Inspection items include:
1. Whether there are sand holes, cracks and other defects on the inner and outer surfaces of the alloy valve body;
2. Whether the valve seat is firmly connected with the alloy valve body, whether the valve core is consistent with the valve seat, and whether the sealing surface is defective;
3. Whether the connection between the valve rod and the valve core is flexible and reliable, whether the valve rod is bent, and whether the thread is damaged and corroded;
4. Whether the packing and gasket are aging and damaged;
5. Whether the valve can be opened flexibly, etc.
