Home Improvement

What is a Flood Protection Valve?

Flood control systems are used to decrease the danger of damage to a home or basement due to flooding in a residential area. In other cases, flooding is caused by basement fissures, floor drains or flooring, a clogged catch basin, or even worse, the sewer connection.

Anti-flood valves are an effective way to avoid backflow, which may cause severe damage to pipes. An anti-flood valve is used to halt the reverse flow of sewage and wastewater from the drainage network in the case of a flood.

Canitec will discuss “what is flood protection valve” on this blog.

A flood protection valve is a kind of valve which helps to prevent floodwater enter your house from different sources.

In your main water supply lines, a backflow preventer valve is meant to keep water from flowing in the other way. From the main water supply pipes, the valve will deliver sanitary water to the water lines under your foundation.

Flood Prevention Strategy by Using Anti-Backflow Valves

A backflow prevention system is a wonderful technique to avoid basement flooding. The valves prevent sewage water from coming back into your house when it is higher in the sewer. Read this blog to learn how to flood-proof your home.

When a backflow preventer is installed, it seals off the plumbing outlets in your home so that water from municipal drains can’t enter the system.

Water from the public drainage system can back up into your home during a flood, clogging drains, showerheads, toilets, and tubs. An excellent technique to avoid floods, but not enough on its own, according to the author.

Types of Anti-Backflow Valves

As a result of flooding, drains might be overrun by stormwater, which can cause a backflow in the drainage system. There is just one flap on the drain non-return valve, preventing water from backing up into the drain pipe and flooding your home.

Retro-fit and In-Line are the two types of anti-backflow valves.


Retro-fitting is a method of modifying an existing system.

Non-return valves can be retro fitted into the pipe going to the inspection chamber or the drain pipe to guard against backflow. Retro-fit drain non-return valves include the following:

  1. This is a non-return Buffalo 110mm valve.
  2. Buffalo Non-Return Valve 150mm Diameter.


Install a non-return valve if you can’t discover the inspection chamber outside your home. To cut these pipes, a hole must first be excavated before the pipe can be cut.

Where to Install an Anti-Backflow Valve?

Inspection Chamber

As every property is connected to the drainage system, there is an inspection chamber located outside of your home. Council can examine drains without having to get entry to your house.

At the bottom, the inspection chamber can be 450mm wide. The inspection chamber can be up to 3m in length, although most are within easy reach (12-18 inches below ground level).

You will need to remove a maintenance hole cover to reach the drain pipe.

  • Not return valve Buffalo 110mm
  • 150mm Non return valve Buffalo

At The End of the Pipe

It’s possible that you need a non-return valve on a drainage pipe running to a pond, stream, or river. In this case, you can add a non-return valve at the pipe’s terminus.


  • Valve Capricorn -Non-Return
  • Not return valve Buffalo 110mm

You can build a new chamber outside your residence:

Where your drains join, the drainage system will need to be mapped out if you cannot locate an inspection chamber or the end of the drain pipe. As soon as you’ve discovered the pipe, contact a drainage professional to consider installing a non-return valve.

How Does a Non-return Valve Work that Prevents Backflow?

Alternatively, the non-return valve can be placed into the inspection chamber’s foul pipe via the foul pipe. This is a single-flap valve with a flap that is usually in its closed position. An automatic flap opens and closes as soon as the water pressure is released, indicating that the property is no longer submerged.

Water might back up owing to blocked drains when the valve is stopped in an emergency situation. A stainless-steel flap also prevents rats from entering the sewers.

Size of Anti-backflow Valves

This will depend on the sort of property that is connected to the drainage system, as well as its size. The usual drain-pipe diameters are:

  • For Residential properties – 110mm
  • For Commercial properties – 150mm

Re-setting the Valve After Use

In order to reactivate your backflow valve, it must be reset. It’s possible that your home won’t be inundated by water flowing in, but you may create a small flood by utilizing water that can’t escape. As a result, emptying a bathtub or taking a long shower might result in an interior deluge instead of the desired effect.

Use of the Alarm

Flood protection systems can warn homeowners when a water valve has been activated and has to be repaired before regular water consumption can resume.

An alarm box placed in your home is powered by batteries and is connected to each valve’s cap via wire. The alarm sounds whenever the backwater valve is activated, alerting you to the situation.


A comprehensive flood prevention system is worth your time if you reside in an area susceptible to flooding. This generally consists of the following elements:

Anywhere outlets are below ground level, or there is a risk of water entering, backflow protection valves should be installed.

Backflow valves capture excess water, preventing it from accumulating around your foundation.

To let you know when the backwater valves need your attention, sirens are installed on the backwater valves.

Floodwaters expelled by the sump pump can be dispersed in a different way using this alternate dispersion point.

If your house is particularly prone to flooding, the cost of installing a flood protection system may be mitigated by reduced insurance rates and fewer deductibles. So, think deeply before taking any decision!