B Series Float & Thermostatic Steam Traps

Cast iron for horizontal installation, with thermostatic air vent

For pressures from vacuum to 30 psig (2 barg) . . .
Capacities to 8 900 lb/hr (4 037 kg/hr)

Armstrong B and BI Series F&T traps combine high standards of performance and long life with economy. They are ideal for heating service where continuous drainage with high air-venting capacity is required.

Due to the wide use of vacuum returns in systems of this type, the thermostatic air vent element is charged to give it the capability of compensated response to the pressure-temperature curve of steam at any pressure from less than 20" (500 mm) Hg vacuum to 30 psig (2 bar) gauge. B and BI Series F&T traps will vent air slightly below steam temperature throughout this entire range of operation.

All B Series traps, except the 1/2" (15 mm) and 3/4" (20 mm), have inlet connections on both sides of the body to provide flexibility in piping. The BI Series F&T traps in sizes 1/2" (15 mm), 3/4" (20 mm) and 1" (25 mm) feature the convenience of in-line connections with the same internals as the B Series.