Excess Flow Valves – An Optional Device for National Fuel Customers

Where conditions* permit their use, National Fuel can install an Excess Flow Valve (EFV) on your natural gas service line (the underground line that runs from the main line to the meter).

• EFVs are designed to shut off the flow of natural gas automatically in the rare instance that the service line breaks or is damaged. These infrequent incidents are caused, primarily, by excavation damage.
• A customer may request that National Fuel install an EFV on an existing gas service line on a mutually agreeable date, at a cost ranging from approximately $1,200 to $2,000 depending on the service size and the scope of the required installation work.
• To install, National Fuel would need to excavate the service line at its connection to the gas mainline that runs down your street. Gas service will be turned off, the EFV installed, the excavation backfilled and your appliances will be relit. In some situations, we may need to replace your entire gas service – at no additional cost.
• An EFV must be sized to operate properly under your current natural gas usage conditions. Significant future usage increases – the installation of a natural gas emergency generator or pool heater – may require the replacement of an EFV at an additional cost.
• To learn more about having an EFV installed on your gas service line, please fill out and submit the form below.

*Conditions required for the installation of an EFV

1. The service line operates at a pressure of 10 psig or greater throughout the year;
2. There are no contaminants in the gas stream that could interfere with the EFV’s operation or cause loss of service;
3. An EFV would not interfere with necessary operation or maintenance activities; and
4. An EFV meeting the performance standards in 49 CFR §192.381 is commercially available.

Excess Flow Valve Request Form

Fill out and submit the form below to learn more about having an Excess Flow Valve installed on your gas service line.