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What is the composition of the valve group?

2 Answers

Tony

09/07/25 6:12am

The valve group generally consists of components such as the valve, valve seat, valve guide, valve spring, valve spring seat, and valve lock (lock pin). The following is an introduction to the valve: Function: The function of the valve is to specifically input air into the engine and expel the exhaust gases after combustion. Structurally, the engine is divided into intake valves and exhaust valves. The intake valve is responsible for drawing air into the engine to mix with fuel for combustion; the exhaust valve is responsible for expelling the exhaust gases and dissipating heat. Working Conditions: The working conditions of the valve are extremely harsh. First, the valve is in direct contact with high-temperature combustion gases, suffering severe heating and difficulty in heat dissipation, resulting in very high valve temperatures. Second, the valve is subjected to gas forces and valve spring forces, as well as impacts when the valve seats due to the inertia of the valve train components. Third, the valve opens and closes at extremely high speeds and moves at high speeds within the valve guide under poor lubrication conditions.

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RyderRose

09/19/25 5:24am

The valve train plays a crucial role in the engine, primarily consisting of intake and exhaust valves, which act as opening and closing portals for air and exhaust gases to enter and exit the cylinders. The valve spring is responsible for returning the valve to its closed position, ensuring precise control during each combustion cycle. The valve guide supports the up-and-down motion of the valve stem, reducing friction and wear while preventing oil from entering the combustion chamber. The valve seat, located on the cylinder head, ensures a tight seal when the valve is closed, preventing power loss due to leaks. Additionally, the valve rocker arm or pushrod connects to the camshaft, converting the cam's rotation into the opening and closing motion of the valves. These components work together to ensure smooth engine intake and exhaust, impacting overall power and efficiency. I've seen many older car engines lose power due to valve carbon buildup or spring wear, making regular cleaning and maintenance of these parts essential. Especially after high-temperature or high-load driving, checking valve clearance and spring tension can prevent unexpected failures.

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