Pressure Washer Thermal Relief Valve Stuck

If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open.

Pressure washer thermal relief valve stuck.

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. 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. The water is trapped in a loop which means fresh cool water cannot come in. Until you pull the trigger your pressure washer is in by pass mode.

A defective pressure regulator can cause high pressure at the nozzle. This just means that a thermal relief valve has been installed on your pump to prevent over heating. As the co owner of an industrial cleaning and painting company jack simpson created the first simpson pressure washer in 1961. Wait 5 minutes before using.

Thermal relief valves are a must have for pressure washers when the water is supplied by a garden type water hose. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. 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. 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 your pressure washer is not building pressure and the engine is surging there could be a few different causes. The thermal relief valve is usually preset to discharge water when it reaches 195 degrees.