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