The main purpose of the valve is to open or close the inlet or outlet hole, which is located in the cylinder head (overhead valve) or in the cylinder blocks (L head mechanism). Exhaust valve consists of two components - the head and the rod. Exhaust valve fulfils just two functions. First, it must well perform an insulating function of the cylinder during the compression and combustion strokes both of the intake and the exhaust pipe. Second, when the valve is open, it provides the least possible resistance to the movement of gases. It is also worth noting that the resistance decrease when gases flow the valve, provides a smooth passing from the head to the rod.

Along with other parts of the gas distribution mechanism, such as a rod or tappet, the exhaust valve must be light. This is because of the fact that when the reciprocating motion, there should not occur a large inertia force. As for a tight fit of the parts directly to the saddle, on the lower side of the exhaust valve head there is a chamfer at an angle of 45 ° or at an angle of 30 °, which is obligatory grinded. In car engines the most commonly used exhaust valves are the valves with flat or tulip heads. Valves with flat heads are lighter and their heating surface is smaller.

If you have any problems with the failed parts of the gas distribution mechanism, do not give way to despair! Before you decide to go to the service centre to replace the parts, visit our online store to purchase the necessary original spare part at a reasonable price. Regardless of whether you need a timing belt, toothed wheel or a middle silencer, you can always find the right auto parts in our vast catalogue. Moreover, sometimes garages may not have the parts you need and you need to wait a few weeks until they get it.