Patent ID: 6045336
Filing Date: 2000-04-04
Classification: B01D,F04F,Y10T

Abstract:
In combination a pump and valve for pumping heavier than water leachate from an interface between underlying heavier than water leachate and overlying water comprising:a pneumatically operated pump having a pump casing, a pump inlet to the pump casing for receiving fluid to be pumped, and an internal pumping mechanism for evacuating the pump casing only when fluid floods the pump casing from the pump inlet;a valve including a valve seat located to receive heavier than water leachate and a conduit communicated from a valve seat to the pump inlet of the pneumatically operated pump for flooding the pump casing;a valve disc for opening and closing the valve seat to admit the heavier than water leachate to flow to the pneumatically operated pump;a float placed at the interface between the underlying heavier than water leachate and the overlying water having a specific density between that of the water and the heavier than water leachate for actuating the valve disc;means operatively connecting to the float to the valve disc to cause the valve disc to close the valve seat when water is present about the float to prevent pumping and to cause the valve disc to open when the heavier than water leachate is present about the float.