Selection of diameter for electric control valve
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Dear experts, I have a heating device that uses saturated steam; the inlet pressure is 0.4 MPa gauge, while the pressure inside the device is normally 0.1 MPa gauge. The maximum flow rate is 3 T/h. What size valve should be selected? I calculated that a flow coefficient of 43 would be sufficient. According to the selection chart, a very small valve would be needed, but I’m not quite sure about this. Please help me calculate it. Thank you!
Please provide the detailed process parameters: medium, temperature, pressure before the valve, pressure after the valve, flow rate (at least one of maximum, normal, minimum)
The saturated steam coming out of the temperature and pressure reducer has a temperature of 143 degrees and a pressure of 0.4 MPa; it then flows into the tubular heat exchanger. The pressure in the heat exchanger should be no higher than 0.2 MPa. It’s not clear how to calculate the pressure after the valve, with a maximum flow rate of 3000 kg/h.
Based on a pressure of 0.4 MPa before the valve and 0.2 MPa after it, I calculated the flow coefficient KV to be 46; therefore, a single-seat control valve or a sleeve control valve with a DN100 size was selected