[retiredguy123]

Which valve? Is this at a toilet or a sink? I would buy a pressure gauge and test your water pressure at an outside hose bibb to see if your pressure is too high. It should be about 60 PSI. Also, check the drain pan under the water heater for evidence that the pressure relief valve has been tripping and spewing water into the drain pan. You can also place a plastic cup under the relief valve discharge pipe to see if the relief valve is occasionally tripping. Tap the expansion tank at the top of the water heater with a metal tool to determine if it may be full of water. It should have air in it and have a hollow sound. Also, the water temperature may be set too high. If these things check out, then you probably need to replace the shutoff valve.