Key, special process control, determines whether the final product quality can meet customer requirements. Cryogenic treatment, pressure test, low temperature test is the key control links, heat treatment, welding is a special control link.

1. Cryogenic treatment keeps the final product stable at low temperatures.

2.100% of the pressure test to verify the strength and sealing performance of products, low-temperature test is a prerequisite.

3. According to enterprise standards for low temperature test, verify the valve at low temperature sealing performance.