FAQ

What is an excess flow valve?

An excess flow valve (EFV) is a safety device installed by Atmos Energy inside a service line as near as practical to the gas main that is located in your street, alley or easement. EFVs are designed to shut off, or significantly reduce the flow of natural gas if a service line is broken or severed. EFVs are not required for the normal, safe operation of your service line, but could help mitigate the consequences of a service line break.

Will an excess flow valve stop or reduce the flow of natural gas to my house?

An EFV does not protect against leaks on customer house piping or appliances. If you smell gas or suspect a gas leak inside your home, LEAVE THE AREA IMMEDIATELY. Then call 911 and Atmos Energy's emergency line at 866.332.8667.

Can an excess flow valve be installed at my house or business?

An EFV can only be installed when certain operating conditions are met. If one or more of the following conditions are present, as determined by Atmos Energy, your service line may not be eligible for the installation of an EFV.

• Your service line does not operate at a pressure of 5 psig or greater throughout the year. 
• Atmos Energy has determined that there are contaminants in the gas stream that could interfere with the EFV's operation or cause loss of service. 
• An EFV could interfere with necessary operation or maintenance activities. 
• Your gas load exceeds 1,000 SCFH (Standard Cubic Feet per Hour).

If none of these conditions are present, Atmos Energy will install an excess flow valve in your service line on a date mutually agreed to by you and Atmos Energy.

To begin the process to determine if you are eligible to have an EFV installed, call our Customer Contact Center at 888.286.6700 during business hours (Monday – Friday, 7am – 6pm CST).

Who will pay for and install the excess flow valve?

If your service line meets the requirements for the installation of an EFV, Atmos Energy will set up a mutually agreeable date with you for installation. The customer may be responsible for paying the cost of installation.

How long does an excess flow valve last and are there any maintenance or replacement costs?

An EFV is designed to last the lifetime of our distribution system. Atmos Energy will maintain the EFV after installation and customers are not required to pay future maintenance or replacement costs associated with an EFV.