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At the expansion valve of a car it is about a so-called throttle body.

This has the function to control the expansion in the evaporator so that no, or minimal refrigerant remains.

So it also protects the compressor of a vehicle.

Function and structure of an expansion valve

In combustion installations, such as in an engine heat is spreading. In this process, the energy is transferred to other areas of the car, without the need for additional energy through the use of additional fuel. The expansion valve in this area has the function to open up the space in which the expansion takes place and to close back. The expansion valve of a car is regulated by various sensors and a control unit, so that the pressure can be optimally distributed. This energy then ensures for the cooling of the aspirated air. The expansion valve that stand in front of the evaporator and the compressor remains open until sufficiently pressure has built up so that a cooling liquid is formed from the gas. In the evaporator is from the cooling liquid then obtained a gas which is put under pressure and is liquefied in the compressor. This happens because the setting was regulated at the expansion valve so that the individual pressure to be distributed optimally, so that this energy is used for cooling the intake air.

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