This invention provides a vehicle air supply
system and a vehicle pressure reducing valve. The vehicle air supply
system adopts a high-pressure dryer and a back-blowing pipeline structure, which can regenerate the dryer by back-blowing and recover high-pressure gas to a low-pressure
storage tank, reducing
energy consumption. The vehicle pressure reducing valve in the
system includes a body, a primary pressure reducing mechanism, and a secondary pressure reducing mechanism. The body is equipped with a vent, a supply channel, and a
transmission channel. The secondary pressure reducing mechanism contains a secondary pressure regulating spring, a secondary return spring, a pressure relief groove, and a secondary valve core, which can realize step-by-step
pressure reduction and stabilization of gas, and automatically release pressure when
overpressure occurs to protect the gas-using components. It has
high pressure regulation accuracy and stable and reliable operation. In conjunction with the vehicle air supply system, it can simultaneously meet the gas demand of the high-pressure
air spring and the low-pressure gas-using unit. The system has high integration, good
drying effect, safety and stability, and significantly improved applicability and service life.