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[ASH25320]

Can somebody explain the difference between the valve VS bubble cap trays, thier effacacy for particular application? Thanks in advance...

[siretb]

A bubble cap is a static device, with no moving part. In a bubble cap tray you have chemneys covered with a cap. A valve tray is a dynamic devive, where the valve can be open , closed or even half opened. So when the flowrate increases more and more valves will open. The net effect is that the turndown ratio of the tray is higher.
Nowadays, seldom will one use bubble caps. Valve trays (or sometimes the good old plain sieve tray ) are perferred), when packing is not selected.
You may pay a visit to a supplier's web site (Kogh Glitsch (www.koch-glitsch.com) , ...) to see what a valve tray looks like.
Bubble caps are quite efficient, and are suitable when a high liquid holdup is desired (chemical reactionin liquid phase)