![]() On the other hand, martensitic steel offers high resistance to wear and tensile loading. The austenitic steel offers Corrosion resistance and temperature resistance which is important for the conditions inside the cylinder block. The mechanical properties of each of These materials serve important purposes. Generally, austenitic steel is used for the valve head and martensitic steel is used for the stem. And then they are welded by friction welding. In a Bimetallic engine valve, the head and the stem are fabricated individually. Chromium, manganese, stainless steel can be used for making these exhaust valves. They have excellent metallic properties and are resistant to Corrosion. They have high thermal resistance as well as great anti frictional qualities. Types of Poppet valves based on the Fabrication technique:īased on the fabrication of the valves the poppet valves are divided into 3 parts.Īs the name suggests a Monometallic engine valve is made up of similar material from stem to the head. Margin is the largest diameter of the valve and the combustion face is situated inside the cylinder which faces the combustion reactions inside the cylinder. The fillet is followed by the seat face which fits into the port to block the flow of the substance. The head consists of a fillet which is designed according to the port of the engine. Below the tip is provided with a keeper groove. The top of the stem is called a tip which is always in contact with the camshaft. The valve structure is divided into two parts, the upper one is called the stem and the lower one is called the head. The basic structure or a poppet valve is given below: Nowadays the engine uses a poppet-type valve due to its up and down motion which closes and opens the valve respectively. Structure or Parts of a Modern Engine Valve: The structure and details of the poppet valve are given below. There are very few chances of fuel leaks in the case of poppet valves. The up-down motion of poppet valves is ideal for IC engines. ![]() The simple design makes it operational under various conditions. The poppet valve is the most effective and widely used in internal combustion engines. These types of valves have a simple construction and produce less noise. Then the inlet port of the sleeve and the inlet port of the cylinder coincide the fuel enters the combustion chamber and when the exhaust port of the sleeve and exhaust port of the cylinder coincide, the exhaust gases vent out of the cylinder. The sleeve gets its vertical and rotational motion from the crankshaft of the engine. This sleeve has two-day ports in it for inlet of fuel and outlet of exhaust gases and the same is the case with the cylinder. We will study one by one in detail, Sleeve valve:Ī sleeve valve consists of a sliding tube-like structure between the piston and the cylinder valve. There are four types of valves in an internal combustion engine: What are different Types of Engine Valves? ![]() The main function of the Exhaust valve is to deliver the fuel charged to the engine and allows fresh fuel to come into the combustion chamber. These materials have good heat resistance. ![]() Here the temperature of the fuel is much high therefore we use material here is steel alloy of silicon and chromium. When it gets closed it seals the combustion chamber tightly and therefore it restricts another fuel to come in. In the starting the temperature of the mixture is low. Through the Inlet valve, the mixture enters into the cylinder. The Inlet valve is made up of nickel-chromium alloy steel.
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