Typical application of the rectangular floating valve tray in revamping of fractopmatpr for quality upgrading of distillate cuts and enhancement of processing capacity were introduced.

Development and study of B-type directed valve trays;

In order to have reliable referenced data for selecting the height of floating valves when directed trapezoidal valve trays were applied in industry,the experiment on the structure parameter of which was studied.

The hydrodynamics of the new employed gradient ringent trapezoidal valve trays are experimentally studied with the air-water system in a 500 mm×500 mm quadrate column.

In comparison with the traditional float valve tray, the new tray had lower pressure drop (80-100Pa lower before valve fully opening and 300-400Pa lower after valve fully opening); weeping was about 10% less; the tray efficiency was about 10% higher; and flow guide function was obvious.

The FORGRAN Program, flow chats and illutration for calculation of technological design and hydraulics check of the HTV-type float valve tray were given.