Maxitrol R400S-1/2-CSA Regulator

The Maxitrol R400S-1/2-CSA is a high-performance gas pressure regulator engineered for precision in residential, commercial, and industrial applications. Built with a double diaphragm balanced valve design, this unit excels at maintaining a steady outlet pressure even when subjected to widely varying inlet pressures. This specific model features 1/2 inch NPT connections and a CSA certified maximum inlet pressure of 1/2 PSI, though it has been Maxitrol tested for up to 5 PSI. Its internal construction includes a resilient, chemically bonded synthetic rubber ring on the valve member, which provides superior seating for reliable pilot flow applications.

Designed for versatile field installation, the Maxitrol R400S-1/2-CSA supports multi-positional mounting, making it an ideal choice for infrared heaters, pilot lines, and small boilers. The 3-6" w.c. outlet pressure range is factory-standard and CSA certified, ensuring compliance with strict safety protocols. This balanced valve regulator is chemically compatible with natural, manufactured, mixed, liquefied petroleum gases, and LP gas-air mixtures. Its compact aluminum die-cast housing provides a rugged footprint without sacrificing the high capacity characteristics required by veteran HVAC technicians for demanding gas appliance pressure regulation tasks.

• Consistent Pressure Control: The double diaphragm design eliminates the inlet pressure effect, ensuring stable flow to the main burner.
• Exceptional Low-Flow Performance: Specifically suited for pilot load applications and standing pilots where precise regulation is critical.
• Durable Construction: Features a corrosion-resistant aluminum housing and high-quality internal components for long-term reliability in the field.
• Broad Gas Compatibility: Approved for use with natural gas and LP gas mixtures, providing flexibility across different fuel systems.
• Compact Form Factor: Small physical size allows for easy integration into tight appliance manifolds and industrial heater cabinets.

Is the R400S suitable for dead-end lockup service?

No, the R series regulators are not intended for dead-end lockup service. They are designed for main burner and pilot load applications but should not be used as a line pressure regulator for appliances with electronic ignition unless the control valve can open against line pressure.

Can I mount this regulator horizontally?

Yes, the R400S-1/2-CSA is suitable for multi-positional mounting. However, if a ball check vent limiting device is installed, the regulator must be mounted in the upright position only.

What is the difference between the CSA certified and Maxitrol tested pressure ratings?

The 1/2 PSI rating is the maximum inlet pressure certified under ANSI Z21.18/CSA 6.3 standards. The 5 PSI rating indicates the maximum pressure for which the unit has been functionally tested by the manufacturer for non-certified applications.

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.