12793 Amerex 1.5 Mechanical Gas Valve - OEM
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Wholesale PricingThe Amerex 1.5" Mechanical Gas Valve (Part No. 12793) is a heavy-duty, brass shut-off component engineered for the Amerex KP (Kitchen Protection) and Zone Defense (ZD) systems. Serving as the primary source isolation point for medium-to-large kitchens, this valve is optimized for high-BTU appliance lines where maintaining high gas volume is critical. By immediately terminating the fuel supply upon system discharge, the 12793 effectively removes the fuel leg of the fire triangle, preventing re-flash in the hazard zone.
Operating on a normally closed kinematics principle, the 12793 is held open by a precision-engineered latch and cable tension. When the MRM triggers, the tension is released and a high-tension internal spring slams the valve disc into the seat. This purely mechanical design ensures the valve functions during power outages. Every 12793 is shipped with the Gas Trip Assembly (P/N 12740), ensuring a standardized interface for high-volume header distribution serving industrial-scale charbroilers and fryer batteries.
| Feature | Details |
|---|---|
| Manufacturer | Amerex Corporation |
| Part Number | 12793 |
| Pipe Diameter | 1.5-inch (1-1/2") NPT |
| Valve Type | Mechanical / Normally Closed |
| Material | Rugged Brass / Stainless Internals |
| Pressure Rating | 10 PSIG (69 kPa) |
| Included Hardware | Gas Trip Assembly (P/N 12740) |
The 12793 must be installed by a licensed fire suppression technician in accordance with the Amerex KP or ZD system design manual and applicable local gas codes. The included Gas Trip Assembly (P/N 12740) provides the standardized mechanical interface between the 1/16" control cable and the valve latch, preventing the use of field-fabricated components. Cable tension must be set to factory specifications to ensure the valve latch holds the valve fully open during normal operation.
Due to its rugged brass casting, the 12793 is significantly heavier than smaller appliance-level valves. The 1.5-inch NPT piping must be securely supported with appropriate hangers on both sides of the valve to prevent mechanical stress on the manifold. After installation, the technician must verify full valve travel by performing a manual trip test and confirming positive gas shutoff before the system is placed in service. Once tripped, the valve requires a manual reset by a certified technician before the system can be re-armed.
Why is 1.5" considered the "Sweet Spot" for commercial kitchen lines?
The 1.5-inch NPT size is the most common diameter for main gas headers that supply a standard 10-foot to 15-foot cooking line. It provides sufficient volume for multiple heavy-duty appliances without the unnecessary weight and cost of an industrial 2-inch valve, ensuring high-volume header distribution without pressure drops.
What is the purpose of the included 12740 Gas Trip Assembly?
The 12740 Gas Trip Assembly provides the standardized mechanical interface between the 1/16" control cable and the valve latch. Including this hardware with the 12793 prevents the use of field-fabricated components, ensuring that the kinematic release of the valve remains consistent and compliant with UL 300 standards.
Does this valve support higher pressures than smaller models?
Yes. While many smaller appliance-level valves are rated for 5 PSI, the 12793 is rated for up to 10 PSIG. This makes it suitable for facilities with higher-pressure gas service where it must manage the fuel load for high-BTU appliance lines without leaking.
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