Pipeline sieve with a suction removal device

Device for mechanically purifying liquids in a pipeline, comprising a rotation-symmetrical spherical sieve chamber having a wall forming a section of the pipeline and having inlet means with a central axis and outlet means for liquid to be purified, a rotation-symmetrical sieve body having an inner surface, a central axis and a circular periphery and being disposed in said sieve chamber, said central axis of said sieve body being disposed at an angle of substantially 30.degree. to 60.degree. relative to said central axis of said inlet means, a suction removal device disposed in said sieve chamber at an angle of substantially 30.degree. to 60.degree. relative to said central axis of said inlet means for removing deposits from part of said inner surface of said sieve body, said suction removal device being coaxial with said sieve body, said sieve body and said suction removal device being rotatable relative to each other for successively sweeping all of said inner surface of said sieve body with said suction removal device, and a suction discharge line passing through said wall of said sieve chamber, running along said central axis of said sieve body and being connected to said suction removal device for rotating said suction removal device, for discharging debris and for holding said suction removal device in place.