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Windage trays are meant to prevent this sort of parasitic loss from oil splashing onto the crank and to shield the sump oil from windage effects. Many trays have scraper louvers built into them that strip away oil from the windage cloud.
Fixed valve trays offer improvement over sieve trays with superior fouling resistance and turndown capabilities. Turndown ratios up to 3:1 can be achieved with a proper tray design. When range of operation is not critical the fixed valve tray provides the best balance between cost and performance for conventional trays. Sieve This mass transfer device is the only tray that is suitable for both vapor/liquid and liquid/liquid contacting. As a fixed orifice-contacting device, the sieve tray is also one of the most economical trays because it does not have separate valves. It is used when turndown is limited to 2:1 and fouling is not a concern.