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As required by the U.S. Department of Transportation (DOT), customers are notified that an excess flow valve (EFV), which meets the minimum DOT performance standards, is available at a typical cost from $1,429 to $2,238, paid for by the customer, for installation on your natural gas service line. Please note that such a device is not required for the normal, safe operation of your service line. An EFV can help mitigate the consequences of a service line failure (i.e. break, rupture, etc.). The installation of EFVs on new or replaced single family residence service line that operates above 10 psig has been required for the last seven years. If your service line was installed or replaced within the last seven years, it is likely it has an EFV.

The EFV is installed inside a distribution service line between the gas mainline and the gas meter (usually within 3 feet of the main). If there is a significant increase in the flow of gas (i.e. due to a damaged line), the EFV will “trip” or close to minimize the flow of gas through the line (and thus the amount of gas escaping into the atmosphere). EFVs are designed so general usage, such as turning on appliances, will not shut the valve. However, during a significant increase in the flow of gas, the valve will close and remain closed until the correct pressure is restored. When the correct pressure is restored the EFV automatically resets itself.


Safety Benefits
An EFV is a safety device installed inside the natural gas service line between the gas mainline and the gas meter to minimize the consequences of a damaged service line. The EFV is designed to automatically close if there is sufficient damage to the line to minimize the flow of gas through the line and thus, the amount of gas that escapes into the atmosphere. During normal use, the valve is kept pushed open against oncoming gas flow by a spring. EFVs are designed so that general usage, such as turning on appliances, will not shut the valve.

However, during a significant increase in the flow of gas (e.g., due to a damaged line), the spring cannot overcome the force of gas, and the valve will close and stay closed until the correct pressure is restored. When the correct pressure is restored, the EFV automatically resets itself.

Installation of an EFV
Existing service line customers who would like to have an EFV installed in your natural gas service line, can request an EFV installation by contacting NMGC at 888-664-2726. The cost associated with installing EFVs on services lines, not being newly installed or replaced, ranges from $1,429 to $2,238 and will be the responsibility of the customer.
 
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