Koch flexitrays

Fig. 16. Individual valve units used in valve plates (a) Koch Flexitray valve, courtesy of Koch Engineering Co. (b) GHtsch Ballast valve, courtesy of...

The columns pressure deserves special attention. The top of both columns is set at 0.066bar with a pressure drop per tray at 500 Pa, a conservative value for vacuum operation. The total pressure drop is accounted for in real stages with 75% overall efficiency. Koch flexitrays with 4 passes are adopted as internals, since these give smaller diameter. However, relatively large values are obtained, of 2.5 and 3.2 m for the bottom and top trays respectively, due to the high throughput and deep vacuum. 

Koch Engineering. Koch Flexitray Design Manual, Wichita, KS, 1964. 

Figure 12-2 A typical single-pass valve tray (Koch Flexitray, type T caps) with cross flow [by courtesy Koch Engineering Co.y Inc.y Wichita, Kansas].

Plates = Koch Flexitray-AF, Thermal condition of feed liquid at 148.9°F... 

Figure 13.7. Estimation of number of required liquid flow passes. (Derived from Koch Flexitray Design Manual, Bulletin 960, Koch Engineering Co., Inc., Wichita, Kansas, 1960.)...

Koch Flexitray Design Manual, Bulletin 960, Koch Engineering Co., Inc., Wichita, Kansas, 1960. 

Koch Engineering Company, Inc., Bulletin KT-5, Koch Flexitrays, Wichita, KS, 1968. 

Qlitsch valve tray, Stahl valve tray, Koch flexitray)... 

Valve disc with smooth or venturi tube shaped vapor entry guided in a cage mounted on the tray (Koch Flexitray, Stahl Varioflex-cap with valve disc)... 

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