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Excess Gas Flow Valves

​Excess Flow Valves automatically shut off the gas to your building when there is a break in the line.

Excess Flow Valves contain a float which is held back from blocking gas supply by the back pressure that normally builds up in a line from normal use. When a line breaks in the building somewhere downline of the valve, the gas flows quickly and the pipe loses the back pressure which has been holding the valve float back. The valve float moves up to block the line and cut off the supply of gas. Once the line is fixed, back pressure is restored and the valve automatically opens again.
Many jurisdictions in California require installation of excess flow valves to be installed in houses and buildings that are being sold, newly constructed or remodeled. Insurance companies support and recognize the value added protection to the homeowner and many of them offer sizeable discounts for installing these gas safety valves.

Excess Flow Valves are activated by the unrestricted flow of gas, resulting from a break or rupture in the gas line. This flow causes the valve to trip or shut down. The flow of gas is then automatically reset once the gas piping has been repaired.

​​Excess Flow Valves contain a float which is held back from blocking gas supply by the back pressure that normally builds up in a line from normal use. When a line breaks in the building somewhere downline of the valve, the gas flows quickly and the pipe loses the back pressure which has been holding the valve float back. The valve float moves up to block the line and cut off the supply of gas. Once the line is fixed, back pressure is restored and the valve automatically opens again.
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Cutaway view of an excess flow valve

Difference Excess Flow And Siesmic Shut-Off Valve

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MBS Engineering, Inc
License #990872

12855 Alcosta Blvd.
San Ramon, CA 94583, USA
Phone (925) 334-7200
info@mbs.engineering
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  • Home
  • Services
    • Asphalt & Concrete Services
    • Gas Leak Detection & Repair >
      • Gas System Survey
      • Gas Pressure Regulators
      • Excess Gas Flow Valves
      • Leak Detection Technology
      • Natural Gas Leak Survey Glossary
    • Excavation, Trenching, Grading >
      • Excavation
    • Plumbing Services
    • Seismic Shut-Off Valve Installation
    • Private Power Generation >
      • Cogeneration or Combined Heat And Power
    • New Construction & Re-Piping >
      • Horizontal Drilling Or Directional Drilling And Directional Boring
      • Gas Bypass Line Construction
    • Custom Fabrication
    • Gas Line Maintenance
  • Regions
    • San Francisco Bay
    • Northern California
    • California Central Valley
    • California Central Coast
    • Greater Los Angeles
    • San Diego
  • Industries
    • Hotels
    • Hospitals
    • Colleges
    • K-12 Schools
    • JPAs And Insurers
    • Commercial Segments >
      • General Commercial
      • Municipal And Infrastructure Gas System Construction And Maintenance
      • Federal And Defense Gas System Construction And Maintenance
  • Resources
    • Library
    • Graphics >
      • Gas Safety Response Flow Chart
      • Gas Turbines
      • Problems With Older Gas Systems
      • How To Spot A Gas Leak
      • What Is A Seismic Shut-Off Valve?
      • How Does Natural Gas Get To Us?
      • Natural Gas Basics
      • Exercising Your Valves
      • The Road To Gas Safety
      • Sustainable Energy Comparison Chart
    • Natural Gas Free eBooks >
      • Are You Liable For A Gas Accident On Your Property?
      • Earthquakes And Natural Gas Fires
      • Natural Gas And School Safety
      • The Coming California Energy Shortage
      • JPA And Insurer eBook
  • Contact
    • Careers
    • Photo Gallery
    • Blog
    • MBS In The News
    • About MBS Engineering
    • Line Card
  • Events