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Excess Flow Valve (EFV)

In accordance with recent federal pipeline safety regulations Title 49 CFR 192.383 (e) LCGD is required to notify all natural gas customers of the new excess flow valve (EFV) requirements. Effective April 14, 2017 EFV installation requirements are expanded to include new or replaced service lines to single family residences, mutifamily residences, small commercial customers with natural gas volumes not exceeding 1,000 standard cubic feet per hour. Existing customers also have the right to request the installation of an EFV on their service line if it meets the specified conditions per the final rule.

What is an Excess Flow Valve (EFV)?

An EFV is a mechanical shut-off device installed in the service line designed to stop the flow of natural gas in the event that the service line is cut, torn apart or otherwise separated, typically caused by some type of excavation or digging downstream of the EFV. Stopping the flow of natural gas from a broken service line significantly reduces the risk of a natural gas fire, explosion, personal injury or property damage. EFV’s are installed on the service line near the connection to the natural gas main.

What won’t an Excess Flow Valve (EFV) do?

  • EFV’s are not designed to close if a leak occurs after the gas meter (on house piping or appliances).
  • EFV’s also may not close if the leak on the service line is small.
  • If you add additional gas appliances after the EFV installation, for example, a pool heater, emergency generator, etc., the additional gas flow may cause the EFV to close.

What conditions allow for the installation of a Excess Flow Valve (EFV)?

  • EFV’s can be installed on service lines to single family residences, multifamily residences or small commercial customers with gas volumes not exceeding 1,000 standard cubic feet per hour and at a pressure not less than 10 psig.

What conditions do NOT allow for the installation of a Excess Flow Valve (EFV)?

  • EFV’s will not be installed on your service line if:
    • The service line does not operate at a pressure of 10 psig or greater though-out the year.
    • If LCGD has prior experience with contaminants in the gas stream that could interfere with the EFV’s operation or cause loss of service to a customer.
    • An EFV could interfere with necessary operation or maintenance activities, or
    • An EFV meeting the performance standards in 192.381 is not commercially available to the operator.

Can I request an Excess Flow Valve?

If you have a natural gas service line which was installed prior to the development of EFV’s, you may request that LCGD install an excess flow valve on the gas line to your property by calling our office number (205) 695-9320. If you notify us that you want an EFV we will determine if your line meets the conditions required for the EFV installation. Because the service line must be excavated to install an EFV,  you will be charged for this service.  The cost of installation varies depending on the complexity of the installation for existing service lines; The cost of a EFV is your responsibility. Residential costs are likely to exceed $500, and Commercial costs likely to exceed $1000.


Quick Contact Info

Office Phone:
(205) 695-9320

Office Address:
44323 Hwy 17
Vernon, AL 35592

Mailing Address:
P.O Box 572
Vernon, AL 35592

Office Hours:
Mon, Tue, Thu, Fri: 8am – 4pm
Wed: 8am – 12pm