Closure elements for plates of fluid exchange columns

Claim 1

A PLATE FOR A FLUID EXCHANGE COLUMN, SAID PLATE HAVING AN UPPER SURFACE THEREOF WITH A PLURALITY OF APERTURES THEREIN, A CLOSURE ELEMENT FOR EACH SAID APERTURE, EACH SAID ELEMENT COMPRISING A CAP PORTION HAVING A PERIPHERY OF SUBSTANTIALLY THE SAME SHAPE AS SAID APERTURE BUT OF LARGER DIMENSIONS, A PLURALITY OF CORRUGATIONS IN A MARGINAL PORTION OF SAID CAP PORTION EXTENDING ALONG THE ENTIRE PERIPHERY THEREOF DEFINING LOW PORTIONS WITH CRESTS THEREBETWEEN, SAID CRESTS EXTENDING ABOVE THE UPPER SURFACE OF SAID CAP PORTION, SAID LOW PORTIONS DEPENDING FROM THE LOWER SURFACE OF SAID CAP PORTION AND RESTING ON THE UPPER SURFACE OF SAID PLATE ADJACENT SAID APERTURE, A PLURALITY OF TEETH-LIKE GUIDE MEANS ATTACHED TO AND DEPENDING FROM SAID CAP PORTION AND PASSING THROUGH SAID PLATE, SAID GUIDE MEANS BEING EFFECTIVE TO GUIDE SAID CAP FOR VERTICAL MOVEMENT, MEANS ON SAID GUIDE MEANS FOR LIMITING THE VERTICAL MOVEMENT OF SAID CAP, SAID CRESTS BEING SPACED FROM SAID PLATE SURFACE TO FORM TOGETHER WITH SAID TEETH-LIKE GUIDING MEANS, A PLURALITY OF PASSAGEWAYS FOR FLUID FLOW THROUGH SAID APERTURE FROM BELOW TO ABOVE SAID PLATE, SAID PASSAGEWAYS ACTING AS MEANS TO CREATE TURBULENCE IN SIAD VAPOR FLOW AND CAUSE A MULTIPLICITY OF SEPARATE VAPOR JETS TO BE DISCHARGED SUBSTANTIALLY FLUSH WITH THE UPPER SURFACE OF SAID PLATE.