A home

Excess Flow Valves

Emergency Info

Suspect a natural gas leak?
Call 911
And Southwest Gas immediately at
whether you're our customer or not.

Si usted sospecha una
fuga de gas natural,
llame al 911
Y a Southwest gas al
Inmediato, si usted es nuestro
cliente o no.

An excess flow valve (EFV) is a device that automatically shuts off the flow of natural gas if a service line is broken. Service line damage usually results from some type of excavation or digging.

An EFV may also restrict the flow of gas if the gas meter is damaged, generally as a result of vehicle impact and, on rare occasions, from large snow loads.

The EFV is installed on the service line that runs underground between the gas main and the meter on a customer's property. Because the EFV restricts the flow of gas, it reduces the potential for fire-related property damage, personal injury, and death. Southwest Gas has installed EFVs on most residences built after June 2008.

While the valve provides enhanced safety, it’s not designed to operate in response to small leaks in the service line, nor protect against customer appliance malfunction, houseline leaks, or small punctures in the underground pipe. An EFV may not protect against damage to pipelines from earthquakes or flooding.

If you’d like a cost estimate to have an EFV installed at your residence, or if you’d like to find out if you already have an EFV, please call the Energy Specialists at 1-800-654-2765 for information.