Valve is one of the widely used drives in automobiles, and it mainly has the following functions:

1. AC Expansion Valve: Sometimes referred to as a **conversion valve** in certain vehicle systems. Regulates the flow of refrigerant into the evaporator to control cooling. Ensures efficient temperature control and prevents freezing of the evaporator.
2. Brake Proportioning Valve: Helps adjust brake fluid pressure between front and rear brakes. Important when converting drum brakes to disc brakes.
3. Transmission Valve: Controls hydraulic pressure for smooth shifting in an automatic transmission. Can be modified or replaced during manual-to-automatic transmission conversion.

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