Deflection compensated roll for paper/board or finishing machine

A deflection compensated roll for a paper/board or finishing machine, comprising:

• a stationary roll shaft (1);
• a roll shell (2) structured and arranged to be rotatable about said stationary roll shaft (1);
• said stationary roll and said roll shell forming a roll, and wherein said roll in cooperation with a counter roll forms a nip therebetween;
• a plurality of slide bearing elements (3-6) structured and arranged on said stationary roll shaft (1), said plurality of slide bearing elements (3-6) being structured and arranged to support said roll shell (2) around said stationary roll shaft (1);
• and
• a hydraulic fluid feeding means coupled to each of said plurality of slide bearing elements for loading each of said slide bearing elements with a hydraulic fluid, wherein each of said hydraulic fluid feeding means is provided with control elements, whereby loading-direction slide bearing elements (3, 4) acting in a plane of a nip load (F) are loadable in such a way that said roll shell (2) is able to perform a stroke radially relative to the roll shaft (1) or is able to remain substantially immobilized relative to the roll shaft (1);
• wherein the control elements comprise:
• a control valve (7) operatively coupled between said loading-direction slide bearing elements (3, 4) and a hydraulic fluid supply pressure via a pressure line (8),
• wherein said pressure line (8) comprises
• elements (14) for isolating said pressure line (8) from a feed pressure, and
• valve means for feeding a hydraulic fluid separately along feed lines (10, 11) to each of said loading-direction slide bearing elements while said pressure line (8) is isolated from said feed pressure, whereby said control valve (7) closes hydraulic lines coupled to said loading-direction slide bearing elements thus allowing a stroke of said shell (2) in said loading direction
• wherein when said nip load (F) is applied to said roll shell (2), said control valve (7) automatically offsets from said nip load (F) a loading force applied to a loading-direction slide bearing element (3) acting in a direction opposite to said nip load (F), said offset from said nip load (F) being immediately instigated by a shift of said loading-direction slide bearing element acting in a direction opposite to said nip load (F), such that the roll shell bearing assembly is essentially a non-stroke assembly.