Negative pressure - dewatering installation for structures

摘要

An improved vacuum-type waste water removal system is provided for use in buildings wherein waste water, collected from facilities such as toilets and bath tubs in the building, is fed by gravity feed lines to a collection chamber connected to a vacuum line for removal of the collected water, and wherein a check valve is connected between the collection chamber and the vacuum line which opens automatically when the water reaches a preselected maximum. The improvement concerns the provision of a backwash receptacle connected to either a gravity line or the collection chamber at a location above the maximum water level in the collection chamber and substantially below the facilities referred to. The volume of the backwash receptacle is large as compared with the collection chamber and the backwash receptacle serves to reduce operating noise and to provide overflow protection.