An Excess Flow Valve or EFV, is a device that we can install on your natural gas service line. This is the line that runs from the gas main, generally located in the street, to your house/meter.
EFVs are designed to shut off, or significantly reduce, the flow of natural gas if a service line becomes damaged and that damage causes a sudden and significant increase in gas flow. When activated, the excess flow valve may prevent the buildup of natural gas and lessen the possibility of a natural gas-related safety event.
The EFVs we install are designed to meet the minimum U.S. Department of Transportation performance standards for such devices and are just one of many ways we promote pipeline safety and integrity.
EFVs are designed to minimize or stop the flow of natural gas in the event of a service line break. For example, if an excavator accidentally digs up the natural gas service line and severs the line, the EFV is designed to automatically minimize or stop the flow of natural gas reducing the risk of property damage or a natural gas-related safety event like a leak or fire.
If you would like to have an EFV installed on your service line, you will bear the cost of installation. Costs vary, but average around $1,500.
Until recently, federal law did not require excess flow valves to be installed on newly-constructed or replaced service lines. As such, if a customer wants an EFV installed on their service line, the installation is performed at the customer’s expense.
EFVs will not work properly on all natural gas service lines, for reasons such as high gas flow, low pressure, or other factors. Therefore, not all customers qualify for an EFV. If you request an EFV, but your service line cannot accommodate it, we will let you know.
No, installation of an EFV is not mandatory. If you would like an EFV installed, you may contact us at 1-800-720-8193.
We work diligently to promote pipeline safety in a variety of ways, including through inspection programs, public education, pipeline markers, facility mapping, surveys, patrolling, pressure monitoring, odorization, and liaison with public officials. EFVs are an additional means of promoting safety, however, regardless of whether a customer elects to have an EFV installed, we will continue to work to protect the safety of our customers and the communities we serve in the same manner you have come to expect.