The on/off valves alone are not sufficient for preventing backflow. Over time, they can break or leak, allowing chemicals from the irrigation water to flow back into your water supply. These chemicals can include pesticides, fertilizers, and/or animal waste.
There are several types of backflow control valves. Double check valve assemblies (DCVA) are the most common, and are used for inline underground sprinkler systems. They are not approved for the prevention of backflow from irrigation systems containing hazardous substances. They are acceptable for sprinkler systems that aren’t injected with chemicals. Pressure valve breaker assemblies (PVBA) are the least expensive type of backflow control valve. They are easy to install, repair, and maintain. PVBA’s do not protect water lines, only the assembly itself. Commercial properties will use devices called reduced pressure zone assemblies. They have the highest level of protection, and are also the most expensive. If you have less than 6 control valves, atmospheric breakers are your best backflow prevention option. They are inexpensive, and each control valve will need an AVB installed.
You may also want to purchase accessories for your backflow control valves. Filter attachments are available to filter sediment from the system. Device enclosures are good for preventing theft and for heat insulation as a winterizing measure. You can also find test kits and repair kits that are portable and come complete with all the needed fittings and gauges.
Backflow control valves are a simple, inexpensive way to keep your family’s water supply safe from toxic or potentially hazardous chemicals. The importance of these backflow control valves cannot be stressed enough, which is why some areas require them by law. If you need one installed on your lawn sprinkler system or have one that needs repair or maintenance, give us a shout!
