Description
The Armstrong International Series 811 Cast Iron Inverted Bucket Steam Trap (Model 811-3/4-125) is a rugged, time-tested solution for reliable condensate drainage and air venting in steam distribution systems. Engineered for demanding commercial and industrial applications, this trap leverages the proven inverted bucket operating principle to deliver continuous, energy-efficient steam system performance.
Product Overview
The Series 811 inverted bucket steam trap operates on a simple yet highly dependable mechanical principle: the inverted bucket rises when steam is present, closing the discharge valve, and sinks when condensate or air fills the trap body, opening the valve to discharge. This design provides excellent resistance to water hammer, making it ideal for high-pressure steam mains, process equipment, and heating coils.
Key Specifications
- Model: 811-3/4-125
- Connection Size: 3/4″ NPT
- Maximum Allowable Pressure (MAP): 125 PSI
- Orifice Size: 1/8″
- Body Material: Cast Iron
- Operating Principle: Inverted Bucket
- Series: Armstrong International Series 811
Features & Benefits
- Cast iron body construction provides long-lasting durability in high-pressure steam environments
- Inverted bucket mechanism offers reliable, continuous condensate discharge with minimal steam loss
- 3/4″ NPT connections for straightforward installation into standard steam piping
- 1/8″ orifice sizing optimized for efficient condensate and air removal at rated pressures
- Resistant to water hammer — ideal for steam mains and high-pressure process lines
- Simple internal design reduces maintenance requirements and extends service life
- Backed by Armstrong International’s decades of steam system engineering expertise
Typical Applications
- Steam distribution mains and branch lines
- Process heating equipment and heat exchangers
- Unit heaters and heating coils
- Commercial and industrial steam systems up to 125 PSI
Why Choose Armstrong International Series 811?
Armstrong International is a globally recognized leader in steam system solutions. The Series 811 Cast Iron Inverted Bucket Steam Trap is designed to minimize energy waste, prevent condensate backup, and protect downstream equipment — all while delivering the low-maintenance reliability that facility managers and mechanical contractors demand.
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