We have public water and I changed out a valve, but when we turned water back on it was not the same pressure as before. Any help would be greatly appreciated

Hi Trudy

How is the water pressure at the outside faucet? If pressure/volume is good there then my bet is that the screens/filters in the aerators at all faucets are clogged... simply remove and clean to restore pressure/volume of water to the house.

If the pressure/volume of water coming from the outside faucet is poor then the valve you opened may have broken and is not fully opening (or has not been fully opened?) or perhaps a pressure reducing valve got clogged.

Check the outside faucet and let me know what you discover, OK?

Mark