Reduced pressure backflowAssembly

This assembly uses a mainline reduced pressure backflow assembly equipped with two resilient seated indicating shutoff valves, a bypass arrangement containing a smaller reduced pressure backflow assembly, and water meter. The RPDA must be installed at least 12 inches above finished grade or the 100-year flood plain, whichever is greater.

With a restaurant on the ground floor and six housing units above, 141 Fifth Ave. is one of 56 affordable multifamily buildings in South Brooklyn owned and managed by Fifth Avenue Committee (FAC), a non-profit community development organization. It is in the unshaded X flood zone – above the 500-year flood line – but basement stormwater flooding is a constant challenge. During heavy rains – up to 10 times a year – the basement fills with about 1 ft. of water.

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During normal operation, the pressure between the two check valves, referred to as the zone of reduced pressure, is maintained at a lower pressure than the supply pressure. If either check valve should leak, the relief valve is designed to open and discharge water to the outside.

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Some residents choose to install a backflow device on their hose bib. These are called vacuum breakers and they do not need to be tested. You can purchase them at most plumbing and hardware stores.

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The assembly consists of two spring-loaded check valves, a bypass assembly with a water meter and double check valve assembly, and two resilient seated indicating shutoff valves.

The location of the assembly, service size, and hazard level of the connection determine which backflow assembly you should use. If you have questions about which type of assembly you need, contact the Water Bureau Water Quality Inspection staff at 503-823-7480. Below are some assemblies commonly used in commercial applications. More information about the all the following assemblies can be found on our backflow assembly installation requirements page.

Reduced Pressure backflow preventervsbackflow preventer

The reduced pressure backflow assembly (RPBA) is designed to prevent backflow caused by backpressure or backsiphonage and may be installed on either low- or high-hazard connections. Backsiphonage is when water moves in the direction opposite its regular flow.

In 2011, FAC installed a backwater system at 141 5th Ave. A sump pump removes water that builds up when it rains, and the backwater valve prevents additional stormwater from forcing its way into the building. The building manager has also implemented a flood action plan. Staff are trained in system operation and communication protocols that alert residents to stop using water fixtures when the valve is engaged.

A properly functioning RPBA will periodically release small amounts of water due to changes in line pressure up or downstream of the assembly.  For this reason, this type of assembly should be installed in areas that are not subject to water damage and have proper drainage. When backflow happens, a properly functioning RBPA may release some water. If the RPBA becomes clogged by debris or is not functioning properly and needs repair, it may discharge a large volume of water.

Cast-iron backwater valves may be damaged in areas with salt water and heavy minerals in the water. Check them regularly for rust and internal corrosion.

One step you can take to protect our drinking water is to keep the ends of hoses out of pools or other containers while you are filling them. For example, if a hose is submerged in the pool, the chlorinated pool water may enter the drinking water system during a backflow condition. When filling pools, keep the end of the hose out of the pool and have a gap between the end of the hose and the surface of the water. This gap must be twice the diameter of the hose and never less than one inch.

The AVB is among the simplest and least expensive mechanical types of backflow prevention device that the end user can buy. The PVBA is an outgrowth of the AVB and evolved out of a need to have an atmospheric vacuum breaker that was testable and could be used under constant pressure.

Reduced pressure backflow preventervs Double check valve

Should the backwater valve be closed to prevent stormwater from entering the building, it would also prevent stormwater collected onsite from leaving, causing flood damage inside the building. Consider other options for managing stormwater onsite, such as storing it in rainwater cisterns or infiltrating the water into the site.

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Backwater valves are installed where the wastewater pipe exits the building, so sewage only flows outward. Valves have a hinged flapper that remains open to allow outward flow, but seals tightly if there is backpressure.

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Reduced pressure backflow preventerleaking

There are two types of vacuum breakers: the atmospheric vacuum breaker (AVB) and the pressure vacuum breaker assembly (PVBA). The Water Bureau doesn't allow either the AVB or PVBA to be used for backflow protection.

3/4reduced pressure backflow preventer

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Backwater valves should be installed on the street side of the house trap. Improper installation could cause the trap to fail. To ensure smooth flow, there should be at least 2 ft. of un-branched pipe upstream of the backwater valve.

Your plumber or licensed backflow assembly testing company will likely know which type of assembly to use. Backflow assemblies most commonly installed on residential irrigation systems are the double check valve assembly (DCVA) and the pressure vacuum breaker assembly (PVBA). The DCVA may be installed in a vault below finished grade. The PVBA must be installed at least 12 inches above finished grade.

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Reduced Pressure Backflow preventerTest Procedure

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Municipal codes often require the installation of backwater valves in new construction sited in flood zones. Property owners outside flood zones should also consider backwater valves because sewers can back up any time, not just during extreme weather events. Building codes may also prohibit backwater valves. A plumbing professional will be able install a code-compliant system.

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Depending on its size and the configuration of drain piping in the basement, a building may have just one backwater valve connected to the main sewer line, or separate valves may be installed on different lines and drains. Backwater valves should be enclosed in a masonry pit with a waterproof cover giving access for cleaning and maintenance.

Inspect backwater valves frequently to ensure there is no debris in the device or cleanout port and the valve functions properly.

The double check valve assembly (DCVA) is commonly used to protect against backflow hazards that do not pose a health risk. They may be used under continuous pressure and protect against both backsiphonage and backpressure conditions. They can be installed above or below ground, but no more than 24 inches deep or five feet above the floor or grade.

Backwater valves are situated above the external sewer line and should be installed in buildings that have sewer connections below the highest manhole cover in the sewer system, especially if the property is within the Special Flood Hazard Area (SFHA). Although sewer blockage can occur any time, it is most likely to happen during storms when large amounts of water and debris move through the system.

The double check detector assembly (DCDA) protects the potable water supply line from possible contamination or pollution from:

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