i have enjoyed reading this discussion so far but would like to ask what should the procedure be when, in these times of energy saving, consulting engineers are requesting that operating condensing pressures be reduced from 14.5 bar to 11 bar. if the performance of the valve is in part based on the pressure drop across it, then surely a 3 to 3.5 bar decrease in pressure drop would naturally change the valve/orifice combination's capacity. this surely would therefore force a change of orifice or superheat setting. we do not however receive instruction on this with the comment "the change is not large enough to warrant replacement or adjustment". i have not yet made the time to measure any change, but the 25% change in pressure drop woluld surely have a significant effect on the system operation. does anybody have experience of this?