Patent ID: 8568653

Claim:
A sealing valve arrangement for a shaft furnace charging installation, said arrangement comprising: a shutter that cooperates with a valve seat; a dual-motion shutter-actuating device for moving said shutter between a closed position in sealing contact with the valve seat and an open position remote from the valve seat, said shutter-actuating device being configured to confer to said shutter a superposition of a first rotation about a first axis and a second rotation about a second axis that is substantially parallel and offset with respect to said first axis, said shutter-actuating device comprising: a primary tilting arm connected to a first tilting shaft that defines said first axis and is equipped with bearings to rotatably support said primary tilting arm on a stationary structure, a secondary tilting arm connected to a second tilting shaft that defines said second axis and is equipped with bearings that rotatably support said secondary tilting arm on said primary tilting arm, said secondary tilting arm carrying said shutter; and a mechanism configured to impart rotation about said second axis to said secondary tilting arm when said primary tilting arm rotates about said first axis; wherein said first tilting shaft is configured as a hollow sleeve shaft and said shutter-actuating device comprises a reference rod extending through said first tilting shaft, said reference rod having a distal end portion to be connected to a stationary structure and a proximal end portion with a reference member, said mechanism having a driven side that is in engagement with said reference member.