Description
Armstrong International Series 811 Cast Iron Inverted Bucket Steam Trap
The Armstrong International 811-3/4-15 is a heavy-duty Series 811 cast iron inverted bucket steam trap engineered for dependable, continuous condensate removal in industrial and commercial steam distribution systems. With a 3/4″ NPT connection, a 15 PSI operating pressure rating, and a 1/4″ orifice, this trap delivers the precise discharge control needed to maintain system efficiency and protect downstream equipment from water hammer and energy loss.
How It Works
The inverted bucket mechanism is one of the most proven and robust steam trap designs in the industry. As condensate fills the trap body, the inverted bucket sinks and opens the discharge valve, allowing condensate and non-condensable gases to be expelled. When live steam enters, the bucket floats and closes the valve, preventing steam loss. This mechanical action requires no external power and provides reliable, self-regulating operation across a wide range of load conditions.
Key Features
- Series 811 cast iron body construction for durability in demanding steam applications
- 3/4″ NPT inlet and outlet connections for easy integration into standard piping
- 15 PSI maximum operating pressure rating
- 1/4″ orifice for accurate condensate metering and discharge control
- Inverted bucket mechanism — proven, self-regulating, and mechanically simple
- Automatic air venting capability to purge non-condensable gases on startup
- No external power required — fully mechanical operation
- Designed for long service life with minimal maintenance requirements
Typical Applications
- Steam distribution mains and branch lines
- Drip trap service on steam supply headers
- Process heating equipment condensate return
- Unit heaters and heat exchangers
- Industrial and commercial boiler plant steam systems
Product Specifications
- Brand: Armstrong International
- Model / SKU: 811-3/4-15
- Series: 811
- Body Material: Cast Iron
- Connection Size: 3/4″ NPT
- Maximum Operating Pressure: 15 PSI
- Orifice Size: 1/4″
- Trap Type: Inverted Bucket
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