Changeover valves for regenerative ovens

Claim 1

A LIQUID REGENERATOR-REVERSING DIP SEAL VALVE COMPRISING: A HOUSING HAVING A GENERATOR CONNECTION FOR INFLOW OF GAS THERETO FROM A REGENERATOR, AN OUTLET CONNECTION FOR OUTFLOW OF GAS FROM THE HOUSING, AN ANNULAR CUP-AROUND THE OUTLET CONNECTION, DIP VALVE FOR THE ANNULAR CUP, AND AN ANNULAR FLOAT IN THE CUP DEPRESSIBLE BY THE DIP VALVE ON IMMERSION OF THE DIP VALVE IN THE CUP TO SEAL OFF THE OUTLET CONNECTION TO GAS FLOW THERETO FROM THE HOUSING, AND CHARACTERIZED BY A HOUSING CONSTRUCTION OF THE FLOAT TO RISE TO A LEVEL ABOVE THE INLET EXTREMITY OF THE OUTLET CONNECTION AND BY AN UPPER SURFACE FOR THE FLOAT THAT EXTENDS OBLIQUELY SUBSTANTIALLY ENTIRELY ACROSS THE CUP IN A DIRECTION DOWNWARDLY TO THE INLET EXTREMITY OF THE OUTLET CONNECTION FROM A HIGHER LEVEL ABOVE SAID EXTREMITY, WHEN THE FLOAT IS EMERGENT IN LIQUID IN THE CUP, IN THE OPEN POSITION OF THE DIP VALVE, FOR OFF-FLOW ENTRAINMENT OF SOLID CONSTITUENTS THAT MAY DEPOSIT ON THE TOP SURFACE OF THE FLOAT INTO THE OUTLET CONNECTION, BY GAS FLOW THROUGH THE HOUSING FROM THE REGENERATOR CONNECTION TO THE OUTLET CONNECTION, AND A DOWNWARDLY NARROWING LOWER TROUGH PORTION FOR THE CUP UNDERNEATH THE FLOAT, COMBINED WITH A LIQUID OUTLET FROM THE CUP AT THE LOWER NARROWER TROUGH PORTION THEREOF, FOR HIGH LIQUID SPEED FLUSHING-OUT OF SOLIDS THAT MAY NEVERTHELESS COLLECT BENEATH THE FLOAT IN THE CUP NOTWITHSTANDING THE ACTION OF THE OBLIQUE TOP SURFACE FOR THE FLOAT, SAID LIQUID OUTLET