Mi-t-m 22-0370 Pressure Washer Thermal Relief Valve 3/8G 145°F

The Mi-T-M 22-0370 Pressure Washer Thermal Relief Valve 3/8G 145°F is a Pump & Pressure System valve designed to help protect compatible pressure washer pumps from excessive heat buildup caused by recirculating water during extended bypass operation.

This part fixes the following symptoms:

• Pump becomes unusually hot during operation.

• Thermal relief valve leaks or discharges water.

• Water remains overheated inside the pump.

• Valve shows visible damage or corrosion.

• Pump protection becomes unreliable during extended operation.

Pump Overheating

Quick Check: Check whether the pressure washer has been operating without sufficient water flow or with the trigger closed for an extended period.

Fix Suggestion: Restore proper water circulation and inspect the thermal relief valve for correct operation and visible damage.

Prevention Tip: Avoid leaving the pressure washer running with the spray gun trigger closed for prolonged periods.

Thermal Relief Valve Discharges Water

Quick Check: Observe whether water is released from the valve when pump temperature rises.

Fix Suggestion: Allow the pump to cool and investigate restricted water circulation or abnormal heat conditions before condemning the valve.

Prevention Tip: Maintain adequate water flow during pressure washer operation.

Valve Leakage

Quick Check: Inspect the 3/8G valve connection and valve body for persistent leakage when the pump is cool.

Fix Suggestion: Check the connection and sealing area for damage or improper installation, replace the valve if it is physically damaged or fails to seal correctly.

Prevention Tip: Inspect the valve and connection periodically for leakage or deterioration.

Damaged Thermal Relief Valve

Quick Check: Examine the valve body for cracking, corrosion, or other visible deterioration.

Fix Suggestion: Replace the valve when physical damage or confirmed valve failure prevents reliable thermal protection.

Prevention Tip: Keep the pump assembly clean and address leaks or overheating promptly.

Customer Experience: Customers replacing a worn thermal relief valve often notice more dependable pump protection when proper water circulation and operating practices are maintained.