Note: A recent natural gas safety mailing included an insert with information about Excess flow Valves (EFV) that does not apply to the new LRES natural gas system. Every residential and small commercial service line on our system is equipped with an EFV.
Every residential service line on the LRES system has Excess Flow valve (EFVs) installed underground where the gas service line joins the main.
EFVs are similar to electrical circuit breakers that shut off the electricity when the current exceeds design limits. They automatically shut off the gas when the flow to a residence or commercial facility exceeds design limits. This excess in gas flow can be caused by a break in the service line from ground movement, natural disasters or third party damage.