Patent ID: 7753341

Claim:
A valve for closing a seawater pipe; the valve comprising: a supporting body fixed to said pipe; a shutter movable, with respect to said supporting body, between a forward closed position closing the pipe, and a withdrawn open position opening the pipe, wherein the shutter comprises a stem and head; a control member rotated from outside said pipe to move said shutter; transmission means for transmitting motion from said control member to said shutter; and sealing means for isolating said transmission means in fluidtight manner from the seawater flowing, in use, in said pipe; wherein said transmission means comprises a shaft hinged to said supporting body about an axis and rotated by said control member and an axial guide means for guiding said shutter along said axis; wherein said supporting body comprises a tubular appendix projecting inside said pipe; wherein said axial guide means is positioned radially between said stem of said shutter and said tubular appendix; wherein said axial guide means is configured to render said shutter angularly fixed; wherein said head comprises a tubular projection positioned radially within a hollow cavity of said stem; and wherein said head and said stem each comprise a hollow cavity capable of receiving at least a portion of the shaft.