VACUUM DRAIN SYSTEM

摘要

A sanitary drain system for a building in which a plurality of waste water drains are connected to a soil pipe and with the outlet end of the soil pipe being provided by a hydraulic closure. A vacuum is provided in the soil pipe and an inlet valve is provided in the connection between each waste pipe and the soil pipe. The inlet valve is of the type which is responsive to the vacuum in the soil pipe to remain closed in the absence of waste water in the drain at the inlet side of the valve. However, the inlet valve opens when there is water in the drain at the valve's inlet side so that waste water and also solid wastes can readily pass through the valve and thence through the soil pipe to the sewer.