US 4,071,221 AGranted

Isolation valve affording an absolute tightness towards the exterior and between the seat and the shutting member

AssigneeNuovo Pignone S.p.A.

InventorsNicola Di Sciascio, Michele Vinci

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Abstract

An absolutely tight valve is disclosed, especially suitable for nuclear installations where safety is of paramount importance. The valve provides a tight seal by means of a wheel having a set of projecting spokes, the wheel being placed over the shutter disk and integral therewith. Inclines integral with the valve body cooperate with the spoke ends in a wedging engagement, and a set of cup springs discharge the reactive forces and secure a tight seal.

Claims3

Dependent claims

A gate adapted particularly for sealing off large cross sections, comprising

a housing having a valve seat and wedge members spaced about said seat,
a valve disk having a shaft operatively connected to said housing which pivotally connects said disk to said housing between the open and closed positions about an axis of rotation parallel to the plane of said disk,
said disk includes a pressure wheel on the side of said disk facing away from said seat,
said pressure wheel being adapted to rotate about on axis of rotation which is perpendicular to the plane of said disk, and including radially projecting spokes which engage said wedge members after said disk is moved to its closed position against said seat and said wheel is rotated in one direction to produce a pressing force for a tight valve seal, and which disengage from said members when said wheel is rotated in the opposite direction before said disk is moved to its open position away from said seat, and
a device which, by translational motion, rotates said disk between its open and closed positions in one plane and rotates said pressure wheel between its engagement and disengagement positions in a perpendicular plane, wherein said drive includes
an arc shaped guideway connected to said housing,
a rod movably positioned within said guideway,
a ram connected to said rod which itself moves in a translational direction and which moves said rod within said guideway,
a first pin connected to said rod and the outer end of one of said projecting spokes of said wheel for engaging and disengaging said spokes with said wedge members without rotation of said disk when said ram moves said rod in a portion of said guideway,
a link connected at one end to said rod,
a second pin connected at the other end of said link, and
an arm connected to said second pin and said disk, wherein through, said link, second pin and arm, said ram moves said rod in another portion of said guideway to open and close said disk without rotation of said wheel.

9 more elements

Dependencies are inferred from the claim text.

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Abstract

A gate adapted particularly for sealing off large cross sections, comprising

a housing having a valve seat and wedge members spaced about said seat,
a valve disk having a shaft operatively connected to said housing which pivotally connects said disk to said housing between the open and closed positions about an axis of rotation parallel to the plane of said disk,
said disk includes a pressure wheel on the side of said disk facing away from said seat,
said pressure wheel being adapted to rotate about on axis of rotation which is perpendicular to the plane of said disk, and including radially projecting spokes which engage said wedge members after said disk is moved to its closed position against said seat and said wheel is rotated in one direction to produce a pressing force for a tight valve seal, and which disengage from said members when said wheel is rotated in the opposite direction before said disk is moved to its open position away from said seat, and
a device which, by translational motion, rotates said disk between its open and closed positions in one plane and rotates said pressure wheel between its engagement and disengagement positions in a perpendicular plane, wherein said drive includes
an arc shaped guideway connected to said housing,
a rod movably positioned within said guideway,
a ram connected to said rod which itself moves in a translational direction and which moves said rod within said guideway,
a first pin connected to said rod and the outer end of one of said projecting spokes of said wheel for engaging and disengaging said spokes with said wedge members without rotation of said disk when said ram moves said rod in a portion of said guideway,
a link connected at one end to said rod,
a second pin connected at the other end of said link, and
an arm connected to said second pin and said disk, wherein through, said link, second pin and arm, said ram moves said rod in another portion of said guideway to open and close said disk without rotation of said wheel.

9 more elements