Xylem 404336 B1125A-3 3/4" Inverted Bucket Steam Trap 125 PSI Cast Iron

The Xylem Hoffman Specialty 404336 is a Series B1 inverted bucket steam trap designed for efficient condensate drainage in industrial process and HVAC equipment. This trap features a 3/4-inch NPT connection in an in-line horizontal configuration, allowing steam to enter from one side and condensate to discharge from the opposite side.

How It Works: The inverted bucket trap relies on the density difference between steam and water to drain condensate as it forms. An inverted bucket floats in condensate that surrounds the bucket. As the bucket moves up and down in the condensate, a linkage connected to the bucket closes or opens a discharge valve, trapping the condensate or allowing it to escape. This simple leverage system uses the weight of the bucket to open the valve against pressure.

Key Specifications:

• Model B1125A-3 without strainer
• Connection size: 3/4 inch NPT
• Maximum operating pressure: 125 PSI
• Condensate capacity: 920 pounds per hour
• Cast iron construction for durability
• In-line horizontal mounting configuration
• Erosion-resistant cover
• Removable covers for easy maintenance

Features and Benefits:

• Drains condensate at saturation temperature for maximum system efficiency
• High resistance to wear, corrosion, and moderate water hammer
• Only two moving parts (lever assembly and bucket) for reliable operation
• Open bucket design tolerates dirt and sediment
• Normal failure mode is open for safety
• Designed for heat exchange equipment where fast air and non-condensable gas venting is needed
• Excellent performance under light loads and against back pressure

Installation Note: The trap body must be manually primed at initial start-up to provide the necessary water seal. Under operation, the trap body will remain full of condensate.

Hoffman Specialty, a Xylem brand since 2011, has been a trusted name in steam and hydronic systems since 1913, offering comprehensive solutions from steam traps to valves, boiler feed units, and temperature regulators for both residential and commercial applications.