Movable Valve Trays

Movable valve trays are currently the most commonly used type of tray. It is characterized by high capacity and separation efficiency, which is realized over a large variety of mass transfer applications.

In order to prevent the liquid flowing through under insufficient steam load, hinged lids are attached to the holes. These lids are pushed upwards at sufficient steam load in the column by the pressure of the steam and the steam can flow through the holes and the liquid. The pressure of the steam then prevents the liquid from flowing through the holes. If the steam load decreases, then the hinged lids close and thus prevent a drainage of the liquid.