Find a product
400 Series Inverted Bucket Steam Traps
Forged chrome-moly steel for vertical installation
For pressures to 1,000 psig (69 bar) . . .
Capacities to 20,000 lb/hr (9072 kg/hr)
Armstrong offers its 400 Series forged chrome-moly steel inverted bucket traps for vertical installation with a choice of screwed, socketweld or flanged connections.
A unique leverage system multiplies the force provided by the bucket to open the valve against system pressure. The mechanism is free-floating and has no fixed pivots to create wear or friction.
Because the mechanism is located at the top of the trap, no dirt can collect on the orifice. Small particles of dirt are held in suspension until discharged by the full differential purging action when the bucket sinks, pulling the valve off the seat.
The discharge orifice is surrounded by a water seal, which prevents live steam loss. Automatic air venting is provided by a small vent hole in the bucket. This provides continuous automatic air and CO2 venting at steam temperature.
Inverted bucket traps drain continuously, although discharging intermittently, allowing no condensate backup. They are also resistant to water hammer.Request a Quote
Installation and Maintenance
Armstrong Steam Trap Inverted Bucket Service Guide – Installation and Maintenance (PDF)
Pressure Change Assembly – Installation and Maintenance (PDF)
“Series 300, 400, 411-G, 5000 & 6000 Inverted Bucket Steam Traps” – Installation and Maintenance (PDF)