990 Series Inverted Bucket Steam Traps


For pressures to 600 psig (41 barg) . . .
Capacities to 4 400 lb/hr (2 000 kg/hr)

Armstrong offers two sizes of cast steel inverted bucket traps with in-line horizontal pipe connections and integral strainers 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, which 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.

970 and 990F Series Inverted Bucket Steam Trap have replaced the 980 Series.  Please consult the Resource Library for 980 Series information & documentation.