Maxitrol M520B-1/2 1/2" NPT Modulating Gas Valve Set-Low Fire

The Maxitrol M520B-1/2 is a precision 1/2-inch NPT modulating gas valve designed for use in Selectra electronic gas flame modulating systems. This valve provides precise, non-fluctuating, instantaneous temperature control for indirect fired atmospheric burner applications without requiring a motor or mechanically driven butterfly valve.

Key Features:

• 1/2-inch NPT threaded connections for secure installation
• Low-fire adjustment capability on both sides of the valve
• Maximum inlet pressure rating of 0.5 PSI
• Maximum outlet pressure of 7 inches water column
• Operating temperature range: -40°F to 125°F
• Maximum current draw of 0.5 amps
• No external mechanical activation required

This modulating valve is engineered specifically for indirect fired atmospheric burner applications and works as part of the Maxitrol Selectra system to maintain consistent temperatures in stabilized area heating, elevated heating, baking/drying operations, and other process applications. The valve is suitable for use with natural gas, manufactured gas, mixed gas, liquefied petroleum, and LP gas-air mixtures. Compatible with Maxitrol Series 14, 24, 44, 94, SC11, and DFM control systems.