Tag Archives: backflow valve installation

Understanding Sewer Backflow Valves: How They Work and Why You Need Them

understanding sewer backflow valves.

A sewer backflow valve (also known as a backwater valve or sewer backup valve) is a valve you install in your sewer line to ensure that wastewater can only flow in one direction in the pipe. A sewer backflow valve keeps the contents of your sewer line from entering your home during a sewer backup.

In normal circumstances, the water inside your sewer line should flow from your home to the city sewer lines in the street. That is accomplished using the force of gravity. Sometimes, heavy rains can overwhelm the city sewer lines and cause sewage to push backwards into the sewer line and enter your home.

Sewer backflow valves are installed in the sewer line to prevent this costly plumbing emergency in your home, notes the Rockbridge Real Estate team. How does a sewer backflow valve work, how many types of backflow valves are there, and does your home need a sewer backflow valve? Find the answers to these questions in the details below.

How does a sewer backflow valve work?

In the simplest terms, a sewer backflow valve stops sewage from entering your home by opening when water is flowing away from the building and closing if water starts moving toward the house. The components of a sewer backflow valve and details of its operation are explained in the next section.

The sewer backflow valve contains a small flap that can close or open to stop or permit water flow. On the two sides of this flap are small flotation devices. The valve also serves the purpose of letting sewer gases vent. For easy access during maintenance and repair, the backflow valve is often installed inside a cleanout.

To protect your home, the flap stays in the down position when the flow of water inside the sewer line is normal. But if sewage starts to flow backwards, the floaters inside the valve raise the flap to close the channel and keep sewage from entering the home. When the situation returns to normal, gravity pulls the flap back down to reopen the sewer line.

Benefits of a sewer backflow valve

Prevent damage to your home

Significant damage can happen to your home and belongings if sewage ever backs up into the house. You never know when the conditions for a sewage backup will be fulfilled. That is why you should protect your home with a sewer backflow valve.

Save your money

A sewer backflow valve protects your finances by helping you avoid the high cost of fixing damage caused by sewer backup in your home. The cost of installing a sewer backflow valve is minor compared to the cost of fixing water damage to your home.

To keep your home up-to-code

Sewer backflow valves are required by the building codes for some areas. Installing the valve ensures that your home is safe from sewage backup and helps you avoid trouble with the authorities.

Types of sewer backflow valves

There are six types of sewer backflow valves:

Horizontal 4-inch Backwater Valve

This is used in horizontal drain lines and is the most common sewer backflow valve found in homes and small commercial buildings.

Vertical / 90-degree Backwater Valve

This sewer backflow valve is best for vertical piping in tight spaces within areas with a high risk of backflow.

Horizontal Backwater Valve & Manual Gate Valve Combination

This is a compact valve that is easier to install. Its main drawback is that it cannot be repaired.

Terminal Backwater Valve

This is installed at the discharge point of a horizontal sewer line in situations where you do not need to control sewage flow.

Floor Drain and Backwater Valve Combination

As its name implies, this type of backflow valve is installed in a floor drain, usually within the basement.

Open Backwater Valve

This is used in lines with a low risk of backflow but where the sewage flow is constant.

a sewer backflow valve installation.

If your home has plumbing fixtures where the drain is at a lower level than the public sewer line, you need a sewer backflow valve.

Does your home need a sewer backflow valve?

If any of the following applies to your home, you need a sewer backflow valve:

  • If your area is prone to flooding, your home needs a sewer backflow valve in its main sewer line.
  • If your home has plumbing fixtures where the drain is at a lower level than the public sewer line, you need a sewer backflow valve.
  • You need a sewer backflow valve if your ground floor is not more than 30 cm above the street level.
  • If you have had previous cases of sewage backup in your home, you need a sewer backflow valve.

To conclude, note that you will need to get a permit before installing a sewer backflow valve in your home. Installing a sewer backflow valve is not a DIY project. Before hiring a plumber to install a sewer backflow valve in your home, ensure they are experienced and understand the unique plumbing issues of homes in your area.

