Armstrong float and thermostatic steam traps
Armstrong float and thermostatic trap is a mechanical trap that operates on both density and temperature principles. The float
valve operates on the density principle: a lever connects the ball float to the valve and seat. Once condensate reaches a certain
level in the trap the float rises, opening the orifice and draining condensate. A water seal formed by the condensate prevents
live steam loss.
Since the discharge valve is under water, it is not capable of venting air and non-condensables. When the accumulation
of air and non-condensable gases causes a significant temperature drop, a thermostatic air vent in the top of the trap
discharges it. The thermostatic vent opens at a temperature a few degrees below saturation so it’s able to handle a large
volume of air – through an entirely separate orifice – but at a slightly reduced temperature.
Armstrong F&T traps provide high air-venting capacity, respond immediately to condensate and are suitable for both industrial and HVAC applications.
