Fluid flow control system for two feed pipes - has throat section in each pipe with interconnected press. tappings membranes and valves

摘要

The system is for the automatic flow control of fluid movements along two pipes of different diameters. Each pipe (1, 2) has a metering venturi with a short parallel sided throat section (3, 4) and pressure tapping tubes before (17, 19) and after (18, 20) each venturi. The pressure tapping tubes are connected with coaxial cylinders with a central partitioning membrance (13, 14) for each cylinder. Each membrance is attached to a piston rod clamp, the piston rod being common to the two cylinders and having at each end a conical washer (16, 16') with diameter appropriate to a restriction in the pipe, so that the piston rod reciprocates to open and close the valves in each flow-pipe in turn.