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The Shone System

PNEUMATIC SEWAGE EJECTORS

The Shone Ejector consists of a closed sewage receiver or pot with special horizontal swing check valves below inlet and outlet (1!) and an automatic pressure operated air valve mounted on top of the receiver and actuated by cast-iron bells connected to the valve by a system of links, lever and rocking valve shaft. The automatic air valve controls the admission of air to and the exhaust from the receiver. The operation of the Ejector is as follows :

The bells are in their lowest position (the extent of their movement Deing limited to 11/2 inches) the compressed air is cut off from the Ejector, and the interior of the Ejector is open to the atmosphere through the automatic valve and air exhaust pipe. The sewage, therefore, can flow through the intet into the Ejector, which it gradually fills, until it reaches and begins, to rise around the bell. When the latter is sufficiently submerged for its buoyancy to overcome the friction of the parts, both bells are raised into their upper position. The consequent movement of the lever throws over the automatic valve, closing the connection between the inside of the Ejector and the atmosphere, and admitting compressed air. This causes the check in the inlet to close, preventing a return in that direction; and the compressed air, pressing upon the surface of the sewage, immediately forces the contents of the Ejector downward through the bell-mouthed opening at the bottom, and out through the discharge check valve and the discharge pipe to the high level sewer.

The sewage passes out of the Ejector until its level falls to such a point that the lower bell is sufficiently exposed for its weight to throw the system out of equilibrium in the opposite direction. The bells consequently fall, reversing the automatic valve and returning' it to its original position. This cuts off the compressed air, whereupon the outflow of sewage ceases and the check in the discharge valve closes, allowing the air within the Ejector to escape to the atmosphere. The sewage which has been ejected cannot return past the discharge valve; sewage again begins to flow into the Ejector, and this cycle of operation is repeated so long as sewage flows to the inlet and a supply of air is maintained.