Abstract: An apparatus and method for deaeration of treatment agents applied to webs of paper and board, having an inlet manifold (3), an accept-fraction manifold (4), and a reject-fraction manifold (5). For deaeration the assembly uses a plurality of air separator units (12) connected to the manifolds so as to allow admission of the treatment agent to the air separator units (12) from the inlet manifold (3) and discharge of the accept and reject fractions formed in the air separator units (12) respectively to the accept-fraction and reject-fraction manifolds (4, 5). A cut-off valve (18) is mounted on at least the inlet manifold (3), between two parallel-operating air separator units (12), so as to permit cutting off the flow through the manifold (3) at this location of the cut-off valve, dividing the plural air separator units (12) by the cut-off valve (18) into two groups.

Abstract: An assembly is disclosed for an apparatus used for deaeration of treatment agents applied to webs of paper and board, the assembly comprising at least one inlet manifold (3), at least one accept-fraction manifold (4), and at least one reject-fraction manifold (5) with associated framework structures; also a method is disclosed for operating the assembly. For deaeration the assembly uses a plurality of air separator units (12) connected to the manifolds so as to allow admission of the treatment agent to the air separator units (12) from the inlet manifold (3) and discharge of the accept and reject fractions formed in the air separator units (12) respectively to the accept-fraction and reject-fraction manifolds (4, 5).