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How do I replace a Thermal Relief Valve in a Gas Pressure Washer?

The thermal relief valve releases hot, high-pressure water from the pump system onto the ground in order to prevent damage to the pump. The hot water builds up when the spray gun is not being used. The pressure and temperature are controlled by the unloader valve. The thermal relief valve opens if the water gets too hot and dumps hot water on the ground. After the pressure is released, the thermal relief valve closes. The pump will not develop pressure if the thermal relief valve fails to open and the unloader valve fails to shut. The pump cannot build up pressure if the thermal relief valve fails to shut properly. The thermal relieve valve should be replaced if it fails to open and close properly.

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