This part of GB/T 9766 specifies the terms and definitions, test equipment, instrumentation, test plate, hole size, tightness test, assembly torque test of hexagon nut and mouth body or mouth seat for compression tubeless valve test , Corrosion resistance test. This part is applicable to the test of tire valves for motorcycles, cars, light trucks, trucks and passenger cars. This section does not apply to the test of aviation tire valves.