What is the function of an automotive pressure relief valve?
2 Answers
The function of an automotive pressure relief valve is to automatically open and close based on the system's working pressure, effectively protecting system safety. It is typically installed on equipment or pipelines in closed systems. When the pressure reaches the upper limit, the pressure relief valve automatically opens to reduce pressure and ensure safety. Working principle of automotive pressure relief valve: When the pressure in the pipeline exceeds the set pressure of the relief valve, oil will flow out from the relief valve, thereby controlling the pipeline pressure not to exceed a certain limit. The needle-type pressure relief valve adjusts the tightening force by changing the length of the spring force in the valve. When the pressure in the pipeline is higher than the set value, the spring is reversely compressed, the sealing needle opens, and the oil leaks out, playing a role in protecting equipment and regulating system pressure.
I've been driving turbocharged cars for decades, and every time I release the throttle after stepping on it, I hear that whooshing sound—that's the blow-off valve at work. Simply put, its job is to prevent the engine from being damaged by pressure. The turbocharger compresses air like crazy during acceleration, and once you let off the throttle, the intake pipe shuts tight. If the air has nowhere to go, it can rebound and damage the turbo blades or the engine itself. The blow-off valve opens just in time to release the excess pressure, keeping the car safe. I remember one time when my car lost that sound, and the engine started surging badly—it almost needed a major repair. A quick check at the shop revealed the blow-off valve was stuck. A small expense to replace it, and everything was back to normal. This little thing is truly an unsung hero, working tirelessly without complaint during long trips or city traffic jams. Those who understand how it works can avoid pitfalls—don't wait until it fails to start worrying.
