Toyota 2L Engine Intake Exhaust Valve Auto Part

The Engine Valve is sealed with a cone between the valve seat or the valve seat ring. The Angle between the valve cone and the top surface of the valve is called the valve cone Angle. The intake and Exhaust Valve cone Angle is generally 45°, and only a few engines have an Intake Valve cone Angle of 30°.

Part of the heat received by the valve head is transmitted to the cylinder head through the valve seat ring; The other part is passed to the cylinder head through the valve rod and valve guide, and is eventually carried away by the coolant in the cylinder head water jacket. In order to enhance heat transfer, the sealing cone of the valve and the valve seat ring must be tightly fitted. 

For this reason, the two should be paired for grinding, and cannot be exchanged after grinding. The valve rod has high machining accuracy and low roughness, and maintains a small matching gap with the valve guide to reduce wear, and plays a good guiding and cooling role. The shape of the tail end of the valve depends on how the upper valve spring seat is fixed. The valve spring seat is fixed by the air lock clamp which is divided into two halves and the outer surface is conical. The structure is simple, the work is reliable, and the disassembly is convenient, so it has been widely used. The inner surface of the air lock clamp has a variety of shapes, and the corresponding end of the valve also has a variety of different shapes of the air lock clamp slot. The valve with hollow valve stem is used in some highly reinforced engines to reduce the mass of the valve and the inertial force of the valve movement. In order to reduce the temperature of the exhaust valve and enhance the heat dissipation capacity of the exhaust valve, sodium cooling valves are used in many automobile engines. The valve is a hollow valve stem filled with half metal sodium. Because the melting point of sodium is 97.8 ° C, the boiling point is 880 ° C, so when the valve is working, sodium becomes a liquid, violently shaking up and down in the valve rod, constantly absorbing heat from the valve head and passing it to the valve rod, and then passing it to the cylinder head through the valve guide, so that the valve head is cooled.