EGR Valve (Exhaust Gas Recirculation)

1.Product Introduction

The EGR valve is a mechatronic product installed on a diesel engine to control the amount of exhaust gas recirculation fed back to the intake system. It’s usually on the right side of the intake manifold, near the throttle body, and has a short metal tube leading to the exhaust manifold connected to it. Its function is to control the amount of exhaust gas entering the intake manifold, so that a certain amount of exhaust gas flows into the intake manifold for recirculation. The EGR valve is a very important and key component in the exhaust gas recirculation device.

It is used in a variety of applications, including passenger cars, commercial vehicles, and industrial engines.

There are two types of EGR valves: mechanical and electronic.

The EGR valve guides the exhaust gas discharged from the engine combustion to the intake manifold to participate in the combustion to reduce the temperature of the combustion chamber, improve the working efficiency of the engine, improve the combustion environment, and reduce the burden on the engine, effectively reducing the emission of NO compounds, reducing knocking, and extending the length of each component. service life

The full name is Exhaust Gas Recirculation, that is, the exhaust gas recirculation system is used to reduce the emission of nitrogen oxides (NOx) in the exhaust gas. Nitrogen and oxygen can only react chemically under the conditions of high temperature and high pressure. The temperature and pressure in the combustion chamber of the engine meet the above conditions, especially during forced acceleration. When the engine is running under load, the EGR valve opens, allowing a small amount of exhaust gas to enter the intake manifold and enter the combustion chamber together with the combustible mixture. With the EGR valve closed at idle, little exhaust gas is recirculated to the engine. Automobile exhaust gas is a non-combustible gas (without fuel and oxidant), which does not participate in combustion in the combustion chamber. It reduces the combustion temperature and pressure by absorbing part of the heat generated by combustion to reduce the generation of nitrogen oxides. The amount of exhaust gas entering the combustion chamber increases with engine speed and load

Exhaust gas recirculation is a method of introducing part of the exhaust gas to the inhaled fresh air (or mixed gas) during the working process of the engine, and returning it to the cylinder for recirculation to participate in combustion. Its function is to reduce NOx emissions. NOx is a gas that is extremely harmful to the human body, and it is mainly generated under the condition of high temperature and rich oxygen. During the working process of the engine, if part of the exhaust gas is reintroduced into the cylinder in a timely and appropriate amount, because the main component in the exhaust gas, CO2, has a relatively large specific heat capacity, so the exhaust gas can absorb part of the heat generated by combustion and take it out of the cylinder, and has an effect on the mixture. A certain dilution effect, thus reducing the maximum temperature and oxygen content of engine combustion, thereby reducing the formation of NOx compounds.

2.Product Model List