EGR valves

EGR valves are devices used in cars to reduce nitrogen oxide (NOx) emissions, which are polluting and harmful to health and the environment. These valves recirculate part of the exhaust gases into the intake, thereby reducing the temperature and oxygen in the combustion chamber. This results in more efficient combustion that generates less NOx.

EGR valves were first used in the United States in the 1970s, and have been mandatory in Europe since 1996 under Euro 2 regulations. They are used in both diesel and gasoline engines, although they are more common and larger in the former. Their operation depends on several sensors that measure engine temperature, engine speed and acceleration load. This data is sent to the engine control unit (ECU), which opens or closes the EGR valve depending on driving conditions.

EGR valves can fail due to blockage caused by the build-up of carbon, which is the residue of incomplete fuel combustion. This can cause loss of power, jerking, increased fuel consumption and the emission of very harmful gases. To avoid this, it is recommended to drive at high engine speeds and in low gears from time to time, and to clean the EGR valve periodically with specific products or with the help of a professional.

Some of the major EGR valve manufacturers are:

- Bosch : Bosch is a leading German company in the automotive sector, offering innovative and technological solutions to improve the performance and sustainability of vehicles. Bosch manufactures electronic and pneumatic EGR valves, which adapt to the different needs of diesel and gasoline engines.

- Delphi Delphi is an American company dedicated to the design and manufacture of components and systems for the automotive industry. Delphi produces high-precision and durable EGR valves that optimize exhaust gas flow control and fuel consumption.

- Denso: A Japanese company specialising in the development and production of parts and equipment for the automotive sector. Denso offers compact and lightweight EGR valves, which incorporate sensors and actuators to regulate the recirculation of exhaust gases in an efficient and safe manner.