Maxitrol R400B10-25 Spring

The Maxitrol R400B10-25 is a high-precision plated spring designed specifically for R400 and R400S Series regulators. Engineered for field technical reliability, this replacement regulator spring allows contractors to calibrate gas systems within a 2" to 5" w.c. outlet pressure range. The 1-9/16" plated steel construction ensures repeatable tension and resistance to fatigue, maintaining steady-state manifold pressure under demanding commercial and industrial load profiles. As a genuine Maxitrol replacement part, it facilitates seamless integration during routine maintenance or system re-rating. By utilizing the R400B10-25 spring, technicians can ensure the regulator maintains the specific stack height and spring rate required for accurate gas pressure regulation in low-pressure applications. This specialized component is the standard choice for professionals seeking to restore OEM performance without the need for entire valve replacement, effectively extending the service life of existing Maxitrol gas regulators.

• Precise Pressure Range: Calibrated specifically for 2-5" water column (w.c.) setpoints, ideal for standard industrial combustion equipment.
• Broad Series Compatibility: Engineered as a direct drop-in replacement for any Maxitrol R400 or R400S series regulator body.
• Durable Plated Finish: The plated surface prevents oxidation and maintains spring rate integrity over long-term operation.
• Ease of Installation: Standard 1-9/16" length allows for quick swap-outs during field pressure adjustments or conversions.

What is the color code for the R400B10-25 spring?
This spring is officially designated as Plated (Zinc/Silver appearance) to distinguish it from the 10-22" w.c. Red spring or the 1-3.5" w.c. Brown spring used in the same regulator bodies.

Can I use this spring to convert a high-pressure regulator to low pressure?
Yes, if the regulator body is an R400 or R400S, installing the R400B10-25 will change the adjustable outlet pressure range to the 2" to 5" w.c. window.

Does this spring include the adjusting screw?
No, this is the internal regulator spring only. The existing adjusting screw and seal cap from the R400 unit should be reused during the installation.

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.