I recently intalled a Price Pfister 26 series kitchen faucet. The faucet seems to work correctly, except that the flow out the faucet is low. Also, the flow from the spray nozzle is greater than from the faucet. I have checked the system pressure to be 40 to 50 psi, so I know that is not the problem. I have looked at the diverter below the control valve and it appears to be clean. I also changed the diverter valve and had the same results.

Thanks for any help.

" I have looked at the diverter below the control valve and it appears to be clean. I also changed the diverter valve and had the same results."
Are you saying that you tore into the valve, removed the spout and changed the diverter? If not then please explain what the "diverter valve" is. Regards, Tom

The flow rate from my Price pfister is 1/2 g/m at a static pressure of 42 psi. changed the valve cartridge and diverter but no appreciable help. Can the cartridge be modofoed to fix?

Did you remove the aerator and check for debris in thje screen? Was there a strong flow with the aerator off?
Let me know, Tom

I removed the aerator and checked for debris. There was no debris. There is no improvement in the flow with the aerator removed.