Patent ID: 7913717

Claim:
A fast-acting gate comprising a drive in the form of a screw pair, sealing elements, a lid consisting of a flange and a bottom which is caved-in inwards a pipe, arresting and fixing elements, wherein arresting elements are made in the form of sectors inserted into a circular recess of the pipe when they are radially displaced, under the action of a drive nut, along the end face of the flange and a supporting ring of a sleeve which is welded to the inner surface of the bottom of the lid, and along clamping guiding-adjusting bolts mounted on the flange and the supporting ring of the sleeve through slots made on the sectors, the drive nut is embodied in the form of a truncated pyramid with lateral surfaces provided with T-slots which are responsive to inclined surfaces of contiguous butt ends of the sectors with T-shaped tenons; when the nut is moved in opposite direction, T-shaped tenons of the sectors pull them loose from a circular recess of the pipe by cheeks of T-slots thus forming a surface with the radius falling within outer radius of the lid flange; a gate lid is mounted on articulated joints with the possibility of adjusting its position with respect to a mounting seat into the pipe; the pipe is provided with recesses to accommodate seals of the lid, the flange and the sectors, wherein the last recess is made with the inclined surface which is responsive to the inclined contact surface on the upper side of the sectors; control markers are mounted on the sectors; a locking plate provided with a lever, said plate being lowered into a gap embodied between the sectors and locked the sectors by the action of a pneumatic cylinder rod in the presence of excessive pressure inside a closable pipe is mounted inside the lid; a protective casing is mounted on articulated joints on the side diametrically opposite to the hinge of the pipe lid.