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Backflow Preventers


Irrigation backflow devices are designed for installation on potable water lines to protect against both back-siphonage and back-pressure of contaminated water into the potable water supply. Backflow assemblies provide protection where potential health hazards exist.

Backflow Prevention Devices

Backflow prevention devices are offered in four different types here at Sprinkler Warehouse: Double Check Valve Assemblies, Pressure Vacuum Breaker Assemblies, Reduced Pressure Zone Assemblies, and Atmospheric Vacuum Breakers. Each type is suited to different needs, from small home lawn irrigation systems to large commercial property irrigation.

Backflow Preventers

Sprinkler system backflow prevention devices are safety mechanisms to prevent contaminants from entering water supplies. Irrigation backflow devices are designed for installation on potable water lines to protect against both back-siphonage and backpressure of contaminated water into the potable water supply. They are required by law in many areas, but even if not required, they are still an important safety feature that is highly recommended. The valves typically included in sprinkler systems are not enough to prevent backflow. These valves can break or develop leaks, and if this happens to a sprinkler system without a backflow preventer device, the chemicals from the irrigation water (fertilizers, pesticides, animal wastes, etc.) can flow back into the water supply. The chemicals in irrigation systems are potentially toxic. Our Sprinkler School is an excellent source for additional information on backflow prevention and devices, how they protect our water supply, and choosing a backflow device.

Backflow Preventers
Backflow Preventers

Backflow Prevention Devices

Backflow prevention devices are offered in four different types here at Sprinkler Warehouse: Pressure Vacuum Breaker assemblies, Double Check Valve Assemblies, Reduced Pressure Zone Assemblies, and Atmospheric Vacuum Breakers. Each type is suited to different needs, from home lawn irrigation systems to large commercial property irrigation.

Pressure Vacuum Breaker Assemblies

Pressure vacuum breaker assemblies (PVBA) are the most commonly used and least expensive type of whole-system backflow prevention valve. The benefits of this type of sprinkler backflow preventer valve are its low cost and simplicity. These assemblies are easy to install, maintain, and repair. Some models of pressure vacuum breaker assemblies include built-in freeze protection valves; however, pressure vacuum breakers only protect the assembly itself, not the water lines. These breakers will also occasionally eject some water, so it is essential to purchase a spill-resistant model for indoor installation, or for any area where water spillage would create a nuisance. Air gap drains are also required when installing indoors.

Double Check Valve Assemblies

Double check valve assemblies (DCVA) are the most commonly approved type of device for inline underground sprinkler systems and a good choice for interior or underground installations. These backflow preventers are less susceptible to frost damage because they are usually installed below ground or in a basement making sprinkler system winterization much simpler. Double check assemblies are also less expensive than reduced pressure zone assemblies. However, double check valve assemblies are not approved as a backflow prevention device for water systems containing hazardous substances. Double check assemblies are generally considered safe for sprinkler systems which do not have chemicals injected into the water.

Backflow Accessories

In addition to backflow prevention valves, Sprinkler Warehouse also carries a wide assortment of backflow prevention accessories. These accessories include backflow prevention system attachments, backflow device enclosures, test kits, repair parts, and insulated pouches.

Backflow Preventers
Backflow Preventers

Reduced Pressure Zone Assemblies

Reduced pressure zone assemblies (RPZ), also called reduced pressure principle assemblies, are the industry standard for any type of commercial property, including apartment buildings and condominiums, because they provide the highest level of protection against pollutants and toxins. Reduced pressure zone assemblies are the most expensive and complicated backflow valves to install; however, when installed correctly, these are the safest and most reliable backflow valves available. They are also usable for any plumbing or water system which requires a backflow device, not just irrigation systems.

Backflow Prevention Repair Parts and Y-Strainers

Sprinkler Warehouse also supplies backflow prevention repair parts compatible with double check assemblies, pressure vacuum breakers, and reduced pressure assemblies, from a variety of manufacturers. Y-type strainers are filters that protect backflow devices by filtering sediment from the system.

Atmospheric Vacuum Breakers

Atmospheric vacuum breakers (AVB) are the simplest design of backflow preventer. If you have less than six control valves, they are the least expensive, but also the least reliable option. These devices are not designed as a whole-system backflow prevention valve; one must be installed at every control valve. Sprinkler Warehouse does not recommend AVB's for irrigations systems where there is a potential to contaminate drinking water. AVB's are not testable and it is not possible to detect when one has failed.

Backflow Prevention Test Kits and Repair Parts

Backflow prevention test kits and repair parts are a must for the avid do-it-yourselfer. Our backflow test kits are compatible with all reduced pressure principle, double check valve, spill resistant, and pressure vacuum breaker type backflow preventers. All our kits are compact and portable, and come with the necessary gauges, hoses, and adapter fittings.

Backflow Prevention Device Enclosures

Backflow prevention device enclosures provide everything from theft-prevention to heated insulation. If you are concerned about theft of your backflow device or you want to winterize your backflow device with a heated insulation enclosure, or you simply want something more pleasing to the eye than a pipe sticking out of the ground, our backflow device enclosures are the thing for you.

Backflow Preventers