Sludge discharging centrifugal separators

Claim 1

IN A CENTRIFUGAL SEPARATOR HAVING A CENTRIFUGAL BOWL WITH PERIPHERAL SLUDGE DISCHARGE OPENINGS AND AN AXIALLY MOVABLE SLEEVE VALVE, MOVABLE BETWEEN A POSITION OPENING AND A POSITION CLOSING SAID SLUDGE DISCHARGE OPENINGS, THE IMPROVEMENT WHICH COMPRISES AN INSERT MEMBER DEFINING AN END SURFACE OF THE BOWL INTERIOR AND POSITIONED TO DEFINE A FREE SPACE BETWEEN IT AND THE ADJACENT WALL PORTION OF THE BOWL, A FLANGE CONNECTED TO SAID SLEEVE VALVE FOR MOVEMENT THEREWITH EXTENDING INWARDLY WITHIN SAID FREE SPACE DIVIDING THE SAME INTO AN OPENING CHAMBER AND A CLOSURE CHAMBER, MEANS FOR INTRODUCING LIQUID INTO SAID OPENING CHAMBER DURING CENTRIFUGAL OPERATION TO MOVE SAID SLEEVE VALVE TO OPENING POSITION AND MEANS FOR THE REMOVAL OF LIQUID FROM SAID OPENING CHAMBER, SAID CLOSURE CHAMBER CONTAINING FLOWABLE MATERIAL THEREWITHIN AND HAVING MEANS FOR SEALING SAID CLOSURE CHAMBER AGAINST THE FLOW AND OVERFLOW OF SAID MATERIAL THEREFROM INTO SAID OPENING CHAMBER AND FOR SEALING SAID CLOSURE CHAMBER AGAINST THE COMPLETE OUTWARD FLOW OF SAID MATERIAL THEREFROM BOTH AT STANDSTILL AND UNDER CENTRIFUGAL ACTION WHEREBY A GIVEN MASS OF A FLOWABLE CLOSURE MATERIAL WILL BE MAINTAINED THEREIN BOTH AT STANDSTILL AND DURING OPERATION AND IN ANY POSITION OF MOVEMENT OF SAID SLEEVE VALVE FOR CLOSING ACTUATION OF SAID SLEEVE VALVE, SAID CLOSURE CHAMBER DEFINING BETWEEN THE FLANGE AND THE ADJACENT WALL PORTION OF THE BOWL AN OUTWARDLY CONFINED STORAGE SPACE HAVING, WHEN SAID SLEEVE VALVE IS IN CLOSING POSITION, A RADIALLY WIDE AND AXIALLY NARROW DIMENSIONED PERIPHERAL ZONE COMPLETELY OCCUPIED BY SAID FLOWABLE MATERIAL DURING CENTRIFUGAL OPERATION