Maxitrol R400S-1/2 Regulator

The Maxitrol R400S-1/2 Gas Regulator is a double diaphragm balanced valve design engineered for high-performance pressure regulation in residential, commercial, and industrial gas systems. This 1/2 inch NPT gas regulator is specifically built to handle a 5 PSI max inlet pressure, providing stable lockup and precise control even during significant fluctuations in supply pressure. With an adjustable 3-8" WC outlet pressure range, it is a critical component for maintaining consistent manifold pressure in furnaces, boilers, and high-efficiency water heaters. The balanced valve construction eliminates the effect of inlet pressure variations on the downstream flow, ensuring equipment operates within narrow technical parameters. Designed for multi-poise installation, this Maxitrol R400S series unit features rugged aluminum die-cast components and high-grade nitrile rubber diaphragms suitable for use with natural gas, LPG, and clean air mixtures. For contractors, this means reduced service calls related to pilot outages or fluctuating burner flames.

• Precise Gas Pressure Control: The balanced valve design maintains a steady 3-8" water column output, protecting sensitive downstream gas valves and burner orifices.
• High Inlet Pressure Rating: Tested to 5 PSI max inlet pressure, allowing for versatile application in both low and medium-pressure gas piping networks.
• Lockup Performance: Provides superior gas regulator lockup characteristics, preventing pressure spikes during equipment off-cycles.
• Durable Construction: Features a 1/2" NPT connection and corrosion-resistant housing for long-term reliability in demanding HVACR environments.
• Application Versatility: Ideal for natural gas and propane applications requiring high flow capacity and sensitive regulation.

Can the Maxitrol R400S-1/2 be installed in any orientation?
Yes, the R400S series is designed for multi-poise installation, though it is standard practice to install the regulator in a horizontal upright position to ensure easiest access for pressure adjustments and venting.

What is the purpose of the double diaphragm in this model?
The double diaphragm provides an internal safety mechanism and enhances the balanced valve effect, allowing the regulator to remain stable and accurate regardless of inlet pressure changes.

Is this regulator suitable for outdoor installation?
The R400S-1/2 is typically intended for indoor use or within a protected enclosure. If used outdoors, a vent protector must be utilized to prevent moisture or debris from entering the atmospheric vent hole.

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.