Armstrong International A5628 Vacuum Breaker

The Armstrong International A5628 is a professional-grade 1/2" NPT Vacuum Breaker engineered to protect steam systems from the damaging effects of induced vacuum. In modulated steam applications, a vacuum often forms as steam condenses, which can stall condensate flow and lead to destructive water hammer or equipment freezing. This stainless steel component is designed for direct installation into the top of Float & Thermostatic Traps, providing a reliable air-relief path to equalize pressure. It is fully compatible with Armstrong A Series and B Series traps, including models such as the A6, A8, B6, B8, J, JD, K, KD, L, LS, M, and MS. By integrating this steam system vacuum breaker, technicians ensure consistent drainage and prevent the collapse of heat exchanger tubes or tanks. Built with a high-temperature EPDM diaphragm and rugged stainless steel internals, the A5628 maintains a tight seal under standard operating pressures and temperatures up to 212°F, making it an essential HVACR replacement part for industrial steam service.

Key Benefits:

• Prevents Water Hammer: Eliminates vacuum conditions that cause condensate to back up into heat exchangers.
• Extensive Compatibility: Designed specifically for Armstrong F&T traps across the A, B, J, K, L, and M series.
• Durable Construction: Features stainless steel body and internals for corrosion resistance in harsh steam environments.
• System Safety: Protects against coil freezing and mechanical failure caused by sub-atmospheric pressure.
• Easy Integration: Standard 1/2" NPT connection allows for fast, threaded installation on existing trap caps.

Common Questions:

When should I install an Armstrong A5628 vacuum breaker?
It is recommended for any steam equipment under modulated control where a vacuum can form, such as air handling unit (AHU) coils, shell-and-tube heat exchangers, or storage tanks. If you notice "clanging" noises or poor drainage during low-load periods, a vacuum breaker is likely required.

Can this be used on high-pressure steam systems?
The A5628 is rated for use with F&T traps. Ensure your system's operating pressure does not exceed the 100 psi rating of the vacuum breaker to maintain proper diaphragm performance and sealing integrity.

Does it matter if the vacuum breaker is installed vertically or horizontally?
For optimal performance and to ensure gravity assists the internal check mechanism, it should be installed vertically into the designated NPT port on the top of the steam trap or header piping.

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.

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