Pneumatic Operated BFP Minimum Recirculation Control Valve

Minimum flow automatic pump recirculation valve system of feedwater pump of boiler in power plant
The most critical application in a Power Station is the Boiler Feed Pump Minimum Recirculation Service. A pump should have a minimum Flow through it to take care of the cooling requirements of the Pump.
Hence even if the Feed Water requirements are very low(due to low load conditions)the pump should handle a minimum flow. To ensure a mount of Flow has to be recirculated back to the Deaerator as the Flow requirements of the Boiler may not be sufficient to satisfy the minimum Recirculation requirements of the pump.
The parameters are obviously very detrimental for any valve to handle. The valve has to drop a pressure of 220-250 bar to 10 bar(Deaerator ppressure). Also it may be noted that the outlet conditions of the valve are near saturation, and hece the valve is very susceptible to high energy Cavitaion and Flashing.
The china choke valve applys to the severe fluid condition of high-preesure-drops between inlet and outlet side on the pipeline.