Armstrong International B1669-2 Pressure Change Assembly

The Armstrong International B1669-2 Pressure Change Assembly is a precision-engineered internal repair kit designed to restore the seal and mechanical operation of high-performance inverted bucket steam traps. Featuring a 3/16" orifice, this assembly is critical for maintaining the correct discharge capacity and pressure differential in models across the Armstrong 211, 310, 800, 811, 880, and 981 series, including the TVS-811 and EM variations. This kit includes the valve, valve seat, valve retainer, lever, and guide pin assembly, allowing for a complete overhaul of the trap's internal mechanism to prevent steam loss and ensure efficient condensate removal.

For veteran contractors, the B1669-2 PCA kit is the standard for resolving common trap failures such as steam trap priming loss or internal wire-drawing. By replacing the entire pressure change assembly, you ensure that the guide pins and leverage points are aligned, preventing the valve from striking the seat off-center—a frequent cause of premature wear in high-cycle industrial steam systems. This heavy-duty assembly is built to withstand the rigorous demands of drip leg applications and process heat and is the designated replacement part for maintaining the 20 to 50 PSI maximum operating pressure (MOP) ratings depending on the specific trap body configuration.

• Universal Compatibility: Fits a wide range of Armstrong inverted bucket traps including the 211, 800, 811, 880, 881, 981, and TVS-811.
• Optimized 3/16" Orifice: Precision-sized for balanced condensate discharge and air venting within the rated pressure range.
• Complete Mechanism Restore: Includes all critical wear components—valve, seat, and lever—to eliminate "clattering" or "failed open" conditions.
• Durable Construction: High-grade materials resist erosion and corrosion, common in systems with high dirt or pipe scale levels.

Common Questions:

How do I know if I need a 3/16" orifice size for my trap?
The orifice size is determined by the maximum differential pressure of your system. A 3/16" orifice is typically suited for pressures up to 20-50 PSI depending on the trap model (e.g., 800-20psi or 981-50psi). Always verify the stamp on your trap body or nameplate before installation.

What are the signs that my Pressure Change Assembly (PCA) has failed?
Typical failure indicators include a "hot trap" with no condensate discharge, constant steam blowing into the return line, or an audible lack of the characteristic "clank-clank" cycling sound when checked with an ultrasonic tester.

Does this kit include the bucket?
No, this is a "mechanism less bucket" kit. If your bucket is ruptured or corroded, it must be purchased separately to ensure the trap regains its prime and buoyancy.

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.