What is the typical cone angle of an exhaust valve?

[VonJohn]

The cone angle of an exhaust valve is generally 45 degrees. Below is relevant information about exhaust valves: 1. Reason: The conical surface of the valve forms a sealing band when matched with the valve seat. A 45-degree valve cone angle is primarily chosen based on considerations such as sealing performance, machining convenience, and strength requirements. Other angles cannot achieve the sealing effectiveness of the current design angle. 2. Valve working principle: Part of the heat received by the valve head is transferred to the cylinder head through the valve seat ring; another portion is also transferred to the cylinder head via the valve stem and valve guide, ultimately being carried away by the coolant in the cylinder head water jacket. To enhance heat transfer, the sealing conical surfaces of the valve and valve seat ring must be tightly fitted. Therefore, they must be lapped in pairs and cannot be interchanged after lapping. The valve stem has high machining precision and low roughness, maintaining a small clearance with the valve guide to minimize wear and provide good guidance and heat dissipation.