VALVE STRUCTURE FOR CONTROLLING FLOW OF LIQUID INTO A PNEUMATIC LIQUID DISPOSAL SYSTEM

摘要

Liquid is discharged into a conduit of a pneumatic liquid disposal system from an inlet conduit. Valve structure is interposed between the inlet conduit and liquid disposal system which opens when a sufficient quantity of liquid is present in the inlet conduit and closes when the flow of liquid thereto stops. The valve structure has a flexible diaphragm which functions as a pressure sensing means and initially flexes responsive to the presence of liquid in the inlet conduit and acting on one side of the diaphragm. Such initial flexing movement of the diaphragm causes the pressure at the opposite side of the diaphragm to be reduced below atmospheric pressure and establish a pressure differential across the diaphragm to effect further movement thereof and open a main valve to enable liquid from the inlet conduit to be discharged into the pneumatic liquid disposal system.