Maxitrol M511B-3/4 Valve

3/4" NPT Modulating Gas Valve for Direct Fired (Negative Pressure) Burners with 1/2 PSI Inlet Pressure Max and both side fitted for low fire adjustment

M511B-3/4 is the direct replacement for M511-3/4 (HAS LOW FIRE ADJUSTMENT ON BOTH SIDES)

Maxitrol M511B-3/4 Modulating Gas Valve | 3/4" NPT | Direct-Fired Burners

The Maxitrol M511B-3/4 Gas Valve is a high-precision modulating valve designed for advanced heating systems, including the Maxitrol Selectra series. Engineered for direct-fired, negative pressure burners, this valve provides stable and accurate flame modulation, delivering reliable performance even with varying gas supply and load conditions.

With a ¾″ NPT connection and vent taps on both sides for low-fire adjustment, the M511B enables precise, instantaneous control without the need for moving butterfly components or external mechanical actuation. Ideal for applications requiring consistent, efficient, and safe gas flow in high-performance heating systems.

Product Highlights

• Genuine Maxitrol OEM Modulating Gas Valve

• Size: 3/4″ NPT

• Compatible with Series 14 and Series 44 burners

• Maximum inlet pressure: 1/2 PSI

• Dual vent taps for precise low-fire adjustment

• Engineered for direct-fired, negative pressure systems

• Provides stable and consistent flame modulation across load changes

Specifications

• Brand: Maxitrol

• Model Number: M511B-3/4

• Connection Type: 3/4″ NPT

• Application: Direct-Fired Burners, Negative Pressure Systems

• Compatible Series: 14, 44

• Max Inlet Pressure: 1/2 PSI

• Type: Modulating Gas Valve

Description

The Maxitrol M511B-3/4 ensures precise and instantaneous flame modulation for negative pressure burners. Its innovative design eliminates the need for moving parts, delivering smooth, stable operation for both commercial and residential heating applications. This valve is ideal for anyone looking to maintain optimal system efficiency, safety, and performance.