Screen for gases

A screen for gases intended to prevent passage of particles bigger than different defined dimensions at the same time as the pressure drop existing over the screen is as low as possible, said screen (1) is built up of to a cylindrical package connected rings (2), which are individually separated by spacers (3) for creating slits (5) between the rings (2), which have dimensions adapted to the actual particles, characterized in that the rings (2) consist of sheet-formed washers (6) having a centrally located hollow formation (7) limited by a continuous strip (8) extending into the plane of extension of the washers (6), said strip has a predetermined width and a thickness which continuously decreases in direction towards the hollow formation (7), the width of the slits being increased in the flow direction of the actual medium in order to receive a pressure recover in the gas flow and that the spacers (3) consist of shoulders (4) on the rings (2) in creating said slits (5), said shoulders (4) are provided in a predetermined pattern and number between the rings (2) and around the circumference of the rings (2) at the same time as the rings (2) are kept together into a package by aid of the shoulders (4).