While the valve tray dates back to the rivet type first used In 1922, many design
Improvements and innumerable valve types have been introduced in recent years.
Two types of valves are illustrated in Figure 7. These valves provide the following advantages:
1. Throughputs and efficiencies can be as high as sieve or bubble cap trays.
2. Very high flexibility can be achieved and turndown ratios of 4 to 1 can be obtained without having to resort to large pressure drops at the high end of the operating range.
3. Special valve designs with venturi shaped orifices are available for duties involving low pressure drops.
4. Although slightly more expensive than sieve trays, the valve tray is economical in view of its numerous advantages.
5. Since an operating valve is continuously in movement, the valve tray can be used for light to moderate fouling duties. APV has successfully used valve trays on brewery effluent containing waste beer, yeast and other materials with fouling tendencies.
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