All Stainless Steel
Product Overview
Armstrong 800/811/812/813 Inverted Bucket Steam Trap is a high-efficiency drainage device constructed from cast iron, specifically designed for horizontal installation. As one of the most reliable types of steam traps, the inverted bucket design enables efficient condensate discharge for various steam equipment. This series features long-lasting stable operation, significantly saving energy while reducing replacement and labor costs. All models are serviceable, further minimizing maintenance expenses.
The unique lever system amplifies the force generated by the bucket, ensuring smooth valve opening under system pressure. The free-floating mechanical structure has no fixed pivot points, avoiding wear and friction issues. Since the mechanical components are located at the top of the trap, the orifice does not accumulate debris. Fine particles remain suspended in the fluid and are expelled through full differential pressure blowdown when the bucket sinks and the valve lifts off its seat. A water seal around the orifice prevents fresh steam leakage, while a small vent hole in the bucket enables continuous automatic venting of air and CO₂ at steam temperature. Although this series operates with intermittent discharge, it achieves continuous drainage without condensate accumulation and provides water hammer resistance.
Technical Specifications
Maximum Operating Conditions
| Parameter | Value |
|---|---|
| Max Allowable Pressure for Vessel Design | 250 psig @ 450°F (17 bar @ 232°C) |
| Max Working Pressure (Model 800) | 150 psig (10 bar) |
| Max Working Pressure (Model 811-813) | 250 psig (17 bar) |
| Max Capacity | 4,400 lb/hr (2,000 kg/hr) |
Connection Types
- Threaded: NPT and BSPT
Material Specifications
| Component | Material |
|---|---|
| Body | ASTM A48 Class 30 Cast Iron |
| Internal Components | 304 Stainless Steel |
| Disc and Seat | 17-4PH Hardened Chrome Steel |
| Test Plug | Carbon Steel |
Optional Configurations
- Stainless steel internal check valve
- Thermostatic air vent bucket
- Stainless steel pop-out drain
- Probe connection
- Thermal drain
- Cleaning wire
Dimensions and Weight
| Model | Pipe Connection (in/mm) | Test Plug (in/mm) | Flange Dia. "A" (in/mm) | Height "B" (in/mm) | Face-to-Face "C" (in/mm) | Bottom to C Inlet "D" (in/mm) | Bolts | Weight (lb/kg) |
|---|---|---|---|---|---|---|---|---|
| 800 | 1/2, 3/4 / 15, 20 | 1/4 / 6 | 3-3/4 / 95.2 | 5-7/16 / 138 | 5 / 127 | 2-3/4 / 70 | 6 | 5 (2.3) |
| 811 | 1/2, 3/4, 1 / 15, 20, 25 | 1/4 / 6 | 3-3/4 / 95.2 | 6-7/8 / 175 | 5 / 127 | 4-1/4 / 108 | 6 | 6 (2.7) |
| 812 | 1/2, 3/4 / 15, 20 | 1/2 / 15 | 5-5/8 / 143 | 9-1/16 / 230 | 6-1/2 / 165 | 5-3/8 / 137 | 6 | 15 (6.8) |
| 813 | 3/4, 1 / 20, 25 | 3/4 / 20 | 7 / 178 | 11-3/4 / 298 | 7-3/4 / 197 | 7-1/32 / 179 | 6 | 27-1/2 (12.5) |
Note: Model 800 cannot be equipped with both thermostatic air vent bucket and check valve simultaneously
Capacity Data
Model 800 Capacity
Model 811 Capacity
Model 812 Capacity
Model 813 Capacity
Product Specification
Inverted bucket steam trap, cast iron construction, with continuous air venting at steam temperature, featuring free-floating stainless steel mechanism with orifice located at the top of the trap.
Ordering Information
When ordering, please specify:
- Model number
- Size and type of pipe connection
- Actual maximum working pressure or orifice size
- Required optional configurations
For detailed certification drawings, refer to CD #1000.
- 800/811/812/813 series are side-in, side-out steam traps
- Model suffix explanation: "CV" indicates internal check valve, "T" indicates thermostatic air vent bucket
Notes
- Product design, materials, weight, and performance specifications are approximate and subject to change without prior notice
- All technical information is based on the latest published version
