Regarding the issue of pressure drop in control valves
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The specification sheet for the control valve states that the pressure before the valve (P1) is 0.4 MPa, the pressure after the valve (P2) is 0.1 MPa, the pressure drop is 0.3 MPa, and the pressure drop when the valve is fully closed is 0.45 MPa. Is this pressure drop of 0.3 MPa the pressure drop when the control valve is fully open?
It is not the pressure difference at full open, but rather the pressure difference before and after the valve at its current opening degree, in order to meet your operating conditions. If it’s the pressure difference at full open, then as soon as you close the valve a little, P2 will drop, and in that case the valve has little room for adjustment and becomes ineffective.
Reply 1# ssln123: The pressure drop corresponding to the traffic when it is not fully open.
That is, the pressure drop corresponding to the rated flow rate.