Seismic Gas Shut Off Valves
Seismic gas shut off valves are an essential component of effective gas safety programs.
Natural Gas Safety planning with Seismic Gas Shut Off Valves (SGSOV), also known as earthquake valves, is a simple but effective way to ensure you never experience a gas fire after an earthquake. Seismic gas shut off valves are designed for earthquakes, accidents and other events of impact. MBS Engineering has installed thousands of automatic gas shut off valves to the manufacturer’s specification throughout the state of California. Need a seismic shut off valve installed at your facility? We're here to help - give us a call at (925) 334-7200.
Frequently Asked Questions
Why does my facility need Seismic Gas Valves?
The threat of earthquakes in the state of California is constant. When an earthquake hits, they can cause large scale damage to structures and property, including to the natural gas lines feeding these structures. Breaks in natural gas lines during earthquakes are very common, and can lead to fires or even explosions that are more damaging than the earthquake itself. With a seismic gas shut off Valve installed, these fires and explosions can be easily prevented in the event of an earthquake.
Where are they typically located at a facility?
Seismic Shut Off Valves are typically located on the customer side of the utility meter set. For large facilities they can also be located on branch lines or at building connections.
How they work?
Seismic gas shut off valves are installed downstream of the utility gas meter set for a gas line entering a facility or residence. They are actuated by motion of earthquakes, accidents and other events of impacts. The design is very simple, and the valves will automatically shut off the flow of gas in the event of seismic activity that is magnitude 5.4 and larger.
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Whether your property requires the installation of 1 or 100 seismic gas shut off valves, MBS has the experience, knowledge, and team of experts to manage the installation process from start to finish, no matter how simple or complex the project.
Handy Resources to Start Your Seismic Gas Shut Off Valve Project
We can quickly provide you with an estimate to install commercial and residential seismic gas shut off valves - all we need are photos of your gas meters to get started. We created these simple "How to Guides" to make taking and submitting your photos as easy as possible.
Smell Gas? Leave the area and call 911.
Then call our 24 Response Hotline at
Remember, your gas provider will only fix UPSTREAM gas systems.
MBS detects, inspects and repairs all DOWNSTREAM gas systems.
The Seismic Gas Shut Off Valves We Trust
Earthquake valves, or seismic gas shut off valves, are used as a safety device to shut off natural gas lines in the event of an earthquake. They generally are installed on the exterior of a residence or business in order to stop gas ﬂow when an earthquake of significant magnitude transpires. This will decrease the chances of a ﬁre or explosion and prevent damage to structures. The following valves are available in sizes from ¾” up to 8”. Models differ based on the orientation in which you will install them (horizontal, vertical up, vertical, down).
Paciﬁc Seismic Products, Earthquake Valves
Little Firefighter Earthquake Valves
The “California Valve” manufactured by Paciﬁc Seismic Products (formerly Koso) includes the most complete line of mechanical earthquake valves on the market today. Valves are offered in multiple orientations (horizontal, vertical up, vertical, down), sizes (3/4 through 8”) and pressure classes (7 psig and 60 psig max). All valves are UL certified, approved by the State of California and are manufactured in accordance with ASCE 25-06. MBS Engineering's trained team are experts in installing these types of automatic gas shut off valves in commercial and residential buildings.
The Little Firefighter Automatic Shut Off Valve is the most lightweight and compact valve sold on the market. Automatically shuts off gas when triggered by a significant seismic event. Easy 1/8 turn of coin slot for emergency manual shut-off. Valves are offered in multiple orientations (horizontal and vertical top inlet), sizes (3/4 through 4”) and pressure classes (2, 5, 10 and 60 psig max). All valves are CSA certified, approved by the State of California and are manufactured in accordance with ASCE 25-06.
When it comes to buying a seismic gas shut off valve, keep the following in mind...
- Price: The cost of the valve is going to vary based on the type and size of the valve, as well as the installation requirements and the company installing it.
- Choosing a valve: In order to choose the right valve size and manufacturer, contact your local Department of Building and Safety to find out their earthquake valve requirements.
- Where to buy a valve: You can purchase a earthquake or excess-flow valve at supply retailers, licensed plumbing contractors, or directly from the valve manufacturer.
- Using a contractor: You can hire a qualified professional to install the earthquake or excess-flow valve on your residential or commercial gas line. Your local utility company will not install an earthquake valve or excess-flow valve for you.