Excess Flow Valves
What you need to know about excess flow valves
As part of our commitment to safety, we wanted to let you know you have the right to request that an Excess Flow Valve — commonly called an EFV — be added to your existing gas service line.
What’s an EFV?
An EFV is a device that’s designed to automatically shut off the flow of natural gas if a service line ruptures or breaks.
Where is it installed?
The EFV is installed on the service pipeline that runs underground between the gas main and the Black Hills Energy meter on your property.
How does it work?
Because the EFV restricts the flow of gas when the service line ruptures or breaks, it helps reduce the chance of natural gas-related property damage and injury.
Installing an EFV doesn’t protect against leaks that might happen in your house or small punctures in the pipe or meter. An EFV doesn’t shut off the flow of gas completely, so some gas could still leak if a pipe or meter’s damaged.
Do I have an EFV?
We’ve installed EFVs on most new or replaced services lines built since 2008. If you want to find out if you already have an EFV, call us at 888-890-5554.
How do I have an EFV installed?
If you’d like to have an EFV installed, call us at 888-890-5554. Depending on the regulatory rules in your state or our approved operating terms and conditions, you may be responsible for the cost of installing the EFV. The average cost is $1,000 but varies by difficulty of installation. We can provide a cost estimate at your request. Installation requires Dig Safe notification and excavation where the existing gas service line connects to the gas distribution main. During installation, your gas service will be interrupted. EFVs don’t work on all gas service lines, and there may be certain situations where you won’t need an EFV. If you decide you’d like an EFV and are eligible for one, we’ll install the device on a mutually agreeable date.
For more information, call us at 888-890-5554.
Benefits of an EFV
If a meter is damaged during a car crash or similar accident, an EFV will significantly reduce the flow of gas. This can reduce the chance of natural gas-related damage or injury.
More commonly, an EFV restricts gas flow when an excavator accidentally hits a service line. Although an EFV may limit the damage caused by such an incident, the best way to prevent one is to make sure those who are digging on your property call 811.