Armstrong International 800-3/4-80 Trap

The Armstrong International 800-3/4-80 is a rugged cast iron inverted bucket steam trap designed for vertical installations in industrial and commercial steam systems. Utilizing a 3/4" NPT connection and a 1/8" orifice, this Series 800 trap is engineered to handle a maximum allowable pressure (PMA) of 250 psig, though this specific configuration is optimized for a maximum operating pressure (MOP) of 80 psi. Its inverted bucket mechanism provides excellent resistance to water hammer and features a unique leverage system that ensures positive shut-off and high condensate drainage capacity. Unlike thermostatic traps, the 800 Series operates based on the density difference between steam and water, allowing for continuous air venting through the bucket vent. This model is ideal for drip leg service, unit heaters, and small heat exchangers where reliable condensate management and long-term durability are critical for system efficiency.

• Corrosion Resistance: High-quality ASTM A48 Class 30 cast iron body ensures longevity in demanding steam environments.
• Internal Durability: Equipped with stainless steel internals and a hardened chrome steel valve and seat to minimize erosion.
• Versatile Application: Suitable for constant load applications requiring an in-line vertical piping configuration.
• Efficient Air Handling: Continuous venting prevents air binding and ensures rapid heat-up of steam-using equipment.

Common Steam Trap Questions

What is the maximum differential pressure for this model?
The Armstrong 800-3/4-80 is specifically rated for a maximum differential pressure of 80 psi. Utilizing it in systems exceeding this pressure will prevent the orifice from opening against the internal force.

Can this trap be installed horizontally?
No, the Series 800 is designed strictly for vertical installations to ensure the inverted bucket functions correctly via gravity and buoyancy.

What happens if the internal prime is lost?
If the water seal or prime is lost, the trap will fail open, blowing live steam. This is typically corrected by ensuring consistent condensate flow or checking for high-pressure fluctuations.

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.