Maxitrol R400B10-412 Spring

The Maxitrol R400B10-412 Violet Spring is a critical field-service component designed for precise gas pressure regulation within the R400 and R400S Series appliance regulators. This heavy-duty spring allows technicians to calibrate outlet pressure within a specific 4 to 12 inches water column (w.c.) range, ensuring stable performance for both main burner and pilot load applications. As a color-coded violet spring, it provides immediate visual identification for contractors during manifold adjustments or system retrofits. Engineered for use with natural, manufactured, mixed, liquefied petroleum gases, and LP gas-air mixtures, it maintains the integrity of the balanced valve design found in the Maxitrol R Series. This part is essential when converting or fine-tuning industrial heaters, infrared equipment, or boiler pilot lines that require slightly higher manifold pressures than standard factory settings. Its robust construction ensures long-term repeatability and consistent combustion efficiency across varying inlet pressures.

• Precise Pressure Range: Precisely engineered to provide an adjustable 4-12" w.c. outlet pressure for light commercial and industrial gas applications.
• Broad Compatibility: Fully compatible with both the Maxitrol R400 and R400S regulator bodies.
• Technical Identification: Color-coded violet for fast field verification, preventing incorrect spring installation during multi-stage maintenance.
• Multi-Gas Versatility: Suitable for use with Natural Gas, LP (Propane), and other common fuel gas mixtures.
• Balanced Performance: Designed to work with Maxitrol’s double-diaphragm system to mitigate inlet pressure fluctuations.

How do I identify if this is the correct spring for my R400 regulator?
Inspect the existing spring or check the regulatory data plate. The R400B10-412 is identifiable by its violet color and is specifically rated for the 4" to 12" w.c. range. If your application requires a lower or higher pressure (e.g., 10-22" w.c.), you would need a different color-coded part, such as the red spring.

Can I use this spring in an R400Z zero governor model?
No. Zero governor (Z) models utilize different internal counter-spring mechanisms for zero or sub-atmospheric pressure control. This spring is designed for standard outlet pressure regulation in the R&RS series.

Is this spring compatible with other brands of gas regulators?
No, this is an OEM Maxitrol part. Gas regulator springs are non-universal and are calibrated to the specific diaphragm area and throw of the Maxitrol R400/R400S housing to ensure safety and accuracy.

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.