Excess Flow Valve

Excess Flow Valve

Mountaineer Gas Company (Mountaineer) provides and maintains safety measures that protect your home and neighborhoods from unexpected changes in natural gas flows. One of those measures is an Excess Flow Valve (EFV) installed on new and renewed gas lines that supply gas to homes and some businesses. The device is designed to automatically shut off the flow of gas to your home if the natural gas line is damaged or broken.

As Mountaineer installs new gas pipelines throughout the system as part of our pipeline improvement program, EFVs are installed on service lines that meet the operating conditions for an EFV. Mountaineer must install an EFV at a mutually agreeable date if the customer is eligible for an EFV. Customers that may be eligible for EFV installation include those whose service lines:

  • Have a meter load that does not exceed 1,000 SCFH (standard cubic feet per hour: 1000 SCFH = 1 MCFH) as determined by Mountaineer.
  • Operate at a pressure of 10 PSIG (pounds per square inch) or greater throughout the year (a high pressure line may be indicated by additional devices (regulators) attached immediately adjacent to a customer’s meter).
  • Will not have experienced problems with water or other contaminants in the service line.
  • Where installation of the EFV will not interfere with required operations or maintenance activities.

If the customer requests installation of the EFV and Mountaineer has not scheduled the location for a service line replacement or a new service line, or the customer requests the installation prior to the Mountaineer’s scheduled installation time, the customer shall be responsible for the estimated cost of the materials and installation to be paid prior to installation. Customers that request to have an EFV installed will be responsible for the cost of installation with estimates beginning at $1,000. If you would like to learn more or request information to determine if your service line is suitable for an EFV installation, please call our customer service representatives at 1-800-834-2070.