Part Number: 9.802-181.0
OEM / Old Part Number(s): 2-300816, 458037, 725909, 921421, 87072540, 98021810
Thermal Relief Valves are an inexpensive way to protect your high pressure pump from damage caused by high temperature water within the pump head. When the power washer is on, and the trigger gun is released, this puts the unit into a bypass mode, recirculating water in a low pressure loop within the pump head. The friction caused by this recirculating loop increases the water temperature inside the pump head, which in turn can cause damage to pump seals and valves.
Our 9.802-181.0 Thermal Relief Valve opens at 145 degrees F, allowing some of the hot water to be removed, and allowing cool inlet water into the pump head, protecting the seals and valves from damage.