Check Valve Or A Flapper Valve For My Sewer Drain


A check valve is a type of valve that allows fluids to flow in one direction but closes automatically to prevent flow in the opposite direction (backflow). Check valves are used in a wide variety of locations, but the focus of the discussion in this tutorial will be the installation of check valves at the steam trap outlet side.

Questions are often asked about the need and purpose of check valves, such as:

Let’s discuss these two points.

Is it always necessary to install a check valve downstream of a steam trap?

Check valves are necessary if there is a risk of condensate backflow. For example, when a trap discharges into a common condensate collection line, there is the potential risk of backflow from condensate discharged from other traps, so as a rule a check valve should be installed. Preventing this backflow is important because it can not only diminish process heating efficiency, but can also damage steam traps. In contrast, when there is a...

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Every year, as much as eighty thousand gallons of precious water can go to waste because of leaks from toilet tanks. This is why it is important to check your toilets once in a while. One of the parts that often break down is your toilet’s flapper or flush valve. This is the device inside the tank that is in charge of flushing. This mechanism is typically made of rubber, so it has the tendency to become brittle and hard over time. If this happens, the valve will not seal properly and will cause a leak. What is the first sign that you have a defective toilet tank? If you hear that the water doesn’t stop running. To check if the toilet’s flapper valve is the part that is causing the trouble, simply turn off the toilet’s water supply and indicate the level of the water on the side of the tank using a pencil. Wait for twenty minutes then check the level again. If the level has gone down, you may have to replace your flapper or flush valve. Luckily, you can easily change this part even...

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Sewer Check Valve

Homeowners in distress routinely express interest in installing a sewer check valve (also known as a backwater valve) as a solution for back ups from public sewer overflow.

At various locations across NYC the past building boom may cause the public drain system to be overburdened and not able to handle the flow of waste and rain water. Sometimes this overflow will back up through a house sewer and cause a property owner a lot of distress.

Unpredictable weather such as extremely heavy rainfall, flash floods, and even a recent hurricane have exasperated this condition. City sewer back ups now occur even more frequently. These back ups usually result in damage and expensive clean-ups. Naturally people that are affected by this condition look for a sensible sewer repair solution for this situation.

City sewer back ups affect a property owners

Basement damage from water

If the water level in a city sewer rises to a level...

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Why do I flood? Why can't I just plug my floor drain or use a stand pipe? Why can't I use just a sump pump? What is a flood control system? What is a balanced valve? What is a cast iron check or flapper valve? Why is a balanced valve better than a cast iron check valve? Isn't the overhead sewer the only foolproof solution to my flooding problems? What is a modified overhead sewer or lift station? Why should my flood control system be installed outside my building? Why should I choose Eveready Flood Control?

1. Why do I flood?

Flooding can be caused by either a problem in your sewer line or an overloaded municipal sewer system. If you flush toilets, use the washing machine or shower and water backs up into the basement on a dry day, or if water comes up during a heavy rain, but does not drain down after the city sewer recedes you probably have an obstruction in your sewer line. This is usually rectified by rodding (cleaning) the sewer line, or in...

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Check valve symbol on


The arrow shows the flow direction.

A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.[1]

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

An important concept in check valves is the cracking pressure which is the...

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First - NOT full septic tank - if that was the case you would be getting backup of sewage into the lowest drains in the house, and possible very slow flushing or refusal to drain out of the bowl - the opposite of your case.

Second - I assume you are the owner. If a renter or on a lease, this type of problem may be the responsibility of your landlord, depending on the terms of your lease or rental agreement.

OK - two possible situations here - low water in BOWL, or low water in TANK. I am assuming your toilet flushes OK, with adequate water to clean out the bowl, and that it is a typical type toilet with a tank sitting on the back of the bowl. If this is not the case and it is a designer toilet or looks like those at public restrooms (no tank), then the BOWL answers still apply if it is initially refilling OK, but if not enough refill water coming in at all then call a plumber.

First, low water in the toilet BOWL case. If the water in the toilet BOWL is low...

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