Patent ID: 8622075

Claim:
A fluid flow control valve comprising a cylindrical inlet chamber having a fluid inlet aperture and a coaxial waisted cylindrical outlet chamber having a fluid outlet aperture, said inlet chamber containing a coaxial cylindrical cage opening into said outlet chamber and said cage having in its cylinder wall at least one valve aperture to allow fluid to pass from said fluid inlet aperture into said outlet chamber, said control valve further comprising a coaxial cylindrical plug movable axially relative to said cage to close and open said valve aperture and a valve actuator operable to move said plug or cage relative to each other whereby to close or open said valve aperture, wherein said valve aperture is arranged to provide fluid exiting said cage from said inlet chamber with a velocity component tangential to the cylindrical axis of said cage, wherein a vortex breaker is positioned in said outlet chamber downstream of the waisted portion thereof.