Abstract: A sealed assembly of two cooperating movable or stationary parts with a gap separating different-pressure media, which comprises at least one recess formed in one of said parts to accommodate a liquid seal, said recess communicating with said gap, and a polycapillary lock formed as a compressed fine-grained packing accommodated in at least one of said recesses in communicating relationship with said seal, the packing and the parts being constructed from a material resistant to wetting by the seal.The sealed assembly of the invention is a simple and reliable means of sealing heavy-duty equipment with high-parameter media employed in power engineering, metallurgy, chemical industry and other branches.Provision is made for sealing assemblies arbitrarily positioned in space and for high-speed shafts.