Valve Trays

The valve trays are typically with the covers provided to the perforations of the sieve trays. The valves are either movable (conventional) or fixed. The valves provide extra resistance to the rising vapors, which are discharged laterally. This helps better interactions with the liquid on the tray and increases efficiency. Valve trays have better turndown.

Conventional Valve Tray
The valves are either round or rectangular in shape, which moves vertically up/down to create variable lateral openings for the vapors to bubble through the liquid pool. Increase in vapor energy will move the valve in upward direction and the valves sit on the deck when vapor energy is very low. The cage valves are with
the caging structure and a lighter movable disk which sits on the perforation. The disks provide lower pressure drop as it gives less resistance to the rising vapors.

These valve trays are also available with venturi option.

High Capacity Valve Tray
The fixed valve tray is a valve tray whose valve units are fixed in the fully open position and is a low-cost stationary assembly which imitates the shape of valve. They have better turn-down ratio than sieve trays. The absence of the moving disk eliminates wear and sticking, but at the expense of turndown as compared
to other valve trays.

The valve can be flat-dome shaped, triangular or rectangular.