Principles of using ball valves

1. For oil and natural gas pipelines, pipelines that need to be cleaned, and buried in the ground, use all-pass and all-welded ball valves; for buried on the ground, select all-pass welded or flanged ball valves ; Branch pipes, select flange connection, welding connection, all-through or reduced diameter ball valve.
2. For the transportation pipeline and storage equipment of refined oil, use flanged ball valves.
3. Floating ball valves with flange connection and internal thread connection are used on city gas and natural gas pipelines.
4. In the oxygen pipeline system in the metallurgical system, a fixed ball valve that has undergone strict degreasing treatment and flanged connection should be used.
5. For the piping system and device of low temperature medium, low temperature ball valve with bonnet should be used.
6. In the pipeline system of the catalytic cracking unit of the oil refining unit, a lifter rod ball valve can be used. 
7. All stainless steel ball valves made of austenitic stainless steel and PTFE as the seat seal ring should be used in the equipment and piping systems of corrosive media such as acid and alkali in the chemical system.  
8. Metal-to-metal sealing ball valves can be used on pipeline systems or devices for high-temperature media in metallurgical systems, power systems, petrochemical plants, and urban heating systems. 
9. When flow adjustment is required, a worm gear driven, pneumatic or electric regulating ball valve with V -shaped opening can be selected.