Oil pipeline is not only an energy supply line, but also a lifeline related to economic development and people's livelihood security. Valve is one of the main equipment in pipeline industry. It plays a key role in safe and reliable operation in pipeline transportation. General speaking ,although crude oil and natural gas are processed, still contains sulphur, rust and metal particles, and it requires zero-grade sealing. The harsh environment and the importance of energy supply lines in actual use put forward strict technical requirements for pipeline ball valves.