Collection Chamber

Sewage arrives via normal gravity pipes at the lower section, or wet sump, of the collection chamber just like a manhole in a conventional gravity system.

As the level of the effluent within the wet sump rises, air is trapped in a pipe called a 'sensor pipe', the pressure of which increases as the effluent level continues to rise.

This increase in air pressure is subsequently transferred via flexible tubing to the top section of the interface valve which is known as the 'controller'.

Eventually this pressure becomes great enough to operate a switch within the controller which then allows vacuum pressure to be transferred to the main body of the valve and cause it to open.

With the valve in the open position, air at atmospheric pressure acting on the surface of the liquid within the wet sump then forces the sewage into the 'suction pipe', past the interface valve and onward into the sewer pipe network.

Once all of the sewage has been removed from the wet sump, the valve remains open for a short period of time to allow air at atmospheric pressure to enter the sewer pipe network.

The valve then closes under the action of a spring to complete one cycle.

Iseki Utility Services, 10125 Channel Road, Lakeside, CA . Tel: 44-01-789-292436; Fax: 44-01789-262518.