Description
The Maxitrol M620B-1 is a precision-engineered modulating gas valve designed specifically for atmospheric burner applications. Featuring a 1-inch NPT connection and a maximum inlet pressure of 1/2 PSI, this valve delivers reliable, stepless modulation to match burner output with heating demand — improving efficiency and extending equipment life.
A standout feature of the M620B-1 is its dual-side low fire adjustment, with both sides of the valve fitted for low fire setting. This design provides installers and technicians with convenient access during commissioning and field adjustment, regardless of the installation orientation.
Key Features
- 1″ NPT inlet and outlet connections for straightforward installation
- Maximum inlet pressure of 1/2 PSI — optimized for atmospheric burner systems
- Modulating operation for precise gas flow control and improved combustion efficiency
- Both sides fitted for low fire adjustment — flexible field commissioning
- Designed for use with atmospheric burners in commercial and residential heating equipment
- Manufactured by Maxitrol, a trusted leader in gas pressure regulation and modulation
Specifications
- SKU: M620B-1
- Brand: Maxitrol
- Connection Size: 1″ NPT
- Maximum Inlet Pressure: 1/2 PSI
- Valve Type: Modulating Gas Valve
- Application: Atmospheric Burners
- Low Fire Adjustment: Both sides fitted
Application
The M620B-1 is ideal for use in gas-fired heating appliances utilizing atmospheric burners, including boilers, furnaces, unit heaters, and other commercial or residential gas heating equipment. Its modulating capability allows the burner to operate at varying firing rates rather than simple on/off cycling, resulting in more consistent temperatures, reduced thermal stress on heat exchangers, and lower fuel consumption.







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