Requirements for pipeline ball valves in long-distance pipelines

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Since long-distance pipelines are part of a globalized industry and serve as energy supply lines, they extend from south to north, from mountains to the seabed, from plateaus to deserts, passing through various complex environments along the way. Some are installed, while others are buried directly underground; they are operated in the field, making maintenance difficult, and are required to have a service life of 30 years. Generally used for transporting crude oil and natural gas, these fluids are sulfur-containing, contain rust and metal particles despite being processed, and require zero-leakage sealing. Given the harsh operating conditions and the importance of energy supply lines, strict technical requirements are imposed on pipeline ball valves. Roughly, there are ten such requirements. 1) Exhaustion 　　The medium in the valve chamber can be exhausted ； And online seal testing of the valve is carried out through this exhaust port. 2) Emergency shut-off function: Long-distance pipeline transmission systems employ a satellite monitoring system; when the pressure drop rate or duration in the pipeline reaches a certain set value, the valve should be activated for emergency shut-off ； 3) Possesses fire safety and anti-static functions ； The design of pipeline ball valves must take firesafe considerations into account; in the event of a fire, the external and internal leaks from the valve must not exceed the leakage standards specified by API607 ； When the sphere is held by non-metallic materials, static electricity may be generated; it must be in electrical contact with the valve body. At 24VDC, the resistance value is