Armstrong International 125A3 Trap

The Armstrong International 125A3 is a high-performance Series A Cast Iron Float & Thermostatic Steam Trap designed for rigorous industrial and HVAC applications. Featuring a 3/4" NPT standard connection and an 1/8" orifice, this unit is engineered to manage condensate loads of up to 1,275 lbs/hr at a 125 PSI maximum operating pressure. Its rugged cast iron body houses a balanced pressure phosphor-bronze bellows and all-stainless steel internals, ensuring long-term resistance to corrosion and hydraulic shock. The integrated thermostatic air vent provides rapid air removal during system start-up, preventing air binding and optimizing heat transfer efficiency in equipment such as unit heaters, heat exchangers, and steam main drips. By modulating discharge based on condensate levels, the Armstrong 125A3 trap maintains a continuous flow while providing a tight water seal to prevent steam loss, even under varying pressures or high back-pressure conditions.

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• Continuous Condensate Drainage: Modulating float mechanism ensures immediate removal of condensate as it forms, maintaining stable temperatures in heat exchange equipment.
• Enhanced Air Handling: The built-in thermostatic air vent quickly discharges non-condensable gases and air, significantly reducing system warm-up times.
• Durable Construction: Features ASTM A48 Class 30 cast iron housing and 304 stainless steel internals for superior wear resistance.
• Versatile Operation: Operates efficiently against back pressure and handles widely varying loads, making it ideal for modulated steam systems.
• Same-Side Configuration: The 3/4" NPT parallel piping design allows for straightforward installation and maintenance in compact industrial spaces.

What is the maximum operating pressure for the 125A3 model?
This specific model is rated for a maximum operating pressure of 125 PSI (8.5 bar) saturated steam.

Can the 125A3 handle systems with significant air during start-up?
Yes, the Series A F&T trap is specifically designed for high-capacity air venting through its separate thermostatic orifice, which is essential for rapid heating and preventing air-related cold spots.

Is this trap suitable for outdoor applications prone to freezing?
Cast iron traps are generally not recommended for environments where freezing or excessive thermal shock may occur unless properly insulated and drained.

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.