When we show up to install a dishwasher, we need to turn off the water in order to remove the old unit and install the new one. The dishwasher waterline is typically connected to a valve under your kitchen sink.
Frequently, we find that this valve is corroded and no longer works. The water cannot be shut off with that valve. We then have to search for your home’s main water shut off valve.
Not all valves are the same
One reason that so many valves are corroded is that it is common to use low-cost gate valves when construcing a home.
We only use high-quality stainless steel quarter-turn ball valves to replace those in your home. These valves last significantly longer and have many fewer internal corrosion issues.
Ball Valves vs Gate Valves
With gate valves, the internal stem that connects the knob to the gate becomes increasingly likely to fail. Ball valves are more effective at forming a tight seal and have more reliability and longevity than gate valves, but tend to be more expensive.
Unfortunately, because ball valves can open and close immediately, they are more likely than gate valves to cause water hammer.
When a valve is quickly closed on water moving at high pressure through pipes, it can cause shock waves through the plumbing that create a hammering sound.
Under high enough pressure, water hammer can cause a pipe to weaken and break. For that reason, users are advised to turn the ball valve lever slowly to avoid water hammer.
We can help
In addition to installing your new appliance, your installer is trained to replace the corroded valve under your sink and will typically ask you if you would like to have that done. Additional charges apply.