The Graco 804397 Thermal Relief Valve helps protect pressure washer pumps from overheating by automatically releasing hot water when internal temperatures rise.
The Graco 804397 Thermal Relief Valve is used in several Graco Hydra-Clean pressure washers and related high-pressure cleaning systems to protect the pump from overheating.
The Graco 804397 Thermal Relief Valve is a safety component designed for pressure washer pump systems. Its purpose is to protect the pump from overheating when water remains circulating inside the pump while the spray gun is not being triggered.
When water temperature inside the pump rises beyond a safe level, the valve automatically opens and releases hot water. This allows cooler water to enter the pump, preventing seal damage, pump wear, and system overheating. Installing a properly functioning thermal relief valve helps maintain the performance and longevity of your pressure washer equipment.
| Specification | Details |
|---|---|
| Part Number | 804397 |
| Product Type | Thermal Relief Valve |
| Brand | Graco |
| Function | Releases hot water to protect pump from overheating |
| Application | Pressure washer pump systems |
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