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Direct Acting Downstream Pressure Regulating Valves – also, called as Pressure Reducing Valves – are meant for reducing the source pressure and regulating the outlet / downstream pressure at the pre-determined set value required for the processes. With direct acting Regulators precise pressure control can be achieved at specified process requirements.
As outlet / downstream pressure tend to drop due to consumption at process, the spring force pushes the diaphragm down, due to which stem & soft seating disc also moves down and opens the port. As soon as outlet / downstream pressure is compensated, the diaphragm pushes up, the stem & soft seating disc also moves up and the port opening closes.