Seismic Gas Shutoff Valves, Seismic Switches, & Valve Assemblies

CALIFORNIA (formerly Koso) Seismic Gas Shutoff Valves
Model 400 Seismic Three-Way Valve
Model 501 Remote Actuator
Model 510 Seismic Switch
Model MS Monitoring Switch
Seismic Shutdown Systems Questionnaire
Best New Product Award, 1997 Western Plant/Facility Engineering & Maintenance Show. Click photo for larger image.
Help protect lives and property from gas fires and explosions caused by earthquakes by installing a CALIFORNIA (formerly Koso) Seismic Gas Shutoff Valve on your structure's natural gas or vaporous propane line. CALIFORNIA Valves are UL listed, California certified, and Los Angeles approved. Fifty four models are available in the following sizes: 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 4", 6", and 8"; and three orientations: horizontal, vertical top-in, and vertical bottom-in. Properly installed valves satisfy the regulations of Los Angeles, Santa Monica, and West Hollywood requiring a seismic gas shutoff valve on new construction, certain remodeled buildings, and ownership transfers; as well as similar regulations adopted by other jurisdictions in California, Washington, and elsewhere.

Click photo for 510 brochure

Model 510 Seismic Switch incorporates the seismic trigger mechanism used in CALIFORNIA Valves, and can be used to control doors, pumps, generators, machinery, and solenoid valves or electrical valve assemblies installed in gas or fluid lines.



Model 400 Seismic Three-Way Valve also includes the seismic trigger mechanism found in CALIFORNIA Valves, and is used to control 80-psi, dry-nitrogen lines that control pneumatic valve assemblies installed in specialty gas or fluid lines.



Model 501 Remote Actuator is an optional factory-mounted device that can trigger a seismic valve, seismic switch, or seismic three-way valve when activated by a panic button, gas sensor, or fire alarm.



We supply Electrical, Electro-pneumatic, and Pneumatic Valve Assemblies compatible with Model 510 Seismic Switch or Model 400 Seismic Three-Way Valve, and suitable for use in lines carrying various gases or fluids over a wide range of temperatures and pressures.


Model MS Monitoring Switch Click photo for MS brochure

Model MS Monitoring Switch is an optional factory-mounted device for any model of CALIFORNIA Valve, which is available at the time of order. Model MS relays an electrical signal that can be used to remotely monitor the valve's open/closed position via a signal cable connected to a PLC, PC, or alarm system. It does not interfere with the valve's visual position-indicator window with the green and red tags. Model MS uses a 24-VAC or 24-VDC current, and relays a 250-mA current that can indicate whether the CALIFORNIA Valve is open or closed.