| 摘要 |
<p>A shutter-carrier bell (1) is described, adapted to be assembled on a plate valve (3) installed on a hole (5) obtained on a duct (7), the bell (1) being equipped with at least one rod (9) centrally sliding inside the bell (1) and having a lower end cooperating with at least one shutter (11) of the duct (7) and an upper end cooperating with un actuating device (13) that drives a positioning of the shutter (11) inside the duct (7) through at least one. control handle (15), and being further equipped with a rotation-preventing system of the shutter (11) cooperating with the control handle (15), such rotation-preventing system being adapted to prevent a rotation of the shutter (11) with respect to the axis of the duct (7).</p> |
