A movable shutter for a fluid conduit including two half-bodies consisting of a tube that forms a conduit, to the ends of which are affixed a flange and a plate having a bearing surface; a gate with a body defined by two longitudinal surfaces located opposite the bearing surfaces, which gate is mounted movably between the bearing surfaces, between a closed position and an open position; and a locking mechanism suitable for keeping the plates in a position in which they are either separated or close together, wherein at least one protruding element is provided on at least one of the bearing surfaces or on at least one of the longitudinal surfaces, such that if the gate is not properly positioned, the protruding element forms an obstacle that prevents the locking mechanism from keeping the plates in the position in which they are close together.

A movable shutter for a fluid conduit including two half-bodies consisting of a tube that forms a conduit, to the ends of which are affixed a flange and a plate having a bearing surface; a gate with a body defined by two longitudinal surfaces located opposite the bearing surfaces, which gate is mounted movably between the bearing surfaces, between a closed position and an open position; and a locking mechanism suitable for keeping the plates in a position in which they are either separated or close together, wherein at least one protruding element is provided on at least one of the bearing surfaces or on at least one of the longitudinal surfaces, such that if the gate is not properly positioned, the protruding element forms an obstacle that prevents the locking mechanism from keeping the plates in the position in which they are close together.

A swinging device for spectacle blinds where the swinging device includes a case having a pair of side members connected to a bottom member and first and second shafts rotatably connected to the case. A first gear mounted on the first shaft engages a second gear mounted on the second shaft. A drive handle assembly is connected to the first shaft to impart rotation of the first shaft. A spectacle blind holder is mounted on an end of the second shaft. The spectacle blind holder is arranged and designed to securely hold the spectacle blind. A base assembly has an upper portion connected to the case and a lower portion for mounting to piping.

A swinging device for spectacle blinds where the swinging device includes a case having a pair of side members connected to a bottom member and first and second shafts rotatably connected to the case. A first gear mounted on the first shaft engages a second gear mounted on the second shaft. A drive handle assembly is connected to the first shaft to impart rotation of the first shaft. A spectacle blind holder is mounted on an end of the second shaft. The spectacle blind holder is arranged and designed to securely hold the spectacle blind. A base assembly has an upper portion connected to the case and a lower portion for mounting to piping.

The invention relates to a valve apparatus for a gaseous medium, having a valve body with an opening which can be flowed through in the flow direction by the medium and is delimited by way of a circumferential face in the valve body. An orifice is arranged in a gap within the valve body such that it can be displaced perpendicularly with respect to the flow direction, in order to influence the flow through the opening. The gap divides the circumferential face into an inlet-side and an outlet-side part circumferential face. The outlet-side part circumferential face has a first edge which faces the orifice and a second edge which faces away from the orifice. The first edge is assigned at least one geometrical feature which is configured to make the first edge non-uniform.

The invention relates to a valve apparatus for a gaseous medium, having a valve body with an opening which can be flowed through in the flow direction by the medium and is delimited by way of a circumferential face in the valve body. An orifice is arranged in a gap within the valve body such that it can be displaced perpendicularly with respect to the flow direction, in order to influence the flow through the opening. The gap divides the circumferential face into an inlet-side and an outlet-side part circumferential face. The outlet-side part circumferential face has a first edge which faces the orifice and a second edge which faces away from the orifice. The first edge is assigned at least one geometrical feature which is configured to make the first edge non-uniform.

A line blind valve installed between pipes to open or block a pipeline, in which the line blind valve includes: a valve body having opening portions formed at front and rear sides thereof, respectively; a front sheet formed from the opening portion of the front side toward an inside of the valve body, and a rear sheet formed from the opening portion of the rear side toward the inside of the valve body; an opening blind installed during opening of the pipeline and a blocking blind installed during blocking of the pipeline, the opening and blocking blinds being inserted between the front and rear sheets; and a gear unit coupled to the rear sheet in a threaded manner, and configured to press the opening blind or the blocking blind toward the front sheet by moving forward so that the opening or the blocking blind is fixed to the front sheet, and is sealed.

A line blind valve installed between pipes to open or block a pipeline, in which the line blind valve includes: a valve body having opening portions formed at front and rear sides thereof, respectively; a front sheet formed from the opening portion of the front side toward an inside of the valve body, and a rear sheet formed from the opening portion of the rear side toward the inside of the valve body; an opening blind installed during opening of the pipeline and a blocking blind installed during blocking of the pipeline, the opening and blocking blinds being inserted between the front and rear sheets; and a gear unit coupled to the rear sheet in a threaded manner, and configured to press the opening blind or the blocking blind toward the front sheet by moving forward so that the opening or the blocking blind is fixed to the front sheet, and is sealed.

A line blind valve includes: a valve body formed with an opening at each of a front side and a rear side thereof; a fixed pipe fixedly provided on the front side to be in a shape inserted in the opening of the front side; a moving pipe provided on the rear side by being inserted into the opening of the rear side, and movable in a direction of a pipeline, with threads formed on an outer circumferential surface thereof; a blind provided between the fixed pipe and the moving pipe to open or block the pipeline by moving upward or downward; and a drive assembly including a gear set engaged with the threads and configured to press the moving pipe toward the blind to sealingly fix the moving pipe, and a drive unit coupled to the gear set to control a rotation direction of the gear set.

A line blind valve includes: a valve body formed with an opening at each of a front side and a rear side thereof; a fixed pipe fixedly provided on the front side to be in a shape inserted in the opening of the front side; a moving pipe provided on the rear side by being inserted into the opening of the rear side, and movable in a direction of a pipeline, with threads formed on an outer circumferential surface thereof; a blind provided between the fixed pipe and the moving pipe to open or block the pipeline by moving upward or downward; and a drive assembly including a gear set engaged with the threads and configured to press the moving pipe toward the blind to sealingly fix the moving pipe, and a drive unit coupled to the gear set to control a rotation direction of the gear set.