Wright-Austin Gas Liquid Separator Traps

Cast Iron separators with integral drain trap

The Type ST separator combines a Wright-Austin Type T separator with a Type 90-AC float drain trap into a compact, single-body design that simplifies installation.

ST separators (separator traps) remove entrained liquid and solids larger than 10 microns from compressed air and saturated steam with 99% efficiency. Air or steam enters the separator and forms a strong vortex. Centrifugal force propels droplets and particles to the vessel wall. The exit nozzle draws from the low-velocity center of the vortex, so only droplets finer than 10 microns exit.

Droplets collect in the float drain trap chamber at the bottom. The hollow stainless steel float rises with condensate level and lifts the valve off its seat. System pressure pushes condensate out. When the float drops, the valve reseats. A condensate barrier is always present, ensuring zero loss of compressed air or steam during drainage.

A patented Vortex Containment Plate (VCP) prevents re-entrainment. Removing the bottom flange releases the trap mechanism for inspection and repair. All drain trap components are rust-proof stainless steel with a non-magnetic 18-8 valve and seat.

The ST design is available only in cast iron and is typically used for air and steam. For higher pressures or other process gases, a custom fabricated separator with a separate cast steel or stainless steel trap is required. ST separators cannot carry an ASME Code Stamp or CRN.

The low-profile version is the 31L-ST. The standard ST has condensate capacity equivalent to 40% of its maximum rated weight flow; the 31L-ST is limited to about 5%. Use our sizing calculator / inquiry form to compare capacities.

Outline Drawings

Specifications, Parts & Installation

ST Part Numbers

31L-ST Part Numbers