Best Ways to Prevent Sewer Back Ups

Plumbing issues in the home are almost unavoidable. They are the inevitable outcome of the normal use and eventual aging of the plumbing system. Plumbing issues can happen at any time and in almost any part of the home. This is because the plumbing in your home extends throughout the house, as TE Johnson & Sons explains, so problems are not limited to just one part of the building.

Best Ways to Prevent Sewer Back Ups

Plumbing issues come in different forms. They may take place unseen behind an appliance or feature of the home. When this is the case, a plumbing problem can do secret harm and it could take some time before it is discovered. Other times, a plumbing problem is self-evident because it happens in a way that completely disrupts the normal use of the plumbing.

This second type of plumbing problem creates what is known as a plumbing emergency. These are issues that are so distressing that they must be dealt with immediately. Plumbing emergencies not only prevent the normal use of the plumbing, but they also damage the other features of your home. Sewer backups are perhaps the number one plumbing emergency in the home.

What is a sewer backup?

Sewer backups happen when the normal flow of wastewater from the home is prevented by a blocked or damaged sewer line. When a sewer line is blocked, its contents don’t flow into the municipal sewer lines as it should. Instead, it is trapped inside the pipes on your property. If those pipes become full, their content eventually starts to overflow inside your home.

A sewer backup is easily the most disgusting type of plumbing problem because it will release the gross contents of a sewer line into your home. Sewer backups are so damaging that out-of-pocket cost for fixing the problem is often between $2,000 and $10,000. But the good news is the problem can be prevented.

How to prevent sewer backups

Watch what you flush down the drain

Your home’s drainage system does not have the capacity to handle everything you throw at it. In fact, most items labeled “flushable” will create problems for the drain. The only thing you should flush down the toilet is toilet paper, not wipes, sanitary towels, disposable diapers, or feminine products. 

In the kitchen avoid putting grease, oil, fat, eggshells, potato, rice, fibrous vegetables, and coffee grounds into the drain. Also, do not let hair get into the shower drain.

Protect sewer lines from tree roots

The roots of plants and even small bushes pose a major threat to your sewer lines. The wastewater inside sewer lines provides a rich source of nutrition and tree roots will invade any place where there is water and nutrition.

sewer tree roots

If allowed to grow close to the sewer line, plant roots can puncture the pipe and eventually block it. To prevent this, don’t plant trees or bushes near sewer lines and laterals. You can also prevent tree root damage by using plastic piping.

Do not divert excess rainwater into the sewer

Diverting the water from downspouts, the sump pump, French drains, and your flood control systems into the sanitary sewer line might seem like a good idea. It feels like an easy way to prevent water pooling in your yard. But it is actually a bad idea because rainwater can overwhelm the drain and cause flooding in your home. By diverting the downspout into the sewer, you could be unintentionally channeling floodwater into your house.

Install a sewer backup valve

This serves as the last line of defense against sewer backups. The backwater valve installation will let wastewater flow out of your home into the sewer line but will prevent the sewer contents from flowing in the opposite direction. When backs happen up due to a damaged or blocked line and because of heavy rains, the valve automatically closes the channel.

Install an exterior cleanout

An exterior cleanout offers a cost-effective way to deal with sewer problems. They are often located in the yard and can be identified by their round cap. Most are made of vitreous clay pipe and installed flush with the ground.  

An external entry point to the main sewer line makes the work of cleaning sewer lines or removing blockages easier. An outside cleanout helps prevent water and pipe damage, and if a problem does happen, it cuts your repair costs since the repair is done from inside the cleanout.

Inspect and fix old pipes

The probability of sewer backup increases with damaged lateral lines. The only way to be sure your sewer line is in good condition is to have it inspected by an expert once a year. If the line is damaged, you have three options for solving the problem. Lining the pipe is an effective way to solve minimal issues with the lines. For more serious issues the next option is pipe bursting. Both pipe bursting and pipe lining do not involve excavation. But if the problem is major, the only way to solve it may be to dig up the yard and replace the sewer line.