Our QST and QSB series of rotary screw compressors are equipment with large-diameter, high-efficiency rotors.

Large rotors mean the QST and QSB can run at slower speeds for extended airend life and quiet, economical operation. For added economy, these units feature continuous run, "load/no load" control systems.

The QST and QSB are completely user-friendly and have been designed with your convenience in mind. For instance, the QST offers the system flexibility of a tank-mounted unit, while the QSB base-mount is ideal for installations where space is tight and those where air storage is not a concern. We've designed the QST/QSB with fewer external piping connections, so maintenance concerns are reduced. Easy serviceability is assured with quick-change separators, quick-release cabinet latches, and convenient access to routine maintenance areas.

The QST and QSB are manufactured at Quincy's facility in Bay Minette, Alabama, One of the most technologically advanced compressor plants in the world. They are precision-engineered, quality-built, and ready to shine in virtually every application. The QST and QSB are two more reasons why Quincy compressors are undeniably the world's finest.

Quality Features Performing Quality Functions

• Easy-to-read instrument panel - features large, 2-1/2" dampened movement analog gauges for air discharge pressure, discharge air/oil temperature, and oil injection temperature. Other standard indicators include hour meter, power-on-light, and selector switch.
• Continuous run control - with total closure inlet valve minimizes operation costs by incorporation load/no load controls.
• Combination over/under aftercooler and fluid cooler - is designed to capture maximum cooling air flow, allowing operation in ambient temperatures up to 115 degrees f. with a 15 degree f. appoach. single piece design allows easy, efficient cleaning.
• Aftercooler with moisture separator/trap - removes condensation from compressed air.
• Unique separation method - uses air directional changes, centrifugal separation, and coalescing pre-seraration to keep lubricant carryover under 1 ppm (see below)
• Quick-change separator system - allows replacement of the separator elements in minutes, without disconnectiong discharge piping or scavenger tubing.

Are You comparing apples to oranges when it comes to separation systems?

Lubricant carryover can be measured in two ways. The first method measures the lubricant carryover downstream from the aftercooler, moisture separator and drain trap. The amount of carryover is normally stated in ppm(parts per million) and is typically in the 3-5 ppm range. Most compressor manufacturers publish carryover rates based on this information, and while it is a relatively accurate measure of downstream lubricant carryover(relative because the effectiveness of the moisture separator and trap at lubricant removal will vary with only 1/3 to 1/4 of the actual lubricant passing through the separation system).

The second method, lubricant make-up, is the method Quincy has traditionally used and measures the total amount of lubricant lost in both the downstream air system and through the moisture separator and trap. This method provides a much more accurate account of lubricant loss.

Don't be misled. Quincy's QST and QSB products use a unique, highly efficient separation system and molded media separator element (see left) that keeps lubricant make-up under 3 ppm and, remarkably, lubricant carryover under 1 ppm. So be sure you're comparing apples to apples. When we say low lubricant carryover, that's exactly what we mean-by-anyone's definition.