Control valve for installation into a pipeline

A fluid control valve comprising:

• a housing,
• a valve duct arranged in the interior of the housing and extending in a predetermined flow direction, said duct including a mouth fashioned as a valve seat with a curved valve seat surface,
• a valve body provided with a curved valve body surface conforming in shape to said curved valve seat surface and an inner surface facing away from said valve body surface which is configured so that an apex line of said inner surface lies in an extension of an inner surface of said valve duct when said valve body is in a completely open position,
• valve body pivot means supporting said valve body for movement about a pivot axis in such a manner that said valve seat surface and said valve body surface sealingly engage one another when said valve body is in a closed position, said pivot axis being spaced from the center of curvature of said valve seat surface and being located below the axis of the cylinder when the valve body is in the closed position with pivotal movement from said closed position being in an upward direction, said valve body pivot means being mounted in an extension of the valve duct which is spaced from the valve seat surface such that the valve duct and valve body form a valve unit, and
• mounting means for exchangeably attaching said valve unit to said housing,
• wherein a sleeve serves as the extension of the valve duct, said sleeve extending from said valve duct to the end of said housing which is downstream of said valve seat, and
• wherein said sleeve is provided with a longitudinal slot adapted to the width of the valve body for accommodating pivotal movement of the valve body.

A fluid control valve comprising:

• a housing,
• a valve duct arranged in the interior of the housing and extending in a predetermined flow direction, said duct including a mouth fashioned as a valve seat with a curved valve seat surface,
• a valve body provided with a curved valve body surface conforming in shape to said curved valve seat surface and having an inner surface facing away from the valve body surface which is configured so that an apex line of said inner surface lies in an extension of an inner surface of said valve duct when said valve body is in a completely open position,
• valve body pivot means supporting said valve body for movement about a pivot axis in such a manner that said valve seat surface and valve body surface sealingly engage one another when said valve body is in a closed position, said pivot axis being spaced from the center of curvature of the valve seat surface, said valve body pivot means being mounted in an extension of the valve duct which is spaced from the valve seat surface such that said valve duct and valve body form a valve unit, and
• mounting means for exchangeably attaching said valve unit to said housing including an external thread on said valve duct which is threadably engageable with a threaded bore of an end wall of the housing,
• wherein a sleeve serves as the extension of the valve duct, said sleeve extending from said valve duct to the end of said housing which is downstream of said valve seat, and
• wherein said sleeve is provided with a longitudinal slot adapted to the width of the valve body for accommodating pivotal movement of the valve body.

A fluid control valve comprising:

• a housing,
• a valve duct arranged in the interior of the housing and extending in a predetermined flow direction, said duct including a mouth fashioned as a valve seat with a curved valve seat surface,
• a valve body provided with a curved valve body surface conforming in shape to said curved valve seat surface,
• valve body pivot means supporting said valve body for movement about a pivot axis in such a manner that said valve seat surface and valve body surface sealingly engage one another when said valve body is in a closed position, said pivot axis being spaced from the center of curvature of said valve seat surface, said valve body pivot means being mounted in an extension of the valve duct which is spaced from the valve seat surface such that said valve duct and valve body form a valve unit,
• mounting means for exchangeably attaching said valve unit to said housing including an external thread on said valve duct which is threadably engageable with a threaded bore of an end wall of the housing, and
• a centering ring threaded onto the external thread of the valve duct, said centering ring tapering in its projecting zone from a predetermined pipe diameter to the diameter of the valve duct.

A fluid control valve comprising:

• a housing,
• a valve duct arranged in the interior of the housing and extending in a predetermined flow direction, said duct including a mouth fashioned as a valve seat with a curved valve seat surface,
• a valve body provided with a curved valve body surface conforming in shape to said curved valve seat surface,
• valve body pivot means supporting said valve body for movement about a pivot axis in such a manner that said valve seat surface and valve body surface sealingly engage one another when said valve body is in a closed position, said pivot axis being spaced from the center of curvature of said valve seat surface, said valve body pivot means being mounted in an extension of the valve duct which is spaced from the valve seat surface such that said valve duct and valve body form a valve unit,
• mounting means for exchangeably attaching said valve unit to said housing, and
• a sleeve serving as the extension of the valve duct, said sleeve extending from said valve duct to the end of said housing which is downstream of said valve seat, said sleeve being provided with a longitudinal slot adapted to the width of the valve body for accommodating pivotal movement of the valve body,
• wherein the housing is provided with flanges at its end faces, and
• clamping bolts for clamping said flanges of said housing between pipe flanges of pipes for accommodating flow of fluid to and from said valve duct.

A fluid control valve comprising:

• a housing,
• a valve duct arranged in the interior of the housing and extending in a predetermined flow direction, said duct including a mouth fashioned as a valve seat with a curved valve seat surface in the shape of a portion of a cylinder curving convexly against a direction of flow with a center of curvature at an axis of the cylinder,
• a valve body provided with a curved valve body surface conforming in shape to said curved valve seat surface,
• valve body pivot means supporting said valve body for movement about a pivot axis extending parallel to the axis of the cylinder in such a manner that said valve seat surface and valve body surface sealingly engage one another when said valve body is in a closed position, said pivot axis being spaced from the center of curvature of said valve seat surface and being in a fixed position during movements of said valve body from said closed position to an open position out of sealing engagement with said valve seat surface, said valve body pivot means being mounted in an extension of the valve duct which is spaced from the valve seat surface such that said valve duct and valve body form a valve unit, and
• mounting means for exchangeably attaching said valve unit to said housing,
• wherein the valve duct is cylindrical and has an inner diameter D, with the spacing in the flow direction from said pivot axis to a point of intersection of a radius R of the valve seat surface and the diameter D being in the range of 1/3 to 2/3 D.