The main function of the sealing ring of the automotive expansion valve is to seal the medium and prevent the coolant from leaking inside the expansion valve. Since automotive engines generate high temperatures and pressures during operation, the seals need to be able to withstand these extreme conditions to ensure the sealing and integrity of the cooling system. At the same time, the sealing ring also plays a role in cushioning and damping, reducing the vibration and noise during the operation of the expansion valve
