Armstrong International D25519 Repair Kit

The Armstrong International D25519 Repair Kit is a critical OEM maintenance solution for restoring the integrity of 1/2" and 3/4" TS-2 series steam traps. As a direct replacement for the legacy 6231299 kit, this K-370 series kit provides the comprehensive internals required to address common failure points in thermostatic steam traps. The assembly includes a precision-engineered bellows assembly, a hardened seat, and a high-temperature gasket, ensuring a secondary seal that prevents steam loss and maintains system pressure. Designed for rigorous industrial HVAC environments, these components are fabricated to withstand acidic condensate and thermal cycling, which often compromise non-OEM alternatives. Utilizing the D25519 kit ensures that your Armstrong TS-2 trap maintains its original discharge capacity and operational efficiency, preventing live steam from entering the condensate return lines. For contractors managing large-scale mechanical rooms, this kit provides a standardized repair path for both 1/2" and 3/4" NPT configurations.

Key Technical Benefits:

• OEM Compatibility: Specifically engineered for Armstrong International TS-2 thermostatic traps, ensuring precise seat alignment and bellows expansion rates.
• Direct Cross-Reference: Serves as the official successor to part 6231299, simplifying inventory management for older steam systems.
• High-Integrity Bellows: The phosphorus-bronze or stainless steel construction provides the necessary sensitivity to temperature changes for accurate trap cycling.
• Comprehensive Internals: Includes the seat and gasket to ensure a leak-free rebuild and optimal seating torque during installation.
• Operational Efficiency: Restores trap performance to original specifications, reducing energy waste and preventing localized water hammer.

Common Questions:

What is the difference between the K-370 and the D25519?
The K-370 is the internal kit designation used by Armstrong technical manuals, while D25519 is the specific part number used for ordering the TS-2 repair kit for 1/2" and 3/4" sizes.

Can this kit be used for TS-1 or TS-3 series traps?
No, this kit is specifically calibrated for the stroke and orifice size of the TS-2 series. Using these internals in a TS-1 or TS-3 body will result in improper trap operation or failure to close.

How do I know if my bellows assembly needs replacement?
If the trap is "failed open" (blowing live steam) or "failed closed" (backing up condensate), the bellows assembly has likely lost its charge or become distorted due to water hammer, requiring a full kit replacement.

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.