Which Koch-Glitsch tray has the greatest flexibility?
Highest flexibility can be obtained by slotted bubble cap trays and the Koch-Glitsch A-1 Ballast tray. The top of the slots on a bubble cap tray represent less submergence than normally used on a valve tray, which permits a more even bubbling area at low rates. The wide stance of the Ballast plate of the A-1 unit permits it to operate in the tilted position. In the tilted position, the unit passes less vapor than if it were fully open. All other type valve units are a) shut, b) open or c) moving from one position to the other. As a result, at comparable vapor rates, the A-1 Ballast tray has a larger area active than other standard valve trays.
