Automatic Control Valve, Dual Setting Pressure Reducing Valve. Proportional Pressure Reducing Valve Work by Flow Rate (Model 132-090) controls pressure proportionally according as rate of flow. When rate of flow increase in pipeline, the valve operate higher pressure. When rate of flow decrease , the valve operate lower pressure. Therefore, Model 132-090 controls outlet-pressure proportionally according as rate of flow, even if the rate of flow change arbitrarily or slightly. Model 132-090 is optimized in waterworks, in state of smooth pressure change in pipeline. Also 132-090 have the function to prevent hunting itself.