Description
Armstrong International 15B4 Series B Float & Thermostatic Steam Trap
The Armstrong International 15B4 is a heavy-duty Series B Cast Iron Float & Thermostatic (F&T) steam trap engineered for reliable condensate removal and air venting in low-pressure steam systems. With a 1″ NPT standard connection and a 15 PSI maximum operating pressure rating, this trap is well-suited for a wide range of commercial and industrial heating applications including unit heaters, heat exchangers, and steam distribution systems.
Key Features
- Series B cast iron body construction for long-lasting durability in demanding steam environments
- 1″ NPT standard inlet and outlet connections for straightforward installation
- 15 PSI maximum operating pressure rating
- 5/16″ orifice for precise, efficient condensate discharge
- Integrated thermostatic air vent automatically purges non-condensable gases and air on startup and during operation
- Float-operated continuous condensate discharge — no slugging or water hammer
- Compact, serviceable design suitable for a variety of steam heating and process applications
How Float & Thermostatic Traps Work
F&T steam traps combine two mechanisms in a single body. The float valve responds to condensate level, opening continuously to discharge condensate as it forms — preventing backup and water hammer. The thermostatic element handles air and non-condensable gas removal, improving system efficiency and startup performance. Together, these features make the Armstrong 15B4 an ideal choice for applications requiring both continuous condensate drainage and reliable air venting.
Typical Applications
- Unit heaters and cabinet heaters
- Steam-to-water heat exchangers
- Fan coil units and air handling coils
- Low-pressure steam distribution and drip service
- Process heating equipment
Specifications
- SKU: 15B4
- Brand: Armstrong International
- Series: B
- Body Material: Cast Iron
- Connection Size: 1″ NPT
- Connection Type: Standard (screwed)
- Maximum Operating Pressure: 15 PSI
- Orifice Size: 5/16″
- Trap Type: Float & Thermostatic (F&T)
- Air Vent: Thermostatic
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