Armstrong International B1669-1 Pressure Change Assembly

The Armstrong International B1669-1 Pressure Change Assembly (PCA) is a critical steam trap repair kit engineered specifically for inverted bucket traps. This assembly includes a matched 1/4" orifice, valve seat, and lever mechanism, providing a direct drop-in solution for maintaining trap efficiency. Designed for Armstrong 811, 211, 310, TVS-811, 881, 981, and EM series traps, this PCA is calibrated for a 15 PSI maximum operating pressure. Utilizing a stainless steel valve seat ensures a high-integrity metal-to-metal seal without the need for pipe dope or external lubricants. By replacing the entire trap mechanism simultaneously, technicians can restore the original condensate discharge capacity and prevent common failures such as "failed open" traps or steam loss. This precision-lapped set is essential for heavy-duty HVAC steam system maintenance and industrial steam distribution where consistent saturated steam temperature is required at the drip point.

• Optimized Performance: Specifically tuned for 15 PSI differentials to prevent short-cycling and ensure consistent condensate drainage.
• Broad Compatibility: Supports a wide range of Armstrong inverted bucket traps including the 211, 310, 811, 881, and 981 series.
• Complete Rebuild Kit: Includes the valve seat, valve lever, and guide pin assembly for a comprehensive internal overhaul.
• Durable Construction: High-grade stainless steel internal components resist erosive wear and scale buildup in demanding steam environments.
• Precision Sealing: Features a 1/4" orifice designed for precise lift and closure, minimizing flash steam bypass.

When should the B1669-1 assembly be replaced?
Veteran technicians recommend inspecting internal mechanisms every 3 to 5 years. If a trap is blowing live steam or failing to discharge condensate, the orifice and valve seat are likely wire-drawn or fouled, necessitating a full PCA replacement.

Why must the seat and lever be replaced as a set?
Armstrong valves and seats are lapped together at the factory. Mixing new seats with old levers often results in misalignment, which prevents a tight seal and leads to premature steam trap failure.

Is a new body gasket included in this kit?
No, this kit contains the internal pressure change mechanism only. A separate body gasket must be sourced based on the specific trap model (e.g., 211 or 811 series) to ensure a leak-free seal after reassembly.

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.