All valves purchased on site have product model specifications, and the standard number (national standard, industry standard or enterprise standard) of the product can be found according to the model. In this product standard, it will be stipulated that the product production must pass the type inspection and issue the type inspection report. The standard will specify the validity period of the type inspection report (such as 6 months, 3 years and 5 years).

The product standard also stipulates the ex-factory inspection of products (generally, ex-factory inspection is less than type inspection).

Users of these inspection reports have the right to request manufacturers to provide these reports. If they can't provide it, it means there may be something wrong with the product.