Step 4 · Turn the Adjustment Screw
With the lock nut loosened, you can now adjust the pressure. Since our assumed goal is to increase low pressure, you will use a flathead screwdriver or the appropriate tool for your valve's screw. Turn the adjustment screw clockwise (righty-tighty) to increase the downstream water pressure. Start with a small adjustment, such as a one-half turn. If your goal was to decrease pressure, you would turn the screw counter-clockwise (lefty-loosey).