The top cover of the valve shows the practicality of the structural design and the details of the process. The main body adopts the integral molding casting process, and the surface presents a uniform metal texture without obvious sand eyes or bubbles, indicating that the material has high density and excellent pressure resistance. The connection between the top ring handle and the base has been rounded, which not only enhances the load-bearing strength, but also avoids the risk of fracture caused by stress concentration. The inner wall of the central through hole is smooth and burr-free, which is convenient for accurate cooperation with the valve stem and reduces the resistance and leakage hazards during fluid transportation. The overall shape is simple and stable, and the bottom round flange design increases the contact area with the valve body, which can be fixed evenly by bolts to improve the sealing performance.