Patent ID: 7322560

Claim:
A coaxial valve comprising: a valve box, having at least one fluid inlet opening, at least one fluid outlet opening, and a common flow channel connecting the fluid inlet and fluid outlet openings together, a tubular shaped valve casing, which is prevented from turning but permitted to be axially pivotable, featuring a fluid inlet port and an outlet port which join the common flow channel, a shutoff mechanism, located inside of the valve box, which is coaxial to the valve casing and designed to shut off the fluid inlet port or the outlet port of the valve casing, and a drive to produce axial movement of the valve casing, wherein the valve casing is provided, at least in sections, with at least one threaded external nut at an outer circular groove, wherein the valve casing is enclosed by a coaxial drive casing at a location of the outer circular groove, wherein the drive casing is provided with at least one threaded inner circular groove adapted to the outer circular groove so that ball bearings running along the inner and outer circular grooves create tension against one another, thus forming a ball planetary gear of a ball rotary spindle drive, and wherein the drive casing is located inside of the valve box, is pivotable but firmly seated axially, and is made to pivot by a drive motor inside of the valve box.