Device for imparting a rotary movement about a longitudinal direction for the valve control and comprising along said longitudinal direction: - a first linear hydraulic cylinder comprising a first casing and a first piston able to provide a translation movement along said longitudinal direction in said first casing , said first hydraulic cylinder being able to be supplied by a control fluid; - a second linear hydraulic cylinder comprising a second casing a second piston able to provide a translation movement along said longitudinal direction in said second casing , said second hydraulic cylinder being able to be supplied by a control fluid; - a member for converting linear motion into rotary motion in order to convert a translation movement of the second piston along said longitudinal direction into a rotary movement about said longitudinal direction; said first and second hydraulic cylinders being configured in such a way that the first hydraulic cylinder is able to influence the second hydraulic cylinder ; and wherein: - said first piston comprises a first plate able to determine a first and a second chamber in said first casing ; - said first hydraulic cylinder comprises a first and a second ports (61; 62) in order to respectively supply said first and second chambers with said control fluid and impose a translation movement of said first piston thanks to a difference in pressure between said first and second chambers; - said second piston comprises a second plate able to delimit a third and a fourth chamber in said second casing ; - said second hydraulic cylinder comprises a third and a fourth ports (63; 64) in order to respectively supply said third and fourth chambers with said control fluid and impose a translation movement of said second piston thanks to a difference in pressure between said third and fourth chambers; and: - said member for converting comprises a rotating element separate from the second piston in order to convert a translation movement of the second piston into a rotary movement, said rotating element being located outside of the first and second casings (21; 22). - a first linear hydraulic cylinder comprising a first casing and a first piston able to provide a translation movement along said longitudinal direction in said first casing , said first hydraulic cylinder being able to be supplied by a control fluid; - a second linear hydraulic cylinder comprising a second casing a second piston able to provide a translation movement along said longitudinal direction in said second casing , said second hydraulic cylinder being able to be supplied by a control fluid; - a member for converting linear motion into rotary motion in order to convert a translation movement of the second piston along said longitudinal direction into a rotary movement about said longitudinal direction; - said first piston comprises a first plate able to determine a first and a second chamber in said first casing ; - said first hydraulic cylinder comprises a first and a second ports (61; 62) in order to respectively supply said first and second chambers with said control fluid and impose a translation movement of said first piston thanks to a difference in pressure between said first and second chambers; - said second piston comprises a second plate able to delimit a third and a fourth chamber in said second casing ; - said second hydraulic cylinder comprises a third and a fourth ports (63; 64) in order to respectively supply said third and fourth chambers with said control fluid and impose a translation movement of said second piston thanks to a difference in pressure between said third and fourth chambers; - said member for converting comprises a rotating element separate from the second piston in order to convert a translation movement of the second piston into a rotary movement, said rotating element being located outside of the first and second casings (21; 22). <EOS>