Armstrong International A21958-1 Gasket

The Armstrong International A21958-1 Gasket is a precision-engineered sealing component designed for Float & Thermostatic (F&T) steam traps. This high-temperature gasket ensures a pressure-tight seal between the trap body and cap, preventing steam loss and maintaining system efficiency. Compatible with a broad range of Armstrong F&T traps, including the AI2, A3, AI3, A4, AI4, A5, BI2, BI3, B4, BI4, and B5 series, this component is critical for maintenance cycles involving the 15, 30, 75, and 125 psi rated units. In industrial steam systems, a compromised gasket leads to "short-circuiting" or live steam bypass, which increases fuel costs and destabilizes downstream pressure. This replacement steam trap gasket is manufactured to withstand rapid thermal cycling and high differential pressures. For contractors performing trap surveys or routine overhaul, using the A21958-1 gasket ensures OEM-spec fitment and eliminates the risks associated with generic alternatives which may fail under peak condensate loads.

• Broad Compatibility: Engineered specifically for Armstrong F&T Series A and B bodies, including both horizontal and vertical piping configurations.
• High Thermal Stability: Material composition is rated for saturated steam environments, preventing gasket creep and blowout under high-pressure steam conditions.
• Optimized Sealing Surface: Designed to compensate for minor flange irregularities, ensuring a leak-free steam trap assembly during reinstallation.
• Reduced Maintenance Downtime: Precise dimensions allow for rapid drop-in replacement during steam system maintenance.

Common Questions

Is the Armstrong A21958-1 compatible with all B-Series traps?
The A21958-1 gasket fits specific models within the B series, including the BI2, BI3, B4, BI4, and B5. Always verify the specific trap body size and pressure rating before installation.

What are the symptoms of a failing F&T trap gasket?
External steam leaks at the body-to-cap joint or an unable to maintain prime are primary indicators that the steam trap seal requires replacement.

Does this gasket require special sealants during installation?
For Armstrong F&T steam traps, it is recommended to install the gasket dry on clean, prepared metal surfaces to ensure the OEM compression rating is achieved.

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.