12791 Amerex 1" Mechanical Gas Valve - OEM
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Wholesale PricingThe Amerex 12791 is a 1-inch brass-body mechanical gas valve specifically designed for Amerex KP and Zone Defense kitchen fire suppression systems. It uses a pull-to-close latch mechanism — under normal operation the valve is held open by a latch, and when the suppression system activates, a trip cable from the release module pulls the latch to close the valve via an internal spring, shutting off the gas supply automatically and safely. This gas shut off valve for range applications is UL listed for both natural gas and LP gas service, covering the two fuel types found in commercial kitchen installations.
The Amerex 12791 is the 1-inch companion to the 12790 (3/4-inch) and 12792 (1-1/4-inch) mechanical gas valves — together covering the three most common gas supply line sizes for commercial kitchen cooking equipment. Per NFPA 96, an automatic gas shutoff valve is required for all gas-fueled appliances protected by a kitchen fire suppression system. The mechanical pull-to-close design of the 12791 requires no electrical power to actuate — the spring closure mechanism operates entirely via the mechanical cable from the KP system's MRM or PRM release module, making it inherently fail-safe during power outages.
For fire protection contractors completing Amerex KP system installations, keeping all three gas valve sizes (12790, 12791, and 12792) in inventory as part of your amerex fire suppression system parts supply ensures the correct gas range shut off valve is available for any commercial kitchen gas line size encountered. The gas safety shut off valve must be tested at every semi-annual NFPA 17A and NFPA 96 inspection — triggering a simulated system discharge and confirming the valve closes fully and the manual reset functions correctly. Identify the gas shut off valve location with gas shut off signage per code.
| Feature | Details |
|---|---|
| Manufacturer | Amerex Corporation |
| Part Number | 12791 |
| Pipe Size | 1 inch |
| Body Material | Brass |
| Mechanism | Pull-to-close mechanical latch with spring closure |
| Compatible Systems | Amerex KP and Zone Defense kitchen fire suppression |
| Gas Type | Natural gas and LP gas (UL listed) |
| Certifications | UL Listed, NFPA 96, OEM Original |
Amerex Mechanical Gas Valve Series
| Part No. | Pipe Size | Application |
|---|---|---|
| 12790 | 3/4 inch | Small single-appliance configurations |
| 12791 | 1 inch | Standard single or multi-appliance |
| 12792 | 1-1/4 inch | Larger multi-appliance configurations |
Placement and Gas Code Compliance
Install the 12791 in the 1-inch gas supply line upstream of all protected cooking appliances per NFPA 96 and local gas code. The mechanical gas valve must be accessible for manual reset after system discharge. Comply with the commercial kitchen gas shut off valve placement requirements in the amerex kp system manual and verify local gas code acceptance of pull-to-close mechanical valves at your installation jurisdiction. Identify the valve location with gas shut off signage.
Trip Cable Routing
Connect the 12791 trip cable to the Amerex MRM or PRM release module per the amerex kp system manual cable routing specifications. Maximum cable run lengths apply — verify the routing distance is within the approved specification before finalizing valve placement. The gas safety shut off valve must close fully within the required time after cable release during commissioning testing.
Semi-Annual Inspection
Test the 12791 at every semi-annual NFPA 17A and NFPA 96 inspection by simulating a system discharge and confirming the gas safety valve shut off closes completely. Verify the manual reset functions correctly after the test. A valve that fails to close or reset is an immediate red-tag deficiency. Document in the fire suppression system inspection record.
What is the difference between a mechanical gas valve and an electric gas valve?
The Amerex 12791 mechanical gas valve closes via a spring mechanism triggered by a pull cable — it requires no electrical power to actuate. An electric gas valve (like those used in some Pyro-Chem and ANSUL configurations) uses an electric solenoid to close the valve on a power signal. The mechanical design of the 12791 is inherently fail-safe during power outages, making it the preferred gas valve type for Amerex KP kitchen fire suppression systems where electrical integration is not required or available.
Can the 12791 be used on a Pyro-Chem or ANSUL system?
The 12791 is listed specifically for Amerex KP and Zone Defense systems. While the pull-to-close mechanical principle is similar across brands, the trip cable geometry, latch mechanism, and UL listing are system-specific. For Pyro-Chem systems, use the appropriate Pyro-Chem GV-series gas valve. Always match the gas valve to the system manufacturer per amerex fire suppression system parts documentation.
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