Gully with double backflow-prevention valve

摘要

A gully with double backflow-prevention valve for drains has a housing (1) with a drainage connection piece (5) and an upper receptacle (7) for a mounting piece (9) carrying a cover grating which is flush with the ground. In between, the housing is divided by an insertion piece (31) which can be removed as a whole and which has a passage opening (21) with a valve seat (35), with which valve seat a float ball (37) cooperates as the first backflow-prevention valve member. In addition, the insertion piece carries a plunger (45) as a manually operated actuating member, which acts on an angle arm (53) of a flap (47) mounted removably in the housing and, as the second backflow-prevention valve member, closing a flow opening of the housing. After removing the insertion piece and the flap, the discharge connection is accessible for cleaning purposes. <IMAGE>