What materials are typically used to manufacture valves?

Valves in small engines are typically manufactured from heat-resistant materials to withstand the high temperatures and pressures that occur during engine operation. These materials are often metals that can endure continuous thermal stress without deforming, such as steel or alloys specifically designed for high heat scenarios.

Using materials that can resist thermal damage is crucial for maintaining the integrity and functionality of the valve system. If valves were made from materials that cannot withstand high temperatures, they would degrade quickly, leading to engine failure or decreased performance.

While aluminum and iron might be used in some engine components for their weight and strength, those choices alone do not appropriately describe the most critical quality required for valves. Similarly, plastic and rubber do not provide the necessary durability against heat and pressure involved in engine processes, making them unsuitable for valve manufacturing. In contrast, combining iron and copper does not generally apply because while they have their uses in engines, they do not form the basis for valves that are specifically engineered to handle extreme conditions.