Cast Iron
Armstrong EM forged steel inverted bucket steam trap combines the most reliable steam trap operating principle known in a body, which can be opened for easy maintenance. It offers high resistance to wear, corrosion, and water hammer.
The free-floating guided lever valve mechanism is "frictionless" with all wear points heavily reinforced. All working parts are stainless steel; the valve and seat are hardened chrome steel, individually ground and lapped.
Features and Operation
- Freedom from dirt problems: Condensate flow under the bottom edge of the bucket keeps sediment and "sludge" in suspension until discharged by full differential purging action. The valve orifice opens wide and closes tight. There is no buildup of dirt, and no close clearances to be affected by scale. Under normal conditions of reasonably "clean steam", a strainer is not necessary. However, this is left to the user's discretion.
- Air handling ability: A vent in the bucket top provides continuous automatic air and CO2 venting with no cooling leg and prevents air binding. A wiggle wire ensures a clean vent hole at all times. Any steam passing through the vent is condensed and discharged as liquid.
- No steam loss: Steam does not reach the water-sealed valve. Inverted bucket traps require no adjustment and no live steam to operate.
Materials
| Component | Material |
|---|---|
| Body | Forged carbon steel |
| Internals | All stainless steel – 304 |
| Valve and seat | Hardened chrome steel – 440F |
| Gasket | Spiral wounded graphite |
| Bolts | 24 CrMo5 |
Options
- Bucket vent scrubbing wire for heavy dirt/oil conditions
- For superheated steam, stellited valve and seat are advised
Dimensions and Weights
Model EM Side Inlet, Side Outlet Trap (dimensions in mm)
| Pipe Connections | 1/2 in (15 mm) | 3/4 in (20 mm) | 1 in (25 mm) |
|---|---|---|---|
| "C" Face-to-Face (screwed & SW) | 92 mm | 92 mm | — |
| "CC" Face-to-Face (flanged ANSI CL150) | 171 mm | 178 mm | 184 mm |
| "CC" Face-to-Face (flanged ANSI CL300) | 178 mm | 187 mm | 197 mm |
| "D" Bottom to C Inlet | 189 mm | 189 mm | 189 mm |
| "B" Height (screwed & SW) | 210 mm | 210 mm | — |
| "BB" Height (flanged*) | 235 mm | 240 mm | 245 mm |
| Weight, screwed | 3.1 kg | 3.1 kg | — |
| Weight, flanged | 5.5 kg | 7.1 kg | 8.1 kg |
Maintenance
WARNING
Equipment under pressure - Operating temperature > 100°C. Make sure the trap is cold before handling!
Mechanism Adjustment
The mechanism should be adjusted as shown below. When correctly aligned, lever (B) can be moved sideways the same distance to the right as to the left. If guide pin (A) is not in the middle of the orifices, adjust by slightly hitting with a hammer.
Internals Maintenance
- Unscrew bolts (11) and nuts (10) and lift the cap (1). Body (2) can remain connected to the steam line.
- Clean or replace bucket (6) or mechanism (valve and seat) (3, 4 & 5).
- Replace gasket (7).
- Put the cap (1) back on the body (2) and screw bolts (11) and nuts (10).
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