How to Adjust the Pressure of a Pressure Relief Valve?

[PresleyRose]

Pressure relief valve adjustment method: 1. Open the angle needle valve during adjustment; 2. Loosen the positioning nut and turn the top adjustment screw counterclockwise; 3. Open the inlet (gate or butterfly) valve at the front end of the pressure relief valve; 4. Observe the pressure gauge and tighten the top adjustment screw clockwise as required; 5. Start the water pump to verify the maximum pressure; 6. Adjust the angle needle valve to stabilize the pressure as much as possible; 7. Turn off the water pump to verify the fully closed pressure (a reasonable high-low pressure difference should be less than 10% of the maximum pressure—the smaller the pressure difference, the better); 8. Tighten the positioning nut; 9. Repeat the above steps to confirm the setting is effective. The main function of the pressure relief valve is to protect the turbocharger. When the exhaust pressure is too high, it uses the pressure difference to open the pressure relief valve (on the turbo body), allowing the exhaust gas to bypass the turbocharger and exit through the relief valve.