Armstrong International 175A3 Trap

The Armstrong International 175A3 is a high-performance Series A Cast Iron Float & Thermostatic Steam Trap engineered for demanding industrial and HVAC applications. Designed with a 3/4" NPT connection and a 7/64" orifice, this F&T steam trap provides continuous drainage of condensate while efficiently venting air and non-condensable gases through its integral thermostatic air vent. It is specifically optimized for heat exchange equipment where modulated steam pressure is present, capable of handling variable loads up to a maximum operating pressure of 175 PSI. The rugged cast iron body housing and stainless steel internals ensure long-term reliability in systems requiring rapid air removal during start-up. Whether managing heavy condensate loads or maintaining temperature control in coils and heat exchangers, the Armstrong 175A3 Trap delivers the energy efficiency and steam system performance required for modern facility maintenance and industrial steam trap management.

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• Continuous Condensate Drainage: The float-actuated mechanism ensures immediate discharge of condensate as it forms, preventing water hammer and maintaining thermal efficiency.
• High Venting Capacity: Features a balanced pressure phosphor-bronze bellows that quickly clears air and CO2, even at low pressures.
• Versatile Application: Ideal for systems with modulating pressures and varying loads, typically found in unit heaters, water heaters, and steam coils.
• Durable Construction: Built with a heavy-duty ASTM A48 Class 30 cast iron body and corrosion-resistant stainless steel valve and seat.
• Operational Reliability: Operates effectively against high back pressure (up to 99% of inlet pressure) without losing functionality.

How does the Armstrong 175A3 handle air during system start-up?
The balanced pressure thermostatic bellows stays open when cold, allowing a high volume of air to vent rapidly through a separate orifice. As steam reaches the trap, the heat causes the bellows to close, preventing steam loss.

What is the maximum capacity of this 3/4" F&T trap?
The 175A3 model is rated for a maximum operating pressure of 175 PSI and can handle condensate capacities of up to 1,150 lbs/hr depending on the differential pressure.

Can this trap be installed in vertical piping?
No, this specific Series A cast iron trap is designed for horizontal installation. For vertical applications, specific "AI" (In-line) series traps should be utilized.

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.