Abstract: A method and apparatus for controlling the flow of process fluids comprising a primary loop for process fluids; a plurality of secondary loops for the process fluids; a plurality of bridges, each coupling the primary loop with a secondary loop, each bridge having feed and return connections coupled to feed and return lines of the primary loop and feed and return connections coupled to feed and return lines of the secondary loop, and a crossover line coupling the primary and secondary loops; valve means for each bridge for controlling the flow of processing fluid through its associated second loop; microprocessor means for each bridge for adjusting its associated valve means; sensor means for each bridge for determining operating characteristic information of the processing fluid and for feeding such determined information to the microprocessor means; and a host computer coupling each of the microprocessor means in systems configuration.

Abstract: A system for cooling a flow of air at a plurality of sites comprising a process water chiller subassembly, a plurality of air cooling subassemblies, a primary loop for process water extending between the process water subassembly and the plurality of air cooling subassemblies, means to effect a flow of air to be cooled across the secondary loops at the sites to be cooled, a plurality of water bridges, each coupling the primary loop with a secondary loop, each water bridge having feed and return connections coupled to the feed and return lines of the primary loop and feed and return connections coupling feed and return lines of a secondary loop, and a crossover line coupling the primary and secondary loops, a pressure responsive valve in the path of flow through the primary loop and a flow sensor for each waterbridge to determine the flow in its crossover line for controlling the pressure responsive valve, a temperature responsive valve in the crossover line for each waterbridge and a temperature responsive se