What is the composition of the valve group?
2 Answers
The valve group is generally composed of components such as the valve, valve seat, valve guide, valve spring, valve spring seat, and valve lock (lock pin). The following is a related introduction about valves: 1. Function: The valve is specifically responsible for introducing air into the engine and expelling the exhaust gases after combustion. In terms of engine structure, it is divided into intake valves and exhaust valves. The intake valve's function is to draw air into the engine to mix with fuel for combustion; the exhaust valve's function is to expel the burned exhaust gases and dissipate heat. 2. Working conditions: Valves operate under extremely harsh conditions. First, valves are in direct contact with high-temperature gases, suffering severe heating with difficulty in heat dissipation, resulting in very high valve temperatures. Second, valves are subjected to gas forces and valve spring forces, as well as impacts when the valve seats due to the inertia of the valve train's moving parts. Third, valves open and close at extremely high speeds and move at high speeds within the valve guide under poor lubrication conditions.
I've been driving old cars for decades and have dealt with the valve train quite often. It consists of several major components: the valve itself, valve spring, valve guide, and valve retainer. The valve is responsible for opening and closing the passage for air and fuel mixture in the cylinder, acting like an engine's gatekeeper. The spring provides the force to return the valve to its original position, ensuring quick closure. The guide is a tube installed in the cylinder head that keeps the valve moving straight up and down. The retainer is a small clip that secures the top of the spring to prevent it from coming loose. If the spring weakens or the guide wears out, the car may emit black smoke, lose power, or even develop a tapping noise. I remember one time when my car had poor acceleration - replacing the springs fixed the issue. So it's important to regularly inspect and clean carbon deposits; don't underestimate these components. Proper maintenance of the valve train improves engine efficiency and makes driving more fuel-efficient.
