Armstrong International 811-3/4-70 Trap

The Armstrong International 811-3/4-70 Trap is a high-performance inverted bucket steam trap designed for exceptional energy efficiency and longevity in industrial steam systems. Engineered with a rugged cast iron body, this Series 811 model features a 3/4" NPT connection and a precision-lapped 5/32" orifice, optimized for a maximum operating pressure of 70 PSI. Its unique leverage system and bottom-in top-out configuration ensure reliable condensate removal while effectively venting air and CO2 at steam temperature to prevent corrosion. Ideal for heating units, heat exchangers, and process equipment, this industrial steam trap operates intermittently to provide a tight seal, even under light load conditions. By utilizing a water seal to prevent live steam loss, the Armstrong 800 Series remains a standard for steam system maintenance Professionals seeking durable Armstrong steam trap replacements for low-to-medium pressure applications.

Key Benefits

• Optimized Energy Savings: Inverted bucket design prevents live steam loss, significantly reducing fuel costs.
• Superior Durability: Robust cast iron construction and stainless steel internals provide resistance to wear and water hammer.
• Continuous Air Venting: Automatically discharges air and non-condensable gases to maintain system efficiency.
• Debris Management: The internal bucket design allows for the passage of small particles, minimizing the risk of clogging.
• Standardized Fit: 3/4" NPT threads allow for seamless integration into existing HVACR piping.

Common Questions

How do I choose the correct orifice size for a 70 PSI system?
Selecting the 5/32" orifice ensures the Armstrong 811 provides the correct discharge capacity for applications up to 70 PSI; using an oversized orifice at high pressures may prevent the trap from opening.

What are the maintenance requirements for the 800 Series traps?
The simple, mechanical design allows for easy inspection and cleaning, which is essential for preventing steam trap failure in aggressive environments.

Can this trap handle superheated steam?
While designed primarily for saturated steam, the cast iron Series 811 is suitable for various industrial environments where reliable condensate drainage is required without frequent manual intervention.

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.