What is the function of the exhaust valve?

[DeLeilani]

The exhaust valve mainly has the following functions: 1. It allows the exhaust gas to be recirculated into the cylinder for combustion. This small amount of exhaust gas reduces the combustion temperature in the cylinder. Since NOX is generated under high-temperature and oxygen-rich conditions, the generation of NOX is suppressed, thereby reducing the NOX content in the exhaust gas. 2. When the throttle reaches a certain opening degree, the exhaust valve opens, connecting the exhaust gas in the cylinder to the intake pipe, which then enters the cylinder for recirculation and combustion. This ensures complete combustion of the exhaust gas and purifies the air. 3. The exhaust valve improves heat transfer efficiency in the condenser and evaporator by separating oil and gas, which is crucial for systems where the lubricating oil and working fluid have poor mutual solubility.

[McColin]

I've been driving for many years, and the EGR valve plays a crucial role in the engine. It mainly recirculates a portion of the exhaust gases back into the intake system. The benefits of this are lowering the combustion chamber temperature, preventing knocking, and reducing harmful emissions like nitrogen oxides, which is quite helpful for environmental protection. I've personally seen many vehicles experience engine shaking, power loss, and even warning lights due to a clogged or faulty valve. Once problems occur, the car may idle roughly, fuel consumption may skyrocket, and driving becomes unpleasant. I recommend checking it periodically, especially for older models. Cleaning carbon deposits or replacing the valve is neither difficult nor expensive. Regular maintenance ensures a clean EGR system, prolongs engine life, and improves both fuel efficiency and safety.

[DelAlexis]

As a car enthusiast, the function of the PCV (Positive Crankcase Ventilation) valve is pretty cool in engine optimization—it's responsible for recycling and reusing some of the exhaust gases. This design helps cool the combustion process, preventing knocking caused by high temperatures, thereby boosting efficiency while reducing emissions. In modern cars, it assists the engine in meeting environmental standards, making vehicles greener. My tuning experience tells me that if the valve is improperly adjusted or severely clogged with carbon deposits, the car may suffer from rough idling and power fluctuations. I love discussing this topic because it showcases engineering balance: strong performance while staying eco-friendly. When cleaned and maintained properly, the car runs smoother and more fun. Paying more attention to engine details makes the driving experience even silkier.

[Shannon]

When I first started learning about cars, the PCV valve was a small component with significant impact. It redirects exhaust gases back to the intake side to lower temperatures and reduce emissions. Simply put, it helps the engine run smoother and cleaner. If the valve fails, the car may experience shaking, increased fuel consumption, or even trigger warning lights. Fixing it isn't complicated – cleaning or replacement usually solves the issue. Beginners find this particularly useful knowledge. Paying attention to small components' functions while driving proves quite helpful.