Armstrong International 811-1/2-125 Trap

The Armstrong International 811-1/2-125 is a high-performance Series 811 Cast Iron Inverted Bucket Steam Trap designed for rigorous industrial environments. Featuring a 1/2" NPT connection and a precision-engineered 1/8" orifice, this trap is optimized for systems operating at a maximum pressure of 125 PSI. Its robust cast iron body houses a unique leverage system and stainless steel internal components that resist water hammer, corrosion, and hydronic shock. The inverted bucket design provides continuous air and CO2 venting at steam temperature, preventing air binding and ensuring efficient condensate drainage. Because the discharge orifice is positioned at the top of the trap, dirt particles remain in suspension and are purged during the discharge cycle, making it an ideal choice for HVACR and laundry equipment where reliability is paramount. This mechanical steam trap maintains a tight seal throughout its service life, preserving energy and reducing operational costs with zero cooling lag.

Key Benefits

• Enhanced Energy Efficiency: The inverted bucket mechanism prevents live steam loss by maintaining a permanent water seal.
• Extreme Durability: Features a rugged cast iron housing and wear-resistant stainless steel internals for long-term service.
• Dirt Handling Capability: The top-mounted valve design allows small particles to be purged without clogging the 1/8" orifice.
• Water Hammer Resistance: The open-bottom bucket design prevents damage from sudden pressure surges or hydronic shock.
• Minimal Maintenance: A free-floating leverage system with no fixed pivots reduces friction and extends the trap's life.

Common Questions

What is the maximum operating temperature for the 811 series?
The Armstrong Series 811 is typically rated for temperatures up to 450°F (232°C) in standard configurations.

Can this trap be installed in vertical piping?
No, the Armstrong 811-1/2-125 is specifically designed for horizontal installation with the bucket hanging vertically inside the body.

How does it handle non-condensable gases?
The bucket features a small vent hole that provides continuous automatic air and CO2 venting at steam temperature, preventing air binding without the need for additional thermostatic elements.

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.