What are Excess Flow Valves? According to the U.S Department of Transportation Pipeline and Hazardous Materials Safety Administration:
Excess Flow Valves (EFVs) are safety devices installed on natural gas distribution pipelines to reduce the risk of accidents. They are designed to shut off the flow of gas in the event of an accident such excavation damage or an earthquake. They are not designed to shut off the flow of gas for small leaks or if the leak occurs beyond the gas meter (such as on house piping or appliances).
EFVs are required for new or replaced gas service lines servicing single-family residences (SFR), as that phrase is defined in 49 CFR 192.383(a). Following the investigation of a natural gas explosion in Loudon County, Virginia, in 1998, the National Transportation Safety Board (NTSB) recommended (Recommendation P-01-002) that PHMSA require that excess flow valves be installed in all new and renewed gas service lines, regardless of a customer’s classification, when the operating conditions are compatible with readily available valves.
In a Final Rule published in the Federal Register on October 14, 2016, PHMSA made changes to 49 CFR Part 192 to expand the requirement for EFVs, to include new or replaced branched service lines servicing SFRs, multifamily residences, and small commercial entities consuming gas volumes not exceeding 1,000 standard cubic feet per hour (SCFH). PHMSA also amended Part 192 to require the use of either manual service line shut-off valves (e.g., curb valves) or EFVs, if appropriate, for new or replaced service lines with meter capacities exceeding 1,000 SCFH. This final rule also requires operators to notify customers of their right to request installation of EFVs on service lines that are not being newly installed or replaced. This final rule, entitled “Expanding the Use of Excess Flow Valves in Gas Distribution Systems to Applications Other Than Single-Family Residences”, is effective April 14, 2017.
Any existing customers who currently do not have an EFV may contact the main office at 642-5635 in order to schedule an estimate. The home owner is responsible for the cost of installing an EFV into an existing residence.