Faucet InstructionsFor the Do-It-Yourselfer 


Is My Water Pressure Too High?


High water pressure will sometimes create a “Water Hammer”. Water hammer occurs when a faucet, toilet or washing machine closes its valve suddenly. Quick closing valves are more common today than ever. Almost all toilets use some form of quick closing, or positive pressure shut off valve. Clothes washing machines and dishwashers have electronic inlet valves the close almost instantaneously.

When the water pressure is above that recommended by the appliance manufacture, and the valve closes, the flowing water stops in an instant. Flowing water carries a lot of weight, picture a firefighter’s water hose, have you ever seen in the movies where they knock people over with the water pressure. Now, imagine stopping the water flow suddenly, where will all the pressure and water go. It will go straight back where it came from. If it cannot go backwards to its source fast enough, the pressure will follow the path of least resistance. That path is every plumbing pipe and fixture in your plumbing system. When the water pressure now traveling at over 100 miles per hour stops, it hits each faucet, toilet and machine with such force, it is just like hitting the appliance with a hammer. There are specifications with each appliance you purchase as to the operational limits, like water pressure. Some states, cities and municipalities have laws governing the water pressure supplied to each home. To control the water pressure you can install a pressure-regulating valve that will comply with all your appliance manufacturer’s installation instructions, and your municipal code enforcement.