Description
The Armstrong International Series 812 Cast Iron Inverted Bucket Steam Trap (Model 812-3/4-125) is a time-tested, mechanically operated steam trap engineered for dependable condensate discharge in a wide range of industrial and commercial steam system applications. Built around the proven inverted bucket operating principle, this trap reliably discharges condensate while preventing live steam loss — helping to maximize energy efficiency and protect downstream equipment.
Inverted Bucket Operating Principle
The inverted bucket mechanism operates on the difference in density between steam and condensate. When steam enters the trap, the inverted bucket floats and closes the discharge valve, holding steam in the system. As condensate accumulates, the bucket loses buoyancy and sinks, opening the valve to discharge condensate. A small vent hole in the top of the bucket continuously purges non-condensable gases, preventing air binding and ensuring consistent trap performance.
Key Specifications
- Model / SKU: 812-3/4-125
- Series: Armstrong International Series 812
- Connection Size: 3/4″ NPT
- Maximum Allowable Pressure (MAP): 125 PSI
- Orifice Size: 5/32″
- Body Material: Cast Iron
- Operation Type: Inverted Bucket (Mechanical)
Features & Benefits
- Cast iron body construction provides durability and long service life in demanding steam environments
- Inverted bucket mechanism delivers continuous, reliable condensate discharge without the need for external power
- Integral air vent in the bucket top automatically purges non-condensable gases to prevent air binding
- 3/4″ NPT connections for straightforward installation into standard steam piping systems
- Rated to 125 PSI maximum allowable pressure, suitable for a broad range of low-to-medium pressure steam applications
- 5/32″ orifice sized for efficient condensate handling at rated pressure
- Simple, rugged design with minimal moving parts for reduced maintenance requirements
- Suitable for use on steam mains, unit heaters, heat exchangers, drip legs, and process equipment
Typical Applications
- Steam main drip stations
- Unit heaters and cabinet heaters
- Heat exchangers and process heating equipment
- Steam tracer lines
- Industrial and commercial HVAC steam systems
About Armstrong International Series 812
Armstrong International is a globally recognized leader in steam, air, and hot water system solutions. The Series 812 inverted bucket steam trap line is engineered to deliver consistent performance, energy savings, and long service intervals — making it a trusted choice among mechanical contractors, facility engineers, and HVAC professionals worldwide.
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