Pressure Washer Thermal Relief Valve Stuck

If the valve sticks in the closed position the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can t open to allow recirculation.

Pressure washer thermal relief valve stuck. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. If the unloader valve sticks shut outlet water pressure builds up until you trigger the spray wand or the pressure relief valve trips to release excess pressure. A defective pressure regulator can cause high pressure at the nozzle. Thermal relief valves are a must have for pressure washers when the water is supplied by a garden type water hose.

If your pressure washer is not building pressure and the engine is surging there could be a few different causes. If the valve sticks in the closed position the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can t open to allow recirculation. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. This just means that a thermal relief valve has been installed on your pump to prevent over heating.

The water is trapped in a loop which means fresh cool water cannot come in. Dirt caught in the spring or a stuck shaft are the most common issues solved by simply removing the unloader and cleaning looking for issues. One of them is a sticking unloader valve. The thermal relief valve is usually preset to discharge water when it reaches 195 degrees.

The new pressure washing technology gave jack s crew a clear advantage and they quickly became known for delivering higher quality work in a lot less time than their competition. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open.