1. The valve body is formed by casting or Pressure Casting, and its marking is cast or pressure-cast on the valve body at the same time as the valve body.

2. When the shape of the valve body is formed by die forging, in addition to die forging or pressure-casting at the same time as the valve body, its marking can also be marked on the valve body by stamping. When the shape of the valve body is processed by forgings, and the steel pipe or steel plate is rolled and formed, in addition to the method of stamping, other methods that do not affect the performance of the valve body can also be used.

3. The information of the mark usually includes the nominal size, the pressure or the working pressure and the flow direction mark. The nominal size is marked above the pressure code.