Armstrong International 811-3/4-125 Trap

The Armstrong International 811-3/4-125 Trap is a high-performance 3/4 inch NPT inverted bucket steam trap engineered for superior condensate management in industrial steam systems. Constructed with a rugged ASTM A48 Class 30 cast iron body, this Series 811 steam trap is designed to operate reliably at a maximum allowable pressure of 125 PSI. Featuring a precision-lapped 1/8 inch orifice and stainless steel internal components, it ensures efficient energy conservation by preventing steam loss while continuously discharging air and non-condensable gases. Ideally suited for space-constrained applications, this side inlet side outlet steam trap offers a compact horizontal piping solution for heaters, heat exchangers, and steam main drips. Its unique leverage system provides a positive closing pressure to prevent seat leakage, making it a preferred choice for HVACR technical specifications requiring durable, long-term performance in demanding steam environments.

Key Benefits

• Energy Efficiency: The inverted bucket design ensures immediate condensate discharge with zero steam loss.
• Superior Durability: Robust cast iron construction and stainless steel internals resist wear and water hammer.
• Self-Cleaning Action: Continuous agitation helps prevent the accumulation of dirt and scale within the trap mechanism.
• Reliable Venting: Automatic venting of air and CO2 at steam temperature prevents air binding and corrosion.
• Maintenance Ease: The horizontal design allows for simple installation and periodic inspections within existing pipe runs.

Common Questions

How do I select the correct orifice size for my steam system?
Orifice selection depends on the maximum operating pressure and the required condensate capacity; the 1/8" orifice in this model is optimized for 125 PSI applications.

Can the Armstrong 811 handle water hammer?
Yes, the inverted bucket mechanism is inherently resistant to water hammer, providing greater longevity compared to thermostatic or float traps.

Is this steam trap suitable for outdoor installation?
While the Series 811 is durable, it must be properly insulated or freeze-protected if installed in environments where ambient temperatures drop below freezing.

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.