Objective

Design and fabricate a bi-directional flow control valve that will close automatically, by sensing a pressure drop, if either side of the piping is broken.  The valve will sense a pressure drop when threshold water flow is exceeded in either direction.  The valve will not leak, but will incorporate a small leakage flow when closed in order for the valve to restart once the piping is repaired.  This leakage flow will be contained within the valve.  Common tools will be able to be used to install valve onto standard National Pipe Thread (NPT) piping.  A bi-directional valve system would be able to isolate a broken pipe.  This will stop the problem of water continuing to flow after a break, and more importantly, allow the system to still operate after a pipe is broken.  The valve should accept a 1.5 inch NPT pipe and allow initial threshold flow values of 60, 70, 80, 90, and 100 gallons per minute.