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Several factors must be taken into consideration when selecting a backflow device. These include local building codes regulating backflow preventers, the size of the landscape to be irrigated, and where the backflow preventer is going to be installed. It’s a good idea to familiarize yourself with the different types of backflow devices. It will help you to select the one that best meets your requirements.

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FBV 3 isn’t your average foot controller. Thirteen steel footswitches—five with assignable color LEDs*—help you easily keep track of active amps and effects. Dedicated footswitches for bank up/down make it fast and easy to scroll through your presets. A built-in expression pedal with a wah/volume toe switch gives you even more control of sweeping effects. A dedicated tap tempo footswitch enables you to quickly synchronize time-based effects like delay and echo. And a chromatic tuner keeps every note sounding great.

Pressure vacuum breaker assemblies (PVB) are the most common, inexpensive type of whole-system backflow preventer. It consists of an inlet shutoff valve at the bottom, a single valve body consisting of a pressure vacuum breaker, a check valve, two test cocks, and an outlet shutoff valve. As well as being inexpensive, PVBs are relatively simple in design and are easy to install, maintain and repair. Some pressure vacuum breakers also offer built-in freeze protection; however, this only protects the PVB assembly. Inlet and outlet pipes can still freeze if the system isn’t properly winterized.

Reduced pressure zone assemblies come in a variety of configurations. Choose an “inline” or “straight” configuration for installation underground. For above-ground installation, consider an “n” configuration assembly for a very small footprint.

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When you’re performing, the last thing you want to worry about is your gear breaking down. With steel hardware and rugged metal casing, FBV 3 is built to withstand even the toughest gigs—night after night. A single cable supplies both power and communication to your amp, keeping your setup clean and simple. The illuminated and backlit LCD display is big, bright, and easy to read—so you can see the active preset name, number, and the chromatic tuner at a glance.

There are multiple types of backflow preventers. The three most common are the pressure vacuum breaker (PVB), the reduced pressure zone (RPZ), and the double check assembly (DCA). These are all installed in the water system immediately after the isolation valve. There is a fourth backflow preventer which is also fairly common. The atmospheric vacuum breaker (AVB) is installed in each zone of the sprinkler system. After that, it immediately follows the zone control valve. Each type of backflow device is designed to provide a different level of protection for varying commercial or residential applications. For example, hospitals and morgues, which handle large quantities of hazardous wastes on a daily basis, require much heavier-duty backflow preventers than a residential irrigation system.

FBV™ 3 is a next-generation foot controller that gives you total hands-free control of Line 6 amps and effects. Save and recall your favorite presets and much more. It’s the ultimate tool for performing guitarists. After all, you should focus on your performance—without being tied to the knobs on your amp.

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Installed either above ground or inline (underground) Do not use with chemigation May be installed horizontally or vertically, but horizontally is preferred May be installed where the potential for back-siphonage or backpressure is present.

Double check valves (DCV, also called double check assemblies or DCA) are a good choice for underground or indoor installations. A DCA consists of an inlet shutoff valve, two independently operating spring-loaded check valves (usually inside a single valve body), four test cocks, and an outlet shutoff valve. If local building codes allow for it, you must install Double check assemblies vertically.

AVBs are also the least reliable and least often recommended. Most large cities and suburbs do not allow the use of atmospheric vacuum breakers in lawn sprinkler systems. Do not use AVBs in areas of constant pressure. This includes where shutoff valves would be located downstream where there is a potential for back pressure, or on any system that incorporates chemigation techniques.

Some localities, such as Honolulu, do not allow reduced pressure zone assemblies to be installed below grade in underground lawn sprinkler systems, while others require copper pipes on both ends of the assembly. Local codes may be especially variable and stringent on reduced pressure zone assembly, so have a thorough understanding of local requirements before proceeding.

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Reduced pressure zone assemblies (RPZ), also sometimes called a reduced pressure principle assembly, is the most complex and expensive backflow preventer. However, when working properly, RPZs are the most secure and reliable of all backflow prevention devices. A reduced pressure zone assembly consists of an inlet shutoff valve, two independently operating spring-loaded check valves separated by a pressure differential relief valve, four test cocks, and an outlet shutoff valve.

The DCA is the most common type of approved backflow prevention device for use in underground or in-line installations. In-line (or below-grade) simply means that the backflow device is parallel with the piping of the sprinkler system; unlike the PVB, the DCA does not have to be installed 12 inches above the highest point in the system. Some areas do require above-ground installation, so check with local authorities before installing below ground.

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The image above shows the Febco 825Y Reduced Pressure Zone Backflow Preventer. Shop for this and other backflow preventers at SprinklerWarehouse.com.

1 May 2023 — Reduced pressure zone devices are purpose designed backflow prevention valves used in the water industry for high hazard cross connection ...

It is possible to build a double check valve assembly from new components, but this is not the best option as there is a high risk of built assemblies not meeting local code. A better option, for convenience, cost-effectiveness, and coding restrictions, is to purchase a pre-assembled double check valve assembly.

Residential backflow preventers typically are found on systems for filling swimming pools and water features, and on fire sprinkler systems.

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Atmospheric vacuum breakers (AVB) are the simplest and least expensive backflow preventers for one or two-zone irrigation systems. An AVB must be installed on the pipe directly after every control valve, so for systems with more than about six control valves, AVBs are not cost-effective.

The 1/4′′ RO Automatic Shut-Off Valve is designed to be used with a float valve to shut off an RO system. It utilises back pressure created by the float valve.

One of the downsides of PVBs is that they will occasionally eject some water. Choose a “spill-resistant” model of PVB for indoor installations or any time spillage would create a nuisance. An air gap drain is also required if the valve is installed in a basement or other interior space.