Maxitrol M511-1/2 Valve

Engineered for high-precision thermal management in HVACR systems, the Maxitrol M511-1/2 is a specialized modulating gas valve designed for direct fired burners. This industrial-grade component is purpose-built for negative pressure (pull-through) applications where consistent gas modulation is critical for maintaining stable discharge air temperatures. This model features a 1/2" NPT connection and is fully compatible with Maxitrol Selectra Series 14 and 44 electronic modulation systems, supporting precise control without the need for additional motor-driven butterfly valves. This direct replacement for M511B-1/2 handles a 1/2 PSI maximum inlet pressure and utilizes a counter-spring design to ensure the valve remains closed against the suction of negative pressure air streams of up to -1.5” w.c. For contractors servicing industrial makeup air units or process heating equipment, this valve provides the necessary 9 to 11 Volts DC response to maximize burner efficiency and eliminate temperature fluctuations.

• Precise Gas Modulation: Eliminates the mechanical lag of butterfly valves, providing instantaneous flame adjustment for direct-fired systems.
• Negative Pressure Optimized: Specifically balanced for pull-through burner configurations to prevent leakage under high-suction conditions.
• Legacy Compatibility: Serves as a 1:1 replacement for Maxitrol M511B-1/2, ensuring minimal field modification during service calls.
• Broad System Integration: Designed to work seamlessly with Selectrastat sensors and Maxitrol amplifiers for automated temperature regulation.
• Extreme Environment Ready: Rated for ambient operating temperatures ranging from -40°F to 125°F, suitable for rooftop and industrial placements.

Is the M511-1/2 interchangeable with the M511B-1/2?
Yes, the M511-1/2 is the designated direct replacement for the M511B-1/2 model, maintaining identical technical specifications and port orientations.

Does this valve require an external pressure regulator?
As a Modulator (M) valve, it requires an upstream gas pressure regulator to establish the high-fire and low-fire setpoints, as it does not perform dual-function regulation like MR-series valves.

What modulation signal does this valve accept?
The valve is designed to operate on a 9 to 11 Volts DC signal typically supplied by a Maxitrol Series 14 or Series 44 amplifier.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.