Seismic shut-off valves respond specifically to ground motion and earthquake activity. They use internal mechanisms like pendulums or ball bearings that trigger when earthquake shaking reaches a predetermined intensity, typically 5.1 magnitude or higher. These are designed specifically for earthquake preparedness and seismic safety.
Excess flow valves detect sudden increases in gas flow rate, which can indicate pipe ruptures, major leaks, or equipment damage from various causes. They’re triggered by flow changes rather than ground motion, making them effective for different types of gas line emergencies beyond earthquakes.
Many California properties benefit from both types of protection. Seismic valves handle earthquake-specific risks, while excess flow valves provide broader leak protection from construction damage, vehicle impacts, or other incidents. We can evaluate which combination offers the best protection for your specific Kings Beach property and risk factors.