| 摘要 |
A gully (1) comprises a gully side connector (3) at an outlet opening (10), and a flow brake (13) is mounted in said gully (1). The flow brake (13) has an inlet opening (17) and comprises a brake side connector (21) connected detachable to the gully side connector (3; 3') to provide a flow path through the flow brake (13) and the outlet opening (10). The flow brake inlet opening (17) has a size with a minor transverse dimen sion (ai; si). A housing (29) is provided covering the inlet opening (17) and at least a part of the outer flow brake wall adjacent the inlet opening (17), said housing comprising a perforated wall with a plurality of apertures spaced from the outer flow brake wall, each aperture having a minor transverse dimension (aa; aa2) not exceeding 60% of the minor transverse dimension (ai; si) of the inlet opening (17; 17'). |
