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Excess Flow Valve (EFV)


In accordance with the Code of Federal Regulation 49 CFR 192.383(e), Trussville Gas and Water is notifying its customers of their right to request an Excess Flow Valve (EFV), on the existing service lines currently supplying natural gas to homes or businesses.

Potential Benefits of EFVs:

Customers may request that Trussville Gas & Water install an Excess Flow Valve (EFV) on the gas line to an existing property. EFVs are mechanical shut-off devices that can be installed on the gas pipe (service line) running to the gas meter on a property. An EFV is designed to stop the flow of natural gas if the service line is broken by an excavation accident between the gas main and the meter. Stopping the flow of gas from a broken service line significantly reduces the risk of a natural gas fire, explosion, personal injury and/or property damage.

EFV Installation Cost:

Trussville Gas & Water customers who desire to have an EFV installed on existing service lines will be billed for the cost of the installation. The cost will be calculated based on our current labor, material, and equipment rates not to exceed $750.00. The EFV will be installed on a mutually agreed upon date.

The property will be required to meet one of the following criteria:

  • Property serves a single family residence.
  • Property serves a multifamily residence or single, small commercial business by a single service line with a known usage not exceeding 1,000 standard cubic feet per hour per service based on the existing meter capacity.

EFV Maintenance:

If it becomes necessary to maintain or replace the EFV on the customer’s service line, the customer will be billed for any maintenance and/or replacement cost at the time the work is performed. Cost to the customer will be calculated based on current labor, material, and equipment rates.

EFV Exceptions:

EFVs cannot be installed on some service lines due to high gas flow, low pressure or other factors. If an EFV is requested, Trussville Gas & Water will inform the customer if the service line cannot accommodate an EFV.

The installation of the EFV is not mandatory on existing service lines to a customer’s home or business.

Please direct any requests for EFV installation or questions about EFVs to our customer service department at 205-655-3211.

EFV Diagram:

Excess Flow Valve