Patent ID: 7022056

Claim:
A roll in a paper or board machine, said roll comprising: a tubular roll shell ( 2 ) being supportable on a stationary roll shaft ( 3 ) by means of hydrostatic slide bearing elements ( 4 a , 4 b ; 4 a ′, 4 b ′; 5 a , 5 b ; 5 a ′, 5 b ′) acting on the roll shell ( 2 ) in radially opposite directions at least in the direction of a first plane or a plane co-directional with a primary loading (F) and a plane substantially lateral to the plane co-directional with the primary loading (F), said slide bearing elements ( 4 a , 4 b , 4 a ′, 4 b ′, 5 a , 5 b , 5 a ′, 5 b ′) being loadable hydraulically by means of a pressure fluid, further comprising: a regulator ( 20 ) for adjusting a hydrostatic pressure of lateral bearing elements ( 4 a , 4 b ; 4 a ′, 4 b ′) acting in radially opposite directions on the roll shell ( 2 ) in a direction substantially lateral to a plane co-directional with the primary loading (F), said regulator ( 20 ) having feedback connection from main bearing elements ( 5 a , 5 b , 5 a ′, 5 b ′) acting in the direction of a plane co-directional with the primary loading (F) to comply with a predetermined ratio with maximum hydrostatic pressure of the main bearing elements ( 5 a , 5 b , 5 a ′, 5 b ′) substantially acting on the roll shell ( 2 ); said regulator ( 20 ) comprising a mechanical hydraulic valve which further comprises: a cylindrical space ( 21 ) diametrically smaller at one end than at the other end; a valve stem ( 22 ) adapted to be axially movable lengthwise in the cylindrical space ( 21 ); two slides ( 23 , 24 ) fitted in the cylindrical space ( 21 ) in connection with the valve stem ( 22 ), a first ( 23 ) of said slides being mounted on a first end of the valve stem ( 22 ) in a diametrically smaller cylindrical space ( 21 a ), and a second ( 24 ) of said slides, which is provided with a spring ( 26 ), being mounted, in connection with the valve stem ( 22 ), in a diametrically larger cylindrical space ( 21 b , 21 c ), whereby a pressure fluid is suppliable to at least one lateral bearing element ( 4 a , 4 a ′ 4 b , 4 b ′); and a regulator element ( 25 ), which is fitted in connection with a second end of the valve stem ( 22 ) as well as in connection with a feed line (P) for a hydraulic pressure fluid, and that the first slide ( 23 ) is subjectable to a hydrostatic control pressure consistent with a hydrostatic pressure acting on hydrostatic slide bearing elements ( 5 a , 5 a ′, 5 b , 5 b ′) which work against the spring ( 26 ) and act on a roll shell ( 2 ) in a plane co-directional with a primary loading (F) for operating the valve stem ( 22 ) and the regulator element ( 25 ) in such a way—that the hydraulic pressure fluid has access from the feed line (P) into the larger cylindrical space ( 21 b , 21 c ) of the valve ( 20 ) in view of regulating a supply pressure delivered to at least one lateral bearing element ( 4 a , 4 a ′ 4 b , 4 b ′).