Pressure Washer Relief Valve Not Working

If the pressure washer runs for more than 5 minutes when the spray wand isn t in use the water in the pump often overheats causing the thermal relief valve to open and discharge hot water onto the ground.

Pressure washer relief valve not working.

From the outlet hose the water passes through the pressure washer gun and out the pressure nozzle. Typically the valve remains closed ensuring that no water is released from the valve unless you re purposefully using it. Until you pull the trigger your pressure washer is in by. About 90 of the time a pressure washer problem will not be caused by the pump.

The two serve the same purpose but function differently. Using the unloader valve is actually quite a simple process. Seeing water spewing out of your pressure washer can be a distressing sight. If your pressure washer has no pressure start by changing your nozzle to a brand new tip.

An unloader valve has a mechanism in place to trap pressure between itself and the nozzle which relieves the pump of withstanding any back pressure created when the trigger wand is. A few factors could be causing this problem. A pressure washer is a small tool that can help you accomplish big jobs. Generally this means that the flow rate required by the pump cannot be supported by the water supply.

After watching this video you may be able to get your pressure wash. The thermal relief valve is usually preset to discharge water when it reaches 195 degrees. In most pressure washer valves the valve is connected with whether or not you are holding down the trigger. Here are five things to check before you assume the worst.

Some power washers may be equipped with a pressure regulator system in place of an unloader valve. If your pressure washer is not building pressure and the engine is surging there could be a few different causes. One of them is a sticking unloader valve. This just means that a thermal relief valve has been installed on your pump to prevent over heating.

The unloader valve is not the correct way to change the pressure output of your machine. How does the unloader valve work. When you pull the trigger on your pressure washer if the water pressure is good for a moment but then weakens you have a surging issue. This video shows the unloader valve in a cut away of a 2700 psi homelite pressure washer.

Most of the time the pump and unloader valve are not causing the problem. When the thermal relief valve opens cool water enters the pump and cools the system.