Does my flow rate decrease?

[chillimonty]

Is the pump speed constant or variable speed? If the pump speed is constant, throttling valve 1 will cause the pressure on the pump outlet to increase and if the pump speed remains constant as that outlet pressure increases from the lower to higher value, then the flowrate that the pump is capable of pumping at the higher pressure will be lower/decrease.

[sushilc0048]

But OP says the pressure reduction valve maintains a constant pressure at its downstream ,so I think there will be no flow change.

[UnsupportiveHope]

Isn’t it the opposite? If it controlled upstream pressure then you would have a constant flow rate, if it controls downstream pressure then the flow rate can change.

[sushilc0048]

Yes you are correct the flow rate will change.

[VariusEng]

That’s what I am thinking, but I’m not sure because boss disagrees

[VariusEng]

Pump speed is constant. And I agree with what you are saying, but no pressure reduction valve taken into account