesticides throughirrigation water.[1] Most chemigation valves consist of a spring-loadedcheck valve, a low pressure drain, an air and vacuum relief valve, and an injection port for introducing the chemicals downstream of the check valve. Many chemigation valves also have a 4-inch inspection port so that a person can reach inside and feel if the check valve is still functional[citation needed]. Some governments require the use of two chemigation valves installed in series if hazardous chemicals are to be injected[citation needed].
The following policies require or encourage the installation of these valves:
Texas State law Chapter 344.73 in Subchapter D - 1.(b)[citation needed]
Florida's Department of Agriculture and Consumer Services Water Quality/Quantity Best Management Practices for Florida Specialty Fruit and Nut Crops[2] p. 20 specifies that:
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