Excess Flow Valve Information

Excess Flow Valve ( EFV) Customer Notification (Pipeline Safety Regulations 192.383)

Beginning April 14, 2017, Hartselle Utilities will notify existing customers about excess flow valves (EFV) and install per customer request on natural gas service lines not exceeding 1,000 SCFH (standard cubic feet per hour). Notifications will be electronic and print, via HU website and Main Office.

 Potential Benefits

An EFV is designed to shut off the flow of gas in an event where the gas flow exceeds a set rate. For example, the EFV will activate if the service line is damaged by excavation. Stopping the flow of gas from a damaged service line significantly reduces the risk of natural gas fire, explosion, personal injury, and property damage.


Industry experience is that EFV’s rarely malfunction. Replacement may be necessary in the event that the EFV malfunctions or by adding large consumption appliances such as back-up generators.


Installation costs will vary depending upon such factors as service length, pipe size, and location. ($500.00 minimum, or Actual Cost (materials + labor) if exceeding minimum). All work will have an estimated cost prepared; the estimate will be prepaid by the property owner before work begins.

Additional Information

EFV installation may not be possible due to certain factors. Hartselle Utilities will inform you if installation is not possible due to these factors.  Hartselle Utilities’ provides no express warranty for continued proper EFV operation.

Installation of an Excess Flow Valve is not mandatory for existing service lines