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Backflow preventers can also help prevent damage to your plumbing system. Sudden changes in pressure inside your pipes — which backflow preventers stop — can cause a sudden jolt to your pipes caused by pressure changes, commonly called a water hammer. Water hammer, caused by something as simple as de-winterizing your sprinkler system, can damage your plumbing, potentially leaving you with expensive repairs and costly water damage.

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The pressure reducing valves are commonly installed in residential plumbing works such as after water meters or just before entering houses. The pressure ...

Preventing backflow is mandatory in some capacity in all states — although the specifics regarding the lengths to which you need to go to keep public water supplies safe varies based on state, county, and city. Aside from health issues, you could face monetary assessments and fines if your backflow prevention system isn’t present or isn’t up to plumbing code.

When it comes to drinking water, the last thing you want is a potentially harmful contaminant that could cause harm to you or a family member. Backflow preventers are key to maintaining safe, clean drinking water — especially in areas where non-potable water could mix with your potable water supply.

A check valve is a simple one-way valve that prevents water from flowing backward through a pipe. These are usually installed on faucets, toilets, dishwashers, and other fixtures to prevent backflow where only a small amount of water could work its way back into your supply.

In most cases, homes will have a backflow preventer if they have an in-ground sprinkler system. It’s usually installed above ground for easy access. It will typically have a ball valve or shut-off valve handle on it and sits between two pipe sections coming up out of the ground and turning toward each other at a 90-degree angle.

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Watts Regulator 0061935 Backflow Preventer 9D-m3 1/2"Watts Regulator Co.1/2" 9D-m3 Backflow PreventerWith Intermediate Atmospheric VentMeets A.S.S.E. Std. 10120246CAsse 1012 Max. 175 PsiMax. Backflow Temp. 250°N.Y.C. Bsa 104-75-smB64.3Edp# 00619350 98268 22179 4765.03.00.290Backflow Preventer-1/2"Watts-9D-250°FUsaWeight: 530 Gm

Generally speaking, there are three different kinds of backflow preventers, each designed for a different severity level. The three kinds of backflow prevention assemblies include the following:

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We get a decent number of questions about backflow prevention devices from homeowners across the country. We’ll answer some of the most common ones we see below.

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21 Nov 2015 — So I understand the idea of installing the feed valve at the location of zero pressure change, but some guys however will argue this till ...

Backflow is a term used to describe when water flows backward through your plumbing pipes. Your water supply is designed to flow in one direction only, bringing clean water to your fixtures. When water flows backward — especially in situations where whatever is flowing backward could be contaminated — you could get potentially harmful water in your city water supply or home.

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Backflow can cause very serious health concerns for your home and, potentially, anyone connected to the same water supply. If you’re on a water well, that could mean only your immediate neighbors, but it might mean anyone in your city if you’re connected to a municipal water supply. In the case of bacterial infiltration, you could end up infecting all the water delivered to your entire city.

This guide will discuss what a backflow preventer is, what it does, the three main kinds of backflow preventers, and why you might need one in your home.

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Backflow preventers work by maintaining a low-pressure vacuum sealed by two check valves. If the pressure inside the low-pressure chamber gets too high — which would normally cause backflow to occur — the water gets expelled through a relief valve. The relief valve will remain open until the pressure regulates itself once again.

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RPZs are the most effective kinds of backflow preventers, and they’re also the most expensive. They’re used in cases where the risk of backflow is high and the potential consequences are very serious. Some use cases include commercial buildings, high-occupancy buildings like apartment buildings or hotels, municipal water systems, and some fire sprinkler systems — specifically those in industrial buildings.

Backflow Preventer

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Backflow preventers can purge large volumes of water to prevent backflow, so the relief valve is usually installed where water damage wouldn’t be an issue and drainage is available.

This Back Flow Prevention unit is designed to keep your Ozone Generator safe, by taking the water that backs up from you venturi and actively trapping and ...

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Check valves are usually one component inside of a backflow preventer, which is designed to resist higher pressure differences, as in the case of an irrigation system, fire sprinkler system, or main water supply. Backflow preventers can also contain high- or low-pressure chambers and relief valves to help prevent backflow even in high-risk situations.

RPZs are the most complex and effective types of backflow preventers available. They use two check valves for redundancy, plus a chamber between them that sits at a lower pressure. If the pressure inside that chamber ever gets too high, which would only be caused by backflow, there’s also a pressure relief valve that will empty the chamber until the pressure on the receiving end of the cross-connection has subsided.

The pressure relief valve is designed to eliminate water in the plumbing pipes until the pressure is normal again — so, during backflow, it will spit water out. As such, RPZs are often installed outdoors where drainage is possible, and the risk of flooding is minimal.

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PVBs and DCVAs are typically used in cases where backflow is a medium risk. These include some residential sprinkler systems, commercial irrigation systems, and fire sprinkler systems.

A backflow preventer is designed to stop water from traveling in both directions. It gets installed in-line and uses one-way valves or vacuums to prevent backflow. Backflow preventers come in a few designs based on how severe backflow through a particular water line would be considered.

AVBs are best for situations where the risk of backflow is low, and the consequences are minimal. Common uses typically include garden hoses and in-ground sprinkler systems.

AVBs use a simple check valve and an air inlet valve to prevent water from flowing backward. The air inlet valve is designed to open and allow air in when the water pressure on the check valves gets too high. This introduces air into the sealed pipe, breaking the vacuum inside and preventing back-pressure and back-siphoning.

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Like AVBs, PVBs are backflow prevention assemblies with a check valve and an air inlet valve to prevent backflow. However, they also use a high-pressure chamber between the two to prevent water from flowing backward. The differential is designed only to be overcome by water from the supply side and should prevent sudden spikes in pressure on the opposite end of the cross-connection.

PVBs generally require permits and need to be installed by licensed and certified plumbers. Since the risk and consequences of backflow in cases where you’d use PVBs are high and severe, most cities and states don’t allow for legal DIY installation.

RPZs should never be installed by homeowners. These backflow preventers require a permit and a certified plumber to ensure they’re installed correctly and that adequate drainage is possible in the event of purging during backflow.

A backflow preventer is designed to stop water from flowing backward through your pipes. In the case of a sprinkler system, installing one can prevent harmful contaminants like fertilizers, pesticides, and bacteria from getting into your drinking water. They can also keep public water supplies from getting contaminated with dirty water.

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On a more personal level, backflow from in-ground sprinklers could introduce pesticides, fertilizers, harmful bacteria, fungi, and other contaminants into your drinking water. Keeping your drinking water clean for your family should be your top priority, so preventing backflow into your own water is crucial.

A water conditioner works to temporarily change the chemistry of hardness particles, resulting in a reduction of scale build-up in plumbing, for a certain ...

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A double-check valve assembly (DCVA) works similarly, but it use two check valves for redundancy and greater protection.

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Whether you’re uncomfortable doing the work yourself or legally need a professional to help, you can use the tool below to get connected to reputable and certified plumbers in your area.

While most homeowners can handle installing a backflow preventer on a sprinkler system, most shouldn’t or can’t legally tackle installation if it’s done on a water main or a higher-volume supply line.

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AVBs are super simple to install, so most homeowners should be able to handle it themselves. Plus, since there’s minimal risk of backflow from a garden hose, there often aren’t any permits required or guidelines to follow for the installation. This can vary, though, so be sure to check local guidelines.