The casting adopts the German film covered Sand casting technology, with a flat surface and a finish of 12.5~25 microns. At the same time, the mechanical properties of the castings are good, with over 98% free from defects such as pores, sand holes, and cracks, and the effective wall thickness meets the standard.

The valve adopts a conical seal, with no residual impurities on the sealing surface. When it tends to close, the sealing surface has a self-cleaning effect. The conical sealing surface can amplify the axial force of the valve stem when converted into sealing force, resulting in better sealing performance